parent
78a3069f82
commit
f72ee26927
libc
@ -500,10 +500,13 @@ endif # mips
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libc_common_cflags := \
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-DWITH_ERRLIST \
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-DANDROID_CHANGES \
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-DUSE_LOCKS \
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-DREALLOC_ZERO_BYTES_FREES \
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-D_LIBC=1 \
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-DFLOATING_POINT \
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-DINET6 \
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-I$(LOCAL_PATH)/private \
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-DUSE_DL_PREFIX \
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-DPOSIX_MISTAKE \
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-DLOG_ON_HEAP_ERROR \
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-std=gnu99
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File diff suppressed because it is too large
Load Diff
@ -1,34 +1,655 @@
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/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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Default header file for malloc-2.8.x, written by Doug Lea
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and released to the public domain, as explained at
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http://creativecommons.org/licenses/publicdomain.
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last update: Mon Aug 15 08:55:52 2005 Doug Lea (dl at gee)
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This header is for ANSI C/C++ only. You can set any of
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the following #defines before including:
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* If USE_DL_PREFIX is defined, it is assumed that malloc.c
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was also compiled with this option, so all routines
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have names starting with "dl".
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* If HAVE_USR_INCLUDE_MALLOC_H is defined, it is assumed that this
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file will be #included AFTER <malloc.h>. This is needed only if
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your system defines a struct mallinfo that is incompatible with the
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standard one declared here. Otherwise, you can include this file
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INSTEAD of your system system <malloc.h>. At least on ANSI, all
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declarations should be compatible with system versions
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* If MSPACES is defined, declarations for mspace versions are included.
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*/
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#ifndef MALLOC_280_H
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#define MALLOC_280_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stddef.h> /* for size_t */
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#if !ONLY_MSPACES
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/* Check an additional macro for the five primary functions */
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#if !defined(USE_DL_PREFIX)
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#define dlcalloc calloc
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#define dlfree free
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#define dlmalloc malloc
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#define dlmemalign memalign
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#define dlrealloc realloc
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#endif
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#ifndef USE_DL_PREFIX
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#define dlvalloc valloc
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#define dlpvalloc pvalloc
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#define dlmallinfo mallinfo
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#define dlmallopt mallopt
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#define dlmalloc_trim malloc_trim
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#define dlmalloc_walk_free_pages \
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malloc_walk_free_pages
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#define dlmalloc_walk_heap \
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malloc_walk_heap
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#define dlmalloc_stats malloc_stats
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#define dlmalloc_usable_size malloc_usable_size
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#define dlmalloc_footprint malloc_footprint
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#define dlmalloc_max_allowed_footprint \
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malloc_max_allowed_footprint
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#define dlmalloc_set_max_allowed_footprint \
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malloc_set_max_allowed_footprint
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#define dlmalloc_max_footprint malloc_max_footprint
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#define dlindependent_calloc independent_calloc
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#define dlindependent_comalloc independent_comalloc
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#endif /* USE_DL_PREFIX */
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/*
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malloc(size_t n)
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Returns a pointer to a newly allocated chunk of at least n bytes, or
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null if no space is available, in which case errno is set to ENOMEM
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on ANSI C systems.
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If n is zero, malloc returns a minimum-sized chunk. (The minimum
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size is 16 bytes on most 32bit systems, and 32 bytes on 64bit
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systems.) Note that size_t is an unsigned type, so calls with
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arguments that would be negative if signed are interpreted as
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requests for huge amounts of space, which will often fail. The
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maximum supported value of n differs across systems, but is in all
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cases less than the maximum representable value of a size_t.
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*/
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void* dlmalloc(size_t);
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/*
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free(void* p)
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Releases the chunk of memory pointed to by p, that had been previously
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allocated using malloc or a related routine such as realloc.
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It has no effect if p is null. If p was not malloced or already
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freed, free(p) will by default cuase the current program to abort.
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*/
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void dlfree(void*);
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/*
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calloc(size_t n_elements, size_t element_size);
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Returns a pointer to n_elements * element_size bytes, with all locations
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set to zero.
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*/
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void* dlcalloc(size_t, size_t);
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/*
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realloc(void* p, size_t n)
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Returns a pointer to a chunk of size n that contains the same data
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as does chunk p up to the minimum of (n, p's size) bytes, or null
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if no space is available.
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The returned pointer may or may not be the same as p. The algorithm
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prefers extending p in most cases when possible, otherwise it
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employs the equivalent of a malloc-copy-free sequence.
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If p is null, realloc is equivalent to malloc.
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If space is not available, realloc returns null, errno is set (if on
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ANSI) and p is NOT freed.
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if n is for fewer bytes than already held by p, the newly unused
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space is lopped off and freed if possible. realloc with a size
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argument of zero (re)allocates a minimum-sized chunk.
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The old unix realloc convention of allowing the last-free'd chunk
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to be used as an argument to realloc is not supported.
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*/
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void* dlrealloc(void*, size_t);
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/*
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memalign(size_t alignment, size_t n);
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Returns a pointer to a newly allocated chunk of n bytes, aligned
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in accord with the alignment argument.
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The alignment argument should be a power of two. If the argument is
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not a power of two, the nearest greater power is used.
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8-byte alignment is guaranteed by normal malloc calls, so don't
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bother calling memalign with an argument of 8 or less.
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Overreliance on memalign is a sure way to fragment space.
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*/
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void* dlmemalign(size_t, size_t);
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/*
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valloc(size_t n);
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Equivalent to memalign(pagesize, n), where pagesize is the page
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size of the system. If the pagesize is unknown, 4096 is used.
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*/
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void* dlvalloc(size_t);
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/*
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mallopt(int parameter_number, int parameter_value)
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Sets tunable parameters The format is to provide a
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(parameter-number, parameter-value) pair. mallopt then sets the
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corresponding parameter to the argument value if it can (i.e., so
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long as the value is meaningful), and returns 1 if successful else
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0. SVID/XPG/ANSI defines four standard param numbers for mallopt,
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normally defined in malloc.h. None of these are use in this malloc,
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so setting them has no effect. But this malloc also supports other
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options in mallopt:
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Symbol param # default allowed param values
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M_TRIM_THRESHOLD -1 2*1024*1024 any (-1U disables trimming)
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M_GRANULARITY -2 page size any power of 2 >= page size
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M_MMAP_THRESHOLD -3 256*1024 any (or 0 if no MMAP support)
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*/
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int dlmallopt(int, int);
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#define M_TRIM_THRESHOLD (-1)
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#define M_GRANULARITY (-2)
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#define M_MMAP_THRESHOLD (-3)
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/*
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malloc_footprint();
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Returns the number of bytes obtained from the system. The total
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number of bytes allocated by malloc, realloc etc., is less than this
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value. Unlike mallinfo, this function returns only a precomputed
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result, so can be called frequently to monitor memory consumption.
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Even if locks are otherwise defined, this function does not use them,
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so results might not be up to date.
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*/
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size_t dlmalloc_footprint();
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/*
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malloc_max_allowed_footprint();
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Returns the number of bytes that the heap is allowed to obtain
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from the system. malloc_footprint() should always return a
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size less than or equal to max_allowed_footprint, unless the
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max_allowed_footprint was set to a value smaller than the
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footprint at the time.
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This function is only available if dlmalloc.c was compiled
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with USE_MAX_ALLOWED_FOOTPRINT set.
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*/
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size_t dlmalloc_max_allowed_footprint();
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/*
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malloc_set_max_allowed_footprint();
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Set the maximum number of bytes that the heap is allowed to
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obtain from the system. The size will be rounded up to a whole
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page, and the rounded number will be returned from future calls
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to malloc_max_allowed_footprint(). If the new max_allowed_footprint
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is larger than the current footprint, the heap will never grow
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larger than max_allowed_footprint. If the new max_allowed_footprint
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is smaller than the current footprint, the heap will not grow
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further.
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This function is only available if dlmalloc.c was compiled
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with USE_MAX_ALLOWED_FOOTPRINT set.
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TODO: try to force the heap to give up memory in the shrink case,
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and update this comment once that happens.
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*/
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void dlmalloc_set_max_allowed_footprint(size_t bytes);
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/*
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malloc_max_footprint();
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Returns the maximum number of bytes obtained from the system. This
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value will be greater than current footprint if deallocated space
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has been reclaimed by the system. The peak number of bytes allocated
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by malloc, realloc etc., is less than this value. Unlike mallinfo,
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this function returns only a precomputed result, so can be called
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frequently to monitor memory consumption. Even if locks are
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otherwise defined, this function does not use them, so results might
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not be up to date.
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*/
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size_t dlmalloc_max_footprint(void);
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#if !NO_MALLINFO
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/*
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mallinfo()
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Returns (by copy) a struct containing various summary statistics:
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arena: current total non-mmapped bytes allocated from system
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ordblks: the number of free chunks
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smblks: always zero.
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hblks: current number of mmapped regions
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hblkhd: total bytes held in mmapped regions
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usmblks: the maximum total allocated space. This will be greater
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than current total if trimming has occurred.
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fsmblks: always zero
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uordblks: current total allocated space (normal or mmapped)
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fordblks: total free space
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keepcost: the maximum number of bytes that could ideally be released
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back to system via malloc_trim. ("ideally" means that
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it ignores page restrictions etc.)
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Because these fields are ints, but internal bookkeeping may
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be kept as longs, the reported values may wrap around zero and
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thus be inaccurate.
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*/
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#ifndef HAVE_USR_INCLUDE_MALLOC_H
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#ifndef _MALLOC_H_
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#ifndef MALLINFO_FIELD_TYPE
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#define MALLINFO_FIELD_TYPE size_t
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#endif /* MALLINFO_FIELD_TYPE */
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struct mallinfo {
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MALLINFO_FIELD_TYPE arena; /* non-mmapped space allocated from system */
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MALLINFO_FIELD_TYPE ordblks; /* number of free chunks */
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MALLINFO_FIELD_TYPE smblks; /* always 0 */
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MALLINFO_FIELD_TYPE hblks; /* always 0 */
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MALLINFO_FIELD_TYPE hblkhd; /* space in mmapped regions */
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MALLINFO_FIELD_TYPE usmblks; /* maximum total allocated space */
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MALLINFO_FIELD_TYPE fsmblks; /* always 0 */
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MALLINFO_FIELD_TYPE uordblks; /* total allocated space */
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MALLINFO_FIELD_TYPE fordblks; /* total free space */
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MALLINFO_FIELD_TYPE keepcost; /* releasable (via malloc_trim) space */
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};
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#endif /* _MALLOC_H_ */
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#endif /* HAVE_USR_INCLUDE_MALLOC_H */
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struct mallinfo dlmallinfo(void);
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#endif /* NO_MALLINFO */
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/*
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independent_calloc(size_t n_elements, size_t element_size, void* chunks[]);
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independent_calloc is similar to calloc, but instead of returning a
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single cleared space, it returns an array of pointers to n_elements
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independent elements that can hold contents of size elem_size, each
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of which starts out cleared, and can be independently freed,
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realloc'ed etc. The elements are guaranteed to be adjacently
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allocated (this is not guaranteed to occur with multiple callocs or
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mallocs), which may also improve cache locality in some
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applications.
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The "chunks" argument is optional (i.e., may be null, which is
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probably the most typical usage). If it is null, the returned array
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is itself dynamically allocated and should also be freed when it is
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no longer needed. Otherwise, the chunks array must be of at least
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n_elements in length. It is filled in with the pointers to the
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chunks.
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In either case, independent_calloc returns this pointer array, or
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null if the allocation failed. If n_elements is zero and "chunks"
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is null, it returns a chunk representing an array with zero elements
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(which should be freed if not wanted).
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Each element must be individually freed when it is no longer
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needed. If you'd like to instead be able to free all at once, you
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should instead use regular calloc and assign pointers into this
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space to represent elements. (In this case though, you cannot
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independently free elements.)
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independent_calloc simplifies and speeds up implementations of many
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kinds of pools. It may also be useful when constructing large data
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structures that initially have a fixed number of fixed-sized nodes,
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but the number is not known at compile time, and some of the nodes
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may later need to be freed. For example:
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struct Node { int item; struct Node* next; };
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struct Node* build_list() {
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struct Node** pool;
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int n = read_number_of_nodes_needed();
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if (n <= 0) return 0;
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pool = (struct Node**)(independent_calloc(n, sizeof(struct Node), 0);
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if (pool == 0) die();
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// organize into a linked list...
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struct Node* first = pool[0];
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for (i = 0; i < n-1; ++i)
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pool[i]->next = pool[i+1];
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free(pool); // Can now free the array (or not, if it is needed later)
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return first;
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}
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*/
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void** dlindependent_calloc(size_t, size_t, void**);
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/*
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independent_comalloc(size_t n_elements, size_t sizes[], void* chunks[]);
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independent_comalloc allocates, all at once, a set of n_elements
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chunks with sizes indicated in the "sizes" array. It returns
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an array of pointers to these elements, each of which can be
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independently freed, realloc'ed etc. The elements are guaranteed to
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be adjacently allocated (this is not guaranteed to occur with
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multiple callocs or mallocs), which may also improve cache locality
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in some applications.
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The "chunks" argument is optional (i.e., may be null). If it is null
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the returned array is itself dynamically allocated and should also
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be freed when it is no longer needed. Otherwise, the chunks array
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must be of at least n_elements in length. It is filled in with the
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pointers to the chunks.
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In either case, independent_comalloc returns this pointer array, or
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null if the allocation failed. If n_elements is zero and chunks is
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null, it returns a chunk representing an array with zero elements
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(which should be freed if not wanted).
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Each element must be individually freed when it is no longer
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needed. If you'd like to instead be able to free all at once, you
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should instead use a single regular malloc, and assign pointers at
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particular offsets in the aggregate space. (In this case though, you
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cannot independently free elements.)
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independent_comallac differs from independent_calloc in that each
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element may have a different size, and also that it does not
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automatically clear elements.
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independent_comalloc can be used to speed up allocation in cases
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where several structs or objects must always be allocated at the
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same time. For example:
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struct Head { ... }
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struct Foot { ... }
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void send_message(char* msg) {
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int msglen = strlen(msg);
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size_t sizes[3] = { sizeof(struct Head), msglen, sizeof(struct Foot) };
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void* chunks[3];
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if (independent_comalloc(3, sizes, chunks) == 0)
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die();
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struct Head* head = (struct Head*)(chunks[0]);
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char* body = (char*)(chunks[1]);
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struct Foot* foot = (struct Foot*)(chunks[2]);
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// ...
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}
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In general though, independent_comalloc is worth using only for
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larger values of n_elements. For small values, you probably won't
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detect enough difference from series of malloc calls to bother.
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Overuse of independent_comalloc can increase overall memory usage,
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since it cannot reuse existing noncontiguous small chunks that
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might be available for some of the elements.
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*/
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void** dlindependent_comalloc(size_t, size_t*, void**);
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/*
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pvalloc(size_t n);
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Equivalent to valloc(minimum-page-that-holds(n)), that is,
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round up n to nearest pagesize.
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*/
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void* dlpvalloc(size_t);
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#ifndef LIBC_BIONIC_DLMALLOC_H_
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#define LIBC_BIONIC_DLMALLOC_H_
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/*
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malloc_trim(size_t pad);
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/* Configure dlmalloc. */
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#define HAVE_GETPAGESIZE 1
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#define MALLOC_INSPECT_ALL 1
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#define MORECORE_CONTIGUOUS 0
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#define MSPACES 0
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#define REALLOC_ZERO_BYTES_FREES 1
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#define USE_DL_PREFIX 1
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#define USE_LOCKS 1
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#define USE_RECURSIVE_LOCK 0
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#define USE_SPIN_LOCKS 0
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If possible, gives memory back to the system (via negative arguments
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to sbrk) if there is unused memory at the `high' end of the malloc
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||||
pool or in unused MMAP segments. You can call this after freeing
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large blocks of memory to potentially reduce the system-level memory
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||||
requirements of a program. However, it cannot guarantee to reduce
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||||
memory. Under some allocation patterns, some large free blocks of
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memory will be locked between two used chunks, so they cannot be
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given back to the system.
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/* Include the proper definitions. */
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#include "../upstream-dlmalloc/malloc.h"
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The `pad' argument to malloc_trim represents the amount of free
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trailing space to leave untrimmed. If this argument is zero, only
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||||
the minimum amount of memory to maintain internal data structures
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||||
will be left. Non-zero arguments can be supplied to maintain enough
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||||
trailing space to service future expected allocations without having
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to re-obtain memory from the system.
|
||||
|
||||
#endif // LIBC_BIONIC_DLMALLOC_H_
|
||||
Malloc_trim returns 1 if it actually released any memory, else 0.
|
||||
*/
|
||||
int dlmalloc_trim(size_t);
|
||||
|
||||
/*
|
||||
malloc_walk_free_pages(handler, harg)
|
||||
|
||||
Calls the provided handler on each free region in the heap. The
|
||||
memory between start and end are guaranteed not to contain any
|
||||
important data, so the handler is free to alter the contents
|
||||
in any way. This can be used to advise the OS that large free
|
||||
regions may be swapped out.
|
||||
|
||||
The value in harg will be passed to each call of the handler.
|
||||
*/
|
||||
void dlmalloc_walk_free_pages(void(*handler)(void *start, void *end, void *arg),
|
||||
void *harg);
|
||||
|
||||
/*
|
||||
malloc_walk_heap(handler, harg)
|
||||
|
||||
Calls the provided handler on each object or free region in the
|
||||
heap. The handler will receive the chunk pointer and length, the
|
||||
object pointer and length, and the value in harg on each call.
|
||||
*/
|
||||
void dlmalloc_walk_heap(void(*handler)(const void *chunkptr, size_t chunklen,
|
||||
const void *userptr, size_t userlen,
|
||||
void *arg),
|
||||
void *harg);
|
||||
|
||||
/*
|
||||
malloc_usable_size(void* p);
|
||||
|
||||
Returns the number of bytes you can actually use in
|
||||
an allocated chunk, which may be more than you requested (although
|
||||
often not) due to alignment and minimum size constraints.
|
||||
You can use this many bytes without worrying about
|
||||
overwriting other allocated objects. This is not a particularly great
|
||||
programming practice. malloc_usable_size can be more useful in
|
||||
debugging and assertions, for example:
|
||||
|
||||
p = malloc(n);
|
||||
assert(malloc_usable_size(p) >= 256);
|
||||
*/
|
||||
size_t dlmalloc_usable_size(void*);
|
||||
|
||||
/*
|
||||
malloc_stats();
|
||||
Prints on stderr the amount of space obtained from the system (both
|
||||
via sbrk and mmap), the maximum amount (which may be more than
|
||||
current if malloc_trim and/or munmap got called), and the current
|
||||
number of bytes allocated via malloc (or realloc, etc) but not yet
|
||||
freed. Note that this is the number of bytes allocated, not the
|
||||
number requested. It will be larger than the number requested
|
||||
because of alignment and bookkeeping overhead. Because it includes
|
||||
alignment wastage as being in use, this figure may be greater than
|
||||
zero even when no user-level chunks are allocated.
|
||||
|
||||
The reported current and maximum system memory can be inaccurate if
|
||||
a program makes other calls to system memory allocation functions
|
||||
(normally sbrk) outside of malloc.
|
||||
|
||||
malloc_stats prints only the most commonly interesting statistics.
|
||||
More information can be obtained by calling mallinfo.
|
||||
*/
|
||||
void dlmalloc_stats();
|
||||
|
||||
#endif /* !ONLY_MSPACES */
|
||||
|
||||
#if MSPACES
|
||||
|
||||
/*
|
||||
mspace is an opaque type representing an independent
|
||||
region of space that supports mspace_malloc, etc.
|
||||
*/
|
||||
typedef void* mspace;
|
||||
|
||||
/*
|
||||
create_mspace creates and returns a new independent space with the
|
||||
given initial capacity, or, if 0, the default granularity size. It
|
||||
returns null if there is no system memory available to create the
|
||||
space. If argument locked is non-zero, the space uses a separate
|
||||
lock to control access. The capacity of the space will grow
|
||||
dynamically as needed to service mspace_malloc requests. You can
|
||||
control the sizes of incremental increases of this space by
|
||||
compiling with a different DEFAULT_GRANULARITY or dynamically
|
||||
setting with mallopt(M_GRANULARITY, value).
|
||||
*/
|
||||
mspace create_mspace(size_t capacity, int locked);
|
||||
|
||||
/*
|
||||
destroy_mspace destroys the given space, and attempts to return all
|
||||
of its memory back to the system, returning the total number of
|
||||
bytes freed. After destruction, the results of access to all memory
|
||||
used by the space become undefined.
|
||||
*/
|
||||
size_t destroy_mspace(mspace msp);
|
||||
|
||||
/*
|
||||
create_mspace_with_base uses the memory supplied as the initial base
|
||||
of a new mspace. Part (less than 128*sizeof(size_t) bytes) of this
|
||||
space is used for bookkeeping, so the capacity must be at least this
|
||||
large. (Otherwise 0 is returned.) When this initial space is
|
||||
exhausted, additional memory will be obtained from the system.
|
||||
Destroying this space will deallocate all additionally allocated
|
||||
space (if possible) but not the initial base.
|
||||
*/
|
||||
mspace create_mspace_with_base(void* base, size_t capacity, int locked);
|
||||
|
||||
/*
|
||||
mspace_malloc behaves as malloc, but operates within
|
||||
the given space.
|
||||
*/
|
||||
void* mspace_malloc(mspace msp, size_t bytes);
|
||||
|
||||
/*
|
||||
mspace_free behaves as free, but operates within
|
||||
the given space.
|
||||
|
||||
If compiled with FOOTERS==1, mspace_free is not actually needed.
|
||||
free may be called instead of mspace_free because freed chunks from
|
||||
any space are handled by their originating spaces.
|
||||
*/
|
||||
void mspace_free(mspace msp, void* mem);
|
||||
|
||||
/*
|
||||
mspace_realloc behaves as realloc, but operates within
|
||||
the given space.
|
||||
|
||||
If compiled with FOOTERS==1, mspace_realloc is not actually
|
||||
needed. realloc may be called instead of mspace_realloc because
|
||||
realloced chunks from any space are handled by their originating
|
||||
spaces.
|
||||
*/
|
||||
void* mspace_realloc(mspace msp, void* mem, size_t newsize);
|
||||
|
||||
/*
|
||||
mspace_merge_objects will merge allocated memory mema and memb
|
||||
together, provided memb immediately follows mema. It is roughly as
|
||||
if memb has been freed and mema has been realloced to a larger size.
|
||||
On successfully merging, mema will be returned. If either argument
|
||||
is null or memb does not immediately follow mema, null will be
|
||||
returned.
|
||||
|
||||
Both mema and memb should have been previously allocated using
|
||||
malloc or a related routine such as realloc. If either mema or memb
|
||||
was not malloced or was previously freed, the result is undefined,
|
||||
but like mspace_free, the default is to abort the program.
|
||||
*/
|
||||
void* mspace_merge_objects(mspace msp, void* mema, void* memb);
|
||||
|
||||
/*
|
||||
mspace_calloc behaves as calloc, but operates within
|
||||
the given space.
|
||||
*/
|
||||
void* mspace_calloc(mspace msp, size_t n_elements, size_t elem_size);
|
||||
|
||||
/*
|
||||
mspace_memalign behaves as memalign, but operates within
|
||||
the given space.
|
||||
*/
|
||||
void* mspace_memalign(mspace msp, size_t alignment, size_t bytes);
|
||||
|
||||
/*
|
||||
mspace_independent_calloc behaves as independent_calloc, but
|
||||
operates within the given space.
|
||||
*/
|
||||
void** mspace_independent_calloc(mspace msp, size_t n_elements,
|
||||
size_t elem_size, void* chunks[]);
|
||||
|
||||
/*
|
||||
mspace_independent_comalloc behaves as independent_comalloc, but
|
||||
operates within the given space.
|
||||
*/
|
||||
void** mspace_independent_comalloc(mspace msp, size_t n_elements,
|
||||
size_t sizes[], void* chunks[]);
|
||||
|
||||
/*
|
||||
mspace_footprint() returns the number of bytes obtained from the
|
||||
system for this space.
|
||||
*/
|
||||
size_t mspace_footprint(mspace msp);
|
||||
|
||||
/*
|
||||
mspace_max_allowed_footprint() returns the number of bytes that
|
||||
this space is allowed to obtain from the system. See
|
||||
malloc_max_allowed_footprint() for a more in-depth description.
|
||||
|
||||
This function is only available if dlmalloc.c was compiled
|
||||
with USE_MAX_ALLOWED_FOOTPRINT set.
|
||||
*/
|
||||
size_t mspace_max_allowed_footprint(mspace msp);
|
||||
|
||||
/*
|
||||
mspace_set_max_allowed_footprint() sets the maximum number of
|
||||
bytes (rounded up to a page) that this space is allowed to
|
||||
obtain from the system. See malloc_set_max_allowed_footprint()
|
||||
for a more in-depth description.
|
||||
|
||||
This function is only available if dlmalloc.c was compiled
|
||||
with USE_MAX_ALLOWED_FOOTPRINT set.
|
||||
*/
|
||||
void mspace_set_max_allowed_footprint(mspace msp, size_t bytes);
|
||||
|
||||
/*
|
||||
mspace_max_footprint() returns the maximum number of bytes obtained
|
||||
from the system over the lifetime of this space.
|
||||
*/
|
||||
size_t mspace_max_footprint(mspace msp);
|
||||
|
||||
|
||||
#if !NO_MALLINFO
|
||||
/*
|
||||
mspace_mallinfo behaves as mallinfo, but reports properties of
|
||||
the given space.
|
||||
*/
|
||||
struct mallinfo mspace_mallinfo(mspace msp);
|
||||
#endif /* NO_MALLINFO */
|
||||
|
||||
/*
|
||||
mspace_malloc_stats behaves as malloc_stats, but reports
|
||||
properties of the given space.
|
||||
*/
|
||||
void mspace_malloc_stats(mspace msp);
|
||||
|
||||
/*
|
||||
mspace_trim behaves as malloc_trim, but
|
||||
operates within the given space.
|
||||
*/
|
||||
int mspace_trim(mspace msp, size_t pad);
|
||||
|
||||
/*
|
||||
An alias for mallopt.
|
||||
*/
|
||||
int mspace_mallopt(int, int);
|
||||
|
||||
#endif /* MSPACES */
|
||||
|
||||
#ifdef __cplusplus
|
||||
}; /* end of extern "C" */
|
||||
#endif
|
||||
|
||||
#endif /* MALLOC_280_H */
|
||||
|
@ -195,19 +195,9 @@ struct mallinfo mallinfo()
|
||||
return dlmallinfo();
|
||||
}
|
||||
|
||||
size_t malloc_usable_size(void* mem)
|
||||
{
|
||||
return dlmalloc_usable_size(mem);
|
||||
}
|
||||
|
||||
void* valloc(size_t bytes)
|
||||
{
|
||||
return dlvalloc(bytes);
|
||||
}
|
||||
|
||||
void* pvalloc(size_t bytes)
|
||||
{
|
||||
return dlpvalloc(bytes);
|
||||
void* valloc(size_t bytes) {
|
||||
/* assume page size of 4096 bytes */
|
||||
return memalign( getpagesize(), bytes );
|
||||
}
|
||||
|
||||
/* Support for malloc debugging.
|
||||
|
@ -1,27 +1,33 @@
|
||||
/*
|
||||
* Copyright (C) 2012 The Android Open Source Project
|
||||
* Copyright (C) 2008 The Android Open Source Project
|
||||
* All rights reserved.
|
||||
*
|
||||
* Licensed under the Apache License, Version 2.0 (the "License");
|
||||
* you may not use this file except in compliance with the License.
|
||||
* You may obtain a copy of the License at
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* * Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* * Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in
|
||||
* the documentation and/or other materials provided with the
|
||||
* distribution.
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||||
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||||
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
||||
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
|
||||
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*/
|
||||
#ifndef _MALLOC_H_
|
||||
#define _MALLOC_H_
|
||||
|
||||
#ifndef LIBC_INCLUDE_MALLOC_H_
|
||||
#define LIBC_INCLUDE_MALLOC_H_
|
||||
|
||||
/*
|
||||
* Declaration of malloc routines. Bionic uses dlmalloc (see
|
||||
* upstream-dlmalloc) but doesn't directly include it here to keep the
|
||||
* defined malloc.h interface small.
|
||||
*/
|
||||
#include <sys/cdefs.h>
|
||||
#include <stddef.h>
|
||||
|
||||
@ -30,32 +36,69 @@ __BEGIN_DECLS
|
||||
extern __mallocfunc void* malloc(size_t);
|
||||
extern __mallocfunc void* calloc(size_t, size_t);
|
||||
extern void* realloc(void *, size_t);
|
||||
extern void free(void *);
|
||||
extern void free(void *);
|
||||
|
||||
extern void* memalign(size_t alignment, size_t bytesize);
|
||||
extern size_t malloc_usable_size(void*);
|
||||
extern void* memalign(size_t alignment, size_t bytesize);
|
||||
extern void* valloc(size_t bytesize);
|
||||
extern void* pvalloc(size_t bytesize);
|
||||
extern int mallopt(int param_number, int param_value);
|
||||
extern size_t malloc_footprint(void);
|
||||
extern size_t malloc_max_footprint(void);
|
||||
|
||||
extern void* valloc(size_t bytesize);
|
||||
extern void* pvalloc(size_t bytesize);
|
||||
|
||||
#ifndef STRUCT_MALLINFO_DECLARED
|
||||
#define STRUCT_MALLINFO_DECLARED 1
|
||||
struct mallinfo {
|
||||
size_t arena;
|
||||
size_t ordblks;
|
||||
size_t smblks;
|
||||
size_t hblks;
|
||||
size_t hblkhd;
|
||||
size_t usmblks;
|
||||
size_t fsmblks;
|
||||
size_t uordblks;
|
||||
size_t fordblks;
|
||||
size_t keepcost;
|
||||
size_t arena; /* non-mmapped space allocated from system */
|
||||
size_t ordblks; /* number of free chunks */
|
||||
size_t smblks; /* always 0 */
|
||||
size_t hblks; /* always 0 */
|
||||
size_t hblkhd; /* space in mmapped regions */
|
||||
size_t usmblks; /* maximum total allocated space */
|
||||
size_t fsmblks; /* always 0 */
|
||||
size_t uordblks; /* total allocated space */
|
||||
size_t fordblks; /* total free space */
|
||||
size_t keepcost; /* releasable (via malloc_trim) space */
|
||||
};
|
||||
#endif /* STRUCT_MALLINFO_DECLARED */
|
||||
|
||||
extern struct mallinfo mallinfo(void);
|
||||
extern struct mallinfo mallinfo(void);
|
||||
|
||||
|
||||
/*
|
||||
malloc_usable_size(void* p);
|
||||
|
||||
Returns the number of bytes you can actually use in
|
||||
an allocated chunk, which may be more than you requested (although
|
||||
often not) due to alignment and minimum size constraints.
|
||||
You can use this many bytes without worrying about
|
||||
overwriting other allocated objects. This is not a particularly great
|
||||
programming practice. malloc_usable_size can be more useful in
|
||||
debugging and assertions, for example:
|
||||
|
||||
p = malloc(n);
|
||||
assert(malloc_usable_size(p) >= 256);
|
||||
*/
|
||||
extern size_t malloc_usable_size(void* block);
|
||||
|
||||
/*
|
||||
malloc_stats();
|
||||
Prints on stderr the amount of space obtained from the system (both
|
||||
via sbrk and mmap), the maximum amount (which may be more than
|
||||
current if malloc_trim and/or munmap got called), and the current
|
||||
number of bytes allocated via malloc (or realloc, etc) but not yet
|
||||
freed. Note that this is the number of bytes allocated, not the
|
||||
number requested. It will be larger than the number requested
|
||||
because of alignment and bookkeeping overhead. Because it includes
|
||||
alignment wastage as being in use, this figure may be greater than
|
||||
zero even when no user-level chunks are allocated.
|
||||
|
||||
The reported current and maximum system memory can be inaccurate if
|
||||
a program makes other calls to system memory allocation functions
|
||||
(normally sbrk) outside of malloc.
|
||||
|
||||
malloc_stats prints only the most commonly interesting statistics.
|
||||
More information can be obtained by calling mallinfo.
|
||||
*/
|
||||
extern void malloc_stats(void);
|
||||
|
||||
__END_DECLS
|
||||
|
||||
#endif /* LIBC_INCLUDE_MALLOC_H_ */
|
||||
#endif /* _MALLOC_H_ */
|
||||
|
||||
|
@ -1,10 +0,0 @@
|
||||
This directory contains malloc/free routines implemented by Doug Lea
|
||||
(aka dlmalloc). You should not edit these files directly. Make fixes
|
||||
upstream and then pull down the new version of the file.
|
||||
|
||||
This code is imported from: ftp://g.oswego.edu/pub/misc/
|
||||
It is currently version 2.8.5.
|
||||
|
||||
Currently there are very minor modifications that are signified with:
|
||||
BEGIN android-changed: change description
|
||||
END android-changed
|
File diff suppressed because it is too large
Load Diff
@ -1,622 +0,0 @@
|
||||
/*
|
||||
Default header file for malloc-2.8.x, written by Doug Lea
|
||||
and released to the public domain, as explained at
|
||||
http://creativecommons.org/publicdomain/zero/1.0/
|
||||
|
||||
This header is for ANSI C/C++ only. You can set any of
|
||||
the following #defines before including:
|
||||
|
||||
* If USE_DL_PREFIX is defined, it is assumed that malloc.c
|
||||
was also compiled with this option, so all routines
|
||||
have names starting with "dl".
|
||||
|
||||
* If HAVE_USR_INCLUDE_MALLOC_H is defined, it is assumed that this
|
||||
file will be #included AFTER <malloc.h>. This is needed only if
|
||||
your system defines a struct mallinfo that is incompatible with the
|
||||
standard one declared here. Otherwise, you can include this file
|
||||
INSTEAD of your system system <malloc.h>. At least on ANSI, all
|
||||
declarations should be compatible with system versions
|
||||
|
||||
* If MSPACES is defined, declarations for mspace versions are included.
|
||||
*/
|
||||
|
||||
#ifndef MALLOC_280_H
|
||||
#define MALLOC_280_H
|
||||
|
||||
#ifdef __cplusplus
|
||||
extern "C" {
|
||||
#endif
|
||||
|
||||
#include <stddef.h> /* for size_t */
|
||||
|
||||
#ifndef ONLY_MSPACES
|
||||
#define ONLY_MSPACES 0 /* define to a value */
|
||||
#elif ONLY_MSPACES != 0
|
||||
#define ONLY_MSPACES 1
|
||||
#endif /* ONLY_MSPACES */
|
||||
#ifndef NO_MALLINFO
|
||||
#define NO_MALLINFO 0
|
||||
#endif /* NO_MALLINFO */
|
||||
|
||||
#ifndef MSPACES
|
||||
#if ONLY_MSPACES
|
||||
#define MSPACES 1
|
||||
#else /* ONLY_MSPACES */
|
||||
#define MSPACES 0
|
||||
#endif /* ONLY_MSPACES */
|
||||
#endif /* MSPACES */
|
||||
|
||||
#if !ONLY_MSPACES
|
||||
|
||||
#ifndef USE_DL_PREFIX
|
||||
#define dlcalloc calloc
|
||||
#define dlfree free
|
||||
#define dlmalloc malloc
|
||||
#define dlmemalign memalign
|
||||
#define dlposix_memalign posix_memalign
|
||||
#define dlrealloc realloc
|
||||
#define dlvalloc valloc
|
||||
#define dlpvalloc pvalloc
|
||||
#define dlmallinfo mallinfo
|
||||
#define dlmallopt mallopt
|
||||
#define dlmalloc_trim malloc_trim
|
||||
#define dlmalloc_stats malloc_stats
|
||||
#define dlmalloc_usable_size malloc_usable_size
|
||||
#define dlmalloc_footprint malloc_footprint
|
||||
#define dlmalloc_max_footprint malloc_max_footprint
|
||||
#define dlmalloc_footprint_limit malloc_footprint_limit
|
||||
#define dlmalloc_set_footprint_limit malloc_set_footprint_limit
|
||||
#define dlmalloc_inspect_all malloc_inspect_all
|
||||
#define dlindependent_calloc independent_calloc
|
||||
#define dlindependent_comalloc independent_comalloc
|
||||
#define dlbulk_free bulk_free
|
||||
#endif /* USE_DL_PREFIX */
|
||||
|
||||
#if !NO_MALLINFO
|
||||
#ifndef HAVE_USR_INCLUDE_MALLOC_H
|
||||
#ifndef _MALLOC_H
|
||||
#ifndef MALLINFO_FIELD_TYPE
|
||||
#define MALLINFO_FIELD_TYPE size_t
|
||||
#endif /* MALLINFO_FIELD_TYPE */
|
||||
#ifndef STRUCT_MALLINFO_DECLARED
|
||||
#define STRUCT_MALLINFO_DECLARED 1
|
||||
struct mallinfo {
|
||||
MALLINFO_FIELD_TYPE arena; /* non-mmapped space allocated from system */
|
||||
MALLINFO_FIELD_TYPE ordblks; /* number of free chunks */
|
||||
MALLINFO_FIELD_TYPE smblks; /* always 0 */
|
||||
MALLINFO_FIELD_TYPE hblks; /* always 0 */
|
||||
MALLINFO_FIELD_TYPE hblkhd; /* space in mmapped regions */
|
||||
MALLINFO_FIELD_TYPE usmblks; /* maximum total allocated space */
|
||||
MALLINFO_FIELD_TYPE fsmblks; /* always 0 */
|
||||
MALLINFO_FIELD_TYPE uordblks; /* total allocated space */
|
||||
MALLINFO_FIELD_TYPE fordblks; /* total free space */
|
||||
MALLINFO_FIELD_TYPE keepcost; /* releasable (via malloc_trim) space */
|
||||
};
|
||||
#endif /* STRUCT_MALLINFO_DECLARED */
|
||||
#endif /* _MALLOC_H */
|
||||
#endif /* HAVE_USR_INCLUDE_MALLOC_H */
|
||||
#endif /* !NO_MALLINFO */
|
||||
|
||||
/*
|
||||
malloc(size_t n)
|
||||
Returns a pointer to a newly allocated chunk of at least n bytes, or
|
||||
null if no space is available, in which case errno is set to ENOMEM
|
||||
on ANSI C systems.
|
||||
|
||||
If n is zero, malloc returns a minimum-sized chunk. (The minimum
|
||||
size is 16 bytes on most 32bit systems, and 32 bytes on 64bit
|
||||
systems.) Note that size_t is an unsigned type, so calls with
|
||||
arguments that would be negative if signed are interpreted as
|
||||
requests for huge amounts of space, which will often fail. The
|
||||
maximum supported value of n differs across systems, but is in all
|
||||
cases less than the maximum representable value of a size_t.
|
||||
*/
|
||||
void* dlmalloc(size_t);
|
||||
|
||||
/*
|
||||
free(void* p)
|
||||
Releases the chunk of memory pointed to by p, that had been previously
|
||||
allocated using malloc or a related routine such as realloc.
|
||||
It has no effect if p is null. If p was not malloced or already
|
||||
freed, free(p) will by default cuase the current program to abort.
|
||||
*/
|
||||
void dlfree(void*);
|
||||
|
||||
/*
|
||||
calloc(size_t n_elements, size_t element_size);
|
||||
Returns a pointer to n_elements * element_size bytes, with all locations
|
||||
set to zero.
|
||||
*/
|
||||
void* dlcalloc(size_t, size_t);
|
||||
|
||||
/*
|
||||
realloc(void* p, size_t n)
|
||||
Returns a pointer to a chunk of size n that contains the same data
|
||||
as does chunk p up to the minimum of (n, p's size) bytes, or null
|
||||
if no space is available.
|
||||
|
||||
The returned pointer may or may not be the same as p. The algorithm
|
||||
prefers extending p in most cases when possible, otherwise it
|
||||
employs the equivalent of a malloc-copy-free sequence.
|
||||
|
||||
If p is null, realloc is equivalent to malloc.
|
||||
|
||||
If space is not available, realloc returns null, errno is set (if on
|
||||
ANSI) and p is NOT freed.
|
||||
|
||||
if n is for fewer bytes than already held by p, the newly unused
|
||||
space is lopped off and freed if possible. realloc with a size
|
||||
argument of zero (re)allocates a minimum-sized chunk.
|
||||
|
||||
The old unix realloc convention of allowing the last-free'd chunk
|
||||
to be used as an argument to realloc is not supported.
|
||||
*/
|
||||
void* dlrealloc(void*, size_t);
|
||||
|
||||
/*
|
||||
realloc_in_place(void* p, size_t n)
|
||||
Resizes the space allocated for p to size n, only if this can be
|
||||
done without moving p (i.e., only if there is adjacent space
|
||||
available if n is greater than p's current allocated size, or n is
|
||||
less than or equal to p's size). This may be used instead of plain
|
||||
realloc if an alternative allocation strategy is needed upon failure
|
||||
to expand space; for example, reallocation of a buffer that must be
|
||||
memory-aligned or cleared. You can use realloc_in_place to trigger
|
||||
these alternatives only when needed.
|
||||
|
||||
Returns p if successful; otherwise null.
|
||||
*/
|
||||
void* dlrealloc_in_place(void*, size_t);
|
||||
|
||||
/*
|
||||
memalign(size_t alignment, size_t n);
|
||||
Returns a pointer to a newly allocated chunk of n bytes, aligned
|
||||
in accord with the alignment argument.
|
||||
|
||||
The alignment argument should be a power of two. If the argument is
|
||||
not a power of two, the nearest greater power is used.
|
||||
8-byte alignment is guaranteed by normal malloc calls, so don't
|
||||
bother calling memalign with an argument of 8 or less.
|
||||
|
||||
Overreliance on memalign is a sure way to fragment space.
|
||||
*/
|
||||
void* dlmemalign(size_t, size_t);
|
||||
|
||||
/*
|
||||
int posix_memalign(void** pp, size_t alignment, size_t n);
|
||||
Allocates a chunk of n bytes, aligned in accord with the alignment
|
||||
argument. Differs from memalign only in that it (1) assigns the
|
||||
allocated memory to *pp rather than returning it, (2) fails and
|
||||
returns EINVAL if the alignment is not a power of two (3) fails and
|
||||
returns ENOMEM if memory cannot be allocated.
|
||||
*/
|
||||
int dlposix_memalign(void**, size_t, size_t);
|
||||
|
||||
/*
|
||||
valloc(size_t n);
|
||||
Equivalent to memalign(pagesize, n), where pagesize is the page
|
||||
size of the system. If the pagesize is unknown, 4096 is used.
|
||||
*/
|
||||
void* dlvalloc(size_t);
|
||||
|
||||
/*
|
||||
mallopt(int parameter_number, int parameter_value)
|
||||
Sets tunable parameters The format is to provide a
|
||||
(parameter-number, parameter-value) pair. mallopt then sets the
|
||||
corresponding parameter to the argument value if it can (i.e., so
|
||||
long as the value is meaningful), and returns 1 if successful else
|
||||
0. SVID/XPG/ANSI defines four standard param numbers for mallopt,
|
||||
normally defined in malloc.h. None of these are use in this malloc,
|
||||
so setting them has no effect. But this malloc also supports other
|
||||
options in mallopt:
|
||||
|
||||
Symbol param # default allowed param values
|
||||
M_TRIM_THRESHOLD -1 2*1024*1024 any (-1U disables trimming)
|
||||
M_GRANULARITY -2 page size any power of 2 >= page size
|
||||
M_MMAP_THRESHOLD -3 256*1024 any (or 0 if no MMAP support)
|
||||
*/
|
||||
int dlmallopt(int, int);
|
||||
|
||||
#define M_TRIM_THRESHOLD (-1)
|
||||
#define M_GRANULARITY (-2)
|
||||
#define M_MMAP_THRESHOLD (-3)
|
||||
|
||||
|
||||
/*
|
||||
malloc_footprint();
|
||||
Returns the number of bytes obtained from the system. The total
|
||||
number of bytes allocated by malloc, realloc etc., is less than this
|
||||
value. Unlike mallinfo, this function returns only a precomputed
|
||||
result, so can be called frequently to monitor memory consumption.
|
||||
Even if locks are otherwise defined, this function does not use them,
|
||||
so results might not be up to date.
|
||||
*/
|
||||
size_t dlmalloc_footprint(void);
|
||||
|
||||
/*
|
||||
malloc_max_footprint();
|
||||
Returns the maximum number of bytes obtained from the system. This
|
||||
value will be greater than current footprint if deallocated space
|
||||
has been reclaimed by the system. The peak number of bytes allocated
|
||||
by malloc, realloc etc., is less than this value. Unlike mallinfo,
|
||||
this function returns only a precomputed result, so can be called
|
||||
frequently to monitor memory consumption. Even if locks are
|
||||
otherwise defined, this function does not use them, so results might
|
||||
not be up to date.
|
||||
*/
|
||||
size_t dlmalloc_max_footprint(void);
|
||||
|
||||
/*
|
||||
malloc_footprint_limit();
|
||||
Returns the number of bytes that the heap is allowed to obtain from
|
||||
the system, returning the last value returned by
|
||||
malloc_set_footprint_limit, or the maximum size_t value if
|
||||
never set. The returned value reflects a permission. There is no
|
||||
guarantee that this number of bytes can actually be obtained from
|
||||
the system.
|
||||
*/
|
||||
size_t dlmalloc_footprint_limit(void);
|
||||
|
||||
/*
|
||||
malloc_set_footprint_limit();
|
||||
Sets the maximum number of bytes to obtain from the system, causing
|
||||
failure returns from malloc and related functions upon attempts to
|
||||
exceed this value. The argument value may be subject to page
|
||||
rounding to an enforceable limit; this actual value is returned.
|
||||
Using an argument of the maximum possible size_t effectively
|
||||
disables checks. If the argument is less than or equal to the
|
||||
current malloc_footprint, then all future allocations that require
|
||||
additional system memory will fail. However, invocation cannot
|
||||
retroactively deallocate existing used memory.
|
||||
*/
|
||||
size_t dlmalloc_set_footprint_limit(size_t bytes);
|
||||
|
||||
/*
|
||||
malloc_inspect_all(void(*handler)(void *start,
|
||||
void *end,
|
||||
size_t used_bytes,
|
||||
void* callback_arg),
|
||||
void* arg);
|
||||
Traverses the heap and calls the given handler for each managed
|
||||
region, skipping all bytes that are (or may be) used for bookkeeping
|
||||
purposes. Traversal does not include include chunks that have been
|
||||
directly memory mapped. Each reported region begins at the start
|
||||
address, and continues up to but not including the end address. The
|
||||
first used_bytes of the region contain allocated data. If
|
||||
used_bytes is zero, the region is unallocated. The handler is
|
||||
invoked with the given callback argument. If locks are defined, they
|
||||
are held during the entire traversal. It is a bad idea to invoke
|
||||
other malloc functions from within the handler.
|
||||
|
||||
For example, to count the number of in-use chunks with size greater
|
||||
than 1000, you could write:
|
||||
static int count = 0;
|
||||
void count_chunks(void* start, void* end, size_t used, void* arg) {
|
||||
if (used >= 1000) ++count;
|
||||
}
|
||||
then:
|
||||
malloc_inspect_all(count_chunks, NULL);
|
||||
|
||||
malloc_inspect_all is compiled only if MALLOC_INSPECT_ALL is defined.
|
||||
*/
|
||||
void dlmalloc_inspect_all(void(*handler)(void*, void *, size_t, void*),
|
||||
void* arg);
|
||||
|
||||
#if !NO_MALLINFO
|
||||
/*
|
||||
mallinfo()
|
||||
Returns (by copy) a struct containing various summary statistics:
|
||||
|
||||
arena: current total non-mmapped bytes allocated from system
|
||||
ordblks: the number of free chunks
|
||||
smblks: always zero.
|
||||
hblks: current number of mmapped regions
|
||||
hblkhd: total bytes held in mmapped regions
|
||||
usmblks: the maximum total allocated space. This will be greater
|
||||
than current total if trimming has occurred.
|
||||
fsmblks: always zero
|
||||
uordblks: current total allocated space (normal or mmapped)
|
||||
fordblks: total free space
|
||||
keepcost: the maximum number of bytes that could ideally be released
|
||||
back to system via malloc_trim. ("ideally" means that
|
||||
it ignores page restrictions etc.)
|
||||
|
||||
Because these fields are ints, but internal bookkeeping may
|
||||
be kept as longs, the reported values may wrap around zero and
|
||||
thus be inaccurate.
|
||||
*/
|
||||
|
||||
struct mallinfo dlmallinfo(void);
|
||||
#endif /* NO_MALLINFO */
|
||||
|
||||
/*
|
||||
independent_calloc(size_t n_elements, size_t element_size, void* chunks[]);
|
||||
|
||||
independent_calloc is similar to calloc, but instead of returning a
|
||||
single cleared space, it returns an array of pointers to n_elements
|
||||
independent elements that can hold contents of size elem_size, each
|
||||
of which starts out cleared, and can be independently freed,
|
||||
realloc'ed etc. The elements are guaranteed to be adjacently
|
||||
allocated (this is not guaranteed to occur with multiple callocs or
|
||||
mallocs), which may also improve cache locality in some
|
||||
applications.
|
||||
|
||||
The "chunks" argument is optional (i.e., may be null, which is
|
||||
probably the most typical usage). If it is null, the returned array
|
||||
is itself dynamically allocated and should also be freed when it is
|
||||
no longer needed. Otherwise, the chunks array must be of at least
|
||||
n_elements in length. It is filled in with the pointers to the
|
||||
chunks.
|
||||
|
||||
In either case, independent_calloc returns this pointer array, or
|
||||
null if the allocation failed. If n_elements is zero and "chunks"
|
||||
is null, it returns a chunk representing an array with zero elements
|
||||
(which should be freed if not wanted).
|
||||
|
||||
Each element must be freed when it is no longer needed. This can be
|
||||
done all at once using bulk_free.
|
||||
|
||||
independent_calloc simplifies and speeds up implementations of many
|
||||
kinds of pools. It may also be useful when constructing large data
|
||||
structures that initially have a fixed number of fixed-sized nodes,
|
||||
but the number is not known at compile time, and some of the nodes
|
||||
may later need to be freed. For example:
|
||||
|
||||
struct Node { int item; struct Node* next; };
|
||||
|
||||
struct Node* build_list() {
|
||||
struct Node** pool;
|
||||
int n = read_number_of_nodes_needed();
|
||||
if (n <= 0) return 0;
|
||||
pool = (struct Node**)(independent_calloc(n, sizeof(struct Node), 0);
|
||||
if (pool == 0) die();
|
||||
// organize into a linked list...
|
||||
struct Node* first = pool[0];
|
||||
for (i = 0; i < n-1; ++i)
|
||||
pool[i]->next = pool[i+1];
|
||||
free(pool); // Can now free the array (or not, if it is needed later)
|
||||
return first;
|
||||
}
|
||||
*/
|
||||
void** dlindependent_calloc(size_t, size_t, void**);
|
||||
|
||||
/*
|
||||
independent_comalloc(size_t n_elements, size_t sizes[], void* chunks[]);
|
||||
|
||||
independent_comalloc allocates, all at once, a set of n_elements
|
||||
chunks with sizes indicated in the "sizes" array. It returns
|
||||
an array of pointers to these elements, each of which can be
|
||||
independently freed, realloc'ed etc. The elements are guaranteed to
|
||||
be adjacently allocated (this is not guaranteed to occur with
|
||||
multiple callocs or mallocs), which may also improve cache locality
|
||||
in some applications.
|
||||
|
||||
The "chunks" argument is optional (i.e., may be null). If it is null
|
||||
the returned array is itself dynamically allocated and should also
|
||||
be freed when it is no longer needed. Otherwise, the chunks array
|
||||
must be of at least n_elements in length. It is filled in with the
|
||||
pointers to the chunks.
|
||||
|
||||
In either case, independent_comalloc returns this pointer array, or
|
||||
null if the allocation failed. If n_elements is zero and chunks is
|
||||
null, it returns a chunk representing an array with zero elements
|
||||
(which should be freed if not wanted).
|
||||
|
||||
Each element must be freed when it is no longer needed. This can be
|
||||
done all at once using bulk_free.
|
||||
|
||||
independent_comallac differs from independent_calloc in that each
|
||||
element may have a different size, and also that it does not
|
||||
automatically clear elements.
|
||||
|
||||
independent_comalloc can be used to speed up allocation in cases
|
||||
where several structs or objects must always be allocated at the
|
||||
same time. For example:
|
||||
|
||||
struct Head { ... }
|
||||
struct Foot { ... }
|
||||
|
||||
void send_message(char* msg) {
|
||||
int msglen = strlen(msg);
|
||||
size_t sizes[3] = { sizeof(struct Head), msglen, sizeof(struct Foot) };
|
||||
void* chunks[3];
|
||||
if (independent_comalloc(3, sizes, chunks) == 0)
|
||||
die();
|
||||
struct Head* head = (struct Head*)(chunks[0]);
|
||||
char* body = (char*)(chunks[1]);
|
||||
struct Foot* foot = (struct Foot*)(chunks[2]);
|
||||
// ...
|
||||
}
|
||||
|
||||
In general though, independent_comalloc is worth using only for
|
||||
larger values of n_elements. For small values, you probably won't
|
||||
detect enough difference from series of malloc calls to bother.
|
||||
|
||||
Overuse of independent_comalloc can increase overall memory usage,
|
||||
since it cannot reuse existing noncontiguous small chunks that
|
||||
might be available for some of the elements.
|
||||
*/
|
||||
void** dlindependent_comalloc(size_t, size_t*, void**);
|
||||
|
||||
/*
|
||||
bulk_free(void* array[], size_t n_elements)
|
||||
Frees and clears (sets to null) each non-null pointer in the given
|
||||
array. This is likely to be faster than freeing them one-by-one.
|
||||
If footers are used, pointers that have been allocated in different
|
||||
mspaces are not freed or cleared, and the count of all such pointers
|
||||
is returned. For large arrays of pointers with poor locality, it
|
||||
may be worthwhile to sort this array before calling bulk_free.
|
||||
*/
|
||||
size_t dlbulk_free(void**, size_t n_elements);
|
||||
|
||||
/*
|
||||
pvalloc(size_t n);
|
||||
Equivalent to valloc(minimum-page-that-holds(n)), that is,
|
||||
round up n to nearest pagesize.
|
||||
*/
|
||||
void* dlpvalloc(size_t);
|
||||
|
||||
/*
|
||||
malloc_trim(size_t pad);
|
||||
|
||||
If possible, gives memory back to the system (via negative arguments
|
||||
to sbrk) if there is unused memory at the `high' end of the malloc
|
||||
pool or in unused MMAP segments. You can call this after freeing
|
||||
large blocks of memory to potentially reduce the system-level memory
|
||||
requirements of a program. However, it cannot guarantee to reduce
|
||||
memory. Under some allocation patterns, some large free blocks of
|
||||
memory will be locked between two used chunks, so they cannot be
|
||||
given back to the system.
|
||||
|
||||
The `pad' argument to malloc_trim represents the amount of free
|
||||
trailing space to leave untrimmed. If this argument is zero, only
|
||||
the minimum amount of memory to maintain internal data structures
|
||||
will be left. Non-zero arguments can be supplied to maintain enough
|
||||
trailing space to service future expected allocations without having
|
||||
to re-obtain memory from the system.
|
||||
|
||||
Malloc_trim returns 1 if it actually released any memory, else 0.
|
||||
*/
|
||||
int dlmalloc_trim(size_t);
|
||||
|
||||
/*
|
||||
malloc_stats();
|
||||
Prints on stderr the amount of space obtained from the system (both
|
||||
via sbrk and mmap), the maximum amount (which may be more than
|
||||
current if malloc_trim and/or munmap got called), and the current
|
||||
number of bytes allocated via malloc (or realloc, etc) but not yet
|
||||
freed. Note that this is the number of bytes allocated, not the
|
||||
number requested. It will be larger than the number requested
|
||||
because of alignment and bookkeeping overhead. Because it includes
|
||||
alignment wastage as being in use, this figure may be greater than
|
||||
zero even when no user-level chunks are allocated.
|
||||
|
||||
The reported current and maximum system memory can be inaccurate if
|
||||
a program makes other calls to system memory allocation functions
|
||||
(normally sbrk) outside of malloc.
|
||||
|
||||
malloc_stats prints only the most commonly interesting statistics.
|
||||
More information can be obtained by calling mallinfo.
|
||||
|
||||
malloc_stats is not compiled if NO_MALLOC_STATS is defined.
|
||||
*/
|
||||
void dlmalloc_stats(void);
|
||||
|
||||
#endif /* !ONLY_MSPACES */
|
||||
|
||||
/*
|
||||
malloc_usable_size(void* p);
|
||||
|
||||
Returns the number of bytes you can actually use in
|
||||
an allocated chunk, which may be more than you requested (although
|
||||
often not) due to alignment and minimum size constraints.
|
||||
You can use this many bytes without worrying about
|
||||
overwriting other allocated objects. This is not a particularly great
|
||||
programming practice. malloc_usable_size can be more useful in
|
||||
debugging and assertions, for example:
|
||||
|
||||
p = malloc(n);
|
||||
assert(malloc_usable_size(p) >= 256);
|
||||
*/
|
||||
size_t dlmalloc_usable_size(void*);
|
||||
|
||||
#if MSPACES
|
||||
|
||||
/*
|
||||
mspace is an opaque type representing an independent
|
||||
region of space that supports mspace_malloc, etc.
|
||||
*/
|
||||
typedef void* mspace;
|
||||
|
||||
/*
|
||||
create_mspace creates and returns a new independent space with the
|
||||
given initial capacity, or, if 0, the default granularity size. It
|
||||
returns null if there is no system memory available to create the
|
||||
space. If argument locked is non-zero, the space uses a separate
|
||||
lock to control access. The capacity of the space will grow
|
||||
dynamically as needed to service mspace_malloc requests. You can
|
||||
control the sizes of incremental increases of this space by
|
||||
compiling with a different DEFAULT_GRANULARITY or dynamically
|
||||
setting with mallopt(M_GRANULARITY, value).
|
||||
*/
|
||||
mspace create_mspace(size_t capacity, int locked);
|
||||
|
||||
/*
|
||||
destroy_mspace destroys the given space, and attempts to return all
|
||||
of its memory back to the system, returning the total number of
|
||||
bytes freed. After destruction, the results of access to all memory
|
||||
used by the space become undefined.
|
||||
*/
|
||||
size_t destroy_mspace(mspace msp);
|
||||
|
||||
/*
|
||||
create_mspace_with_base uses the memory supplied as the initial base
|
||||
of a new mspace. Part (less than 128*sizeof(size_t) bytes) of this
|
||||
space is used for bookkeeping, so the capacity must be at least this
|
||||
large. (Otherwise 0 is returned.) When this initial space is
|
||||
exhausted, additional memory will be obtained from the system.
|
||||
Destroying this space will deallocate all additionally allocated
|
||||
space (if possible) but not the initial base.
|
||||
*/
|
||||
mspace create_mspace_with_base(void* base, size_t capacity, int locked);
|
||||
|
||||
/*
|
||||
mspace_track_large_chunks controls whether requests for large chunks
|
||||
are allocated in their own untracked mmapped regions, separate from
|
||||
others in this mspace. By default large chunks are not tracked,
|
||||
which reduces fragmentation. However, such chunks are not
|
||||
necessarily released to the system upon destroy_mspace. Enabling
|
||||
tracking by setting to true may increase fragmentation, but avoids
|
||||
leakage when relying on destroy_mspace to release all memory
|
||||
allocated using this space. The function returns the previous
|
||||
setting.
|
||||
*/
|
||||
int mspace_track_large_chunks(mspace msp, int enable);
|
||||
|
||||
#if !NO_MALLINFO
|
||||
/*
|
||||
mspace_mallinfo behaves as mallinfo, but reports properties of
|
||||
the given space.
|
||||
*/
|
||||
struct mallinfo mspace_mallinfo(mspace msp);
|
||||
#endif /* NO_MALLINFO */
|
||||
|
||||
/*
|
||||
An alias for mallopt.
|
||||
*/
|
||||
int mspace_mallopt(int, int);
|
||||
|
||||
/*
|
||||
The following operate identically to their malloc counterparts
|
||||
but operate only for the given mspace argument
|
||||
*/
|
||||
void* mspace_malloc(mspace msp, size_t bytes);
|
||||
void mspace_free(mspace msp, void* mem);
|
||||
void* mspace_calloc(mspace msp, size_t n_elements, size_t elem_size);
|
||||
void* mspace_realloc(mspace msp, void* mem, size_t newsize);
|
||||
void* mspace_realloc_in_place(mspace msp, void* mem, size_t newsize);
|
||||
void* mspace_memalign(mspace msp, size_t alignment, size_t bytes);
|
||||
void** mspace_independent_calloc(mspace msp, size_t n_elements,
|
||||
size_t elem_size, void* chunks[]);
|
||||
void** mspace_independent_comalloc(mspace msp, size_t n_elements,
|
||||
size_t sizes[], void* chunks[]);
|
||||
size_t mspace_bulk_free(mspace msp, void**, size_t n_elements);
|
||||
// BEGIN android-changed: added const
|
||||
size_t mspace_usable_size(const void* mem);
|
||||
// END android-changed
|
||||
void mspace_malloc_stats(mspace msp);
|
||||
int mspace_trim(mspace msp, size_t pad);
|
||||
size_t mspace_footprint(mspace msp);
|
||||
size_t mspace_max_footprint(mspace msp);
|
||||
size_t mspace_footprint_limit(mspace msp);
|
||||
size_t mspace_set_footprint_limit(mspace msp, size_t bytes);
|
||||
void mspace_inspect_all(mspace msp,
|
||||
void(*handler)(void *, void *, size_t, void*),
|
||||
void* arg);
|
||||
#endif /* MSPACES */
|
||||
|
||||
#ifdef __cplusplus
|
||||
}; /* end of extern "C" */
|
||||
#endif
|
||||
|
||||
#endif /* MALLOC_280_H */
|
Loading…
Reference in New Issue
Block a user