7086ad6919
In practice, with this implementation we never need to make a system call. We get the main thread's tid (which is the same as our pid) back from the set_tid_address system call we have to make during initialization. A new pthread will have the same pid as its parent, and a fork child's main (and only) thread will have a pid equal to its tid, which we get for free from the kernel before clone returns. The only time we'd actually have to make a getpid system call now is if we take a signal during fork and the signal handler calls getpid. (That, or we call getpid in the dynamic linker while it's still dealing with its own relocations and hasn't even set up the main thread yet.) Bug: 15387103 Change-Id: I6d4718ed0a5c912fc75b5f738c49a023dbed5189
122 lines
4.1 KiB
C++
122 lines
4.1 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _PTHREAD_INTERNAL_H_
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#define _PTHREAD_INTERNAL_H_
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#include <pthread.h>
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struct pthread_internal_t {
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struct pthread_internal_t* next;
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struct pthread_internal_t* prev;
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pid_t tid;
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private:
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pid_t cached_pid_;
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public:
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pid_t invalidate_cached_pid() {
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pid_t old_value;
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get_cached_pid(&old_value);
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set_cached_pid(0);
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return old_value;
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}
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void set_cached_pid(pid_t value) {
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cached_pid_ = value;
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}
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bool get_cached_pid(pid_t* cached_pid) {
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*cached_pid = cached_pid_;
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return (*cached_pid != 0);
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}
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void** tls;
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pthread_attr_t attr;
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__pthread_cleanup_t* cleanup_stack;
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void* (*start_routine)(void*);
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void* start_routine_arg;
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void* return_value;
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void* alternate_signal_stack;
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pthread_mutex_t startup_handshake_mutex;
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/*
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* The dynamic linker implements dlerror(3), which makes it hard for us to implement this
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* per-thread buffer by simply using malloc(3) and free(3).
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*/
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#define __BIONIC_DLERROR_BUFFER_SIZE 512
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char dlerror_buffer[__BIONIC_DLERROR_BUFFER_SIZE];
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};
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__LIBC_HIDDEN__ int __init_thread(pthread_internal_t* thread, bool add_to_thread_list);
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__LIBC_HIDDEN__ void __init_tls(pthread_internal_t* thread);
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__LIBC_HIDDEN__ void __init_alternate_signal_stack(pthread_internal_t*);
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__LIBC_HIDDEN__ void _pthread_internal_add(pthread_internal_t* thread);
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__LIBC_HIDDEN__ pthread_internal_t* __get_thread(void);
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__LIBC_HIDDEN__ void pthread_key_clean_all(void);
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__LIBC_HIDDEN__ void _pthread_internal_remove_locked(pthread_internal_t* thread);
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/* Has the thread been detached by a pthread_join or pthread_detach call? */
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#define PTHREAD_ATTR_FLAG_DETACHED 0x00000001
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/* Was the thread's stack allocated by the user rather than by us? */
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#define PTHREAD_ATTR_FLAG_USER_ALLOCATED_STACK 0x00000002
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/* Has the thread been joined by another thread? */
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#define PTHREAD_ATTR_FLAG_JOINED 0x00000004
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/* Is this the main thread? */
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#define PTHREAD_ATTR_FLAG_MAIN_THREAD 0x80000000
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/*
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* Traditionally we give threads a 1MiB stack. When we started
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* allocating per-thread alternate signal stacks to ease debugging of
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* stack overflows, we subtracted the same amount we were using there
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* from the default thread stack size. This should keep memory usage
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* roughly constant.
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*/
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#define PTHREAD_STACK_SIZE_DEFAULT ((1 * 1024 * 1024) - SIGSTKSZ)
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__LIBC_HIDDEN__ extern pthread_internal_t* g_thread_list;
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__LIBC_HIDDEN__ extern pthread_mutex_t g_thread_list_lock;
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__LIBC_HIDDEN__ int __timespec_from_absolute(timespec*, const timespec*, clockid_t);
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/* Needed by fork. */
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__LIBC_HIDDEN__ extern void __bionic_atfork_run_prepare();
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__LIBC_HIDDEN__ extern void __bionic_atfork_run_child();
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__LIBC_HIDDEN__ extern void __bionic_atfork_run_parent();
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#endif /* _PTHREAD_INTERNAL_H_ */
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