ba9c6f0989
Private futexes are a recent kernel addition: faster futexes that cannot be shared between processes. This patch uses them by default, unless the PROCESS_SHARED attribute flag is used when creating a mutex and/or conditional variable. Also introduces pthread_condattr_init/destroy/setpshared/getpshared. Change-Id: I3a0e2116f467072b046524cb5babc00e41057a53
177 lines
6.7 KiB
Plaintext
177 lines
6.7 KiB
Plaintext
Bionic ChangeLog:
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-----------------
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Differences between current and Android 2.1:
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- Add support for SH-4 CPU architecture !
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- __atomic_swap(): use LDREX/STREX CPU instructions on ARMv6 and higher.
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- <arpa/telnet.h>: New header (declarations only, no implementation).
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- <err.h>: New header + implementation. GLibc compatibility.
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- <warn.h>: New header + implementation. GLibc compatibility.
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- <fts.h>: New header + implementation.
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- <mntent.h>: Add missing <stdio.h> include.
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- <regex.h>: New header + implementation.
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- <signal.h>: Added killpg()
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- <stdint.h>: Allow 64-bit type declarations on C99 builds.
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- <stdio.h>: Add fdprintf() and vfdprintf(). Note that GLibc provides
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the confusing 'dprintf' and 'vdprintf()' functions instead.
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- <stdlib.h>: Fix ptsname_r(): the return type is int instead of char*.
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The mistake comes from a GLibc man page bug (the man page listed a return
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type of char*, while the implementation used int. Fixed in late 2009 only).
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The Bionic implementation was incorrect. Technically, this is an ABI
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breakage, but code that used this function probably never worked or
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compiled properly anyway.
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- <strings.h>: Add missing <sys/types.h> include.
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- <sys/queue.h>: Added new header (no implementation - macro templates).
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- <sys/resource.h>: Add rlim_t proper definition.
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- <time64.h>: Add missing C++ header inclusion guards.
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- <unistd.h>: Add getusershell(), setusershell() and endusershell(), though
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implementation are bogus. GLibc compatibility.
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- <wchar.h>: Add mbstowcs() and wcstombs()
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- add clone() implementation for ARM (x86 and SH-4 not working yet).
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- <sys/epoll.h>: <sys/system_properties.h>: Add missing C++ inclusion guards
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- fix getpwnam() and getpwgrp() to accept "app_0" as a valid user name.
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- fix sem_trywait() to return -1 and set errno to EAGAIN, instead of
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returning EAGAIN directly.
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- fix sem_post() to wake up multiple threads when called rapidly in
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succession.
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- DNS: partial implementation of RFC3484 (rule 1, 2, 5, 6, 8, 10 and
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modified rule 9), for better address selection/sorting.
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In the process, removed code that was previously used for "sortlist"
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in /etc/resolv.conf. (resolv.conf is already ignored, so the latter
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is a no-op for actual functionality.)
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- fix pthread_sigmask() to properly return an error code without touching
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errno. Previous implementation returned -1 on error, setting errno, which
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is not Posix compliant.
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- add sigaltstack() implementation for ARM.
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- <time.h>: Properly implement the 'timezone' and 'daylight' global variables
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(they were not defined previously, though declared in the header).
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- <time.h>: Fix timezone management implementation to properly update
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'tm_gmtoff' field in 'struct tm' structure.
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- DNS: get rid of spurious random DNS queries when trying to resolve
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an unknown domain name. Due to an initialization bug, a random DNS search
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list was generated for each thread is net.dns.search is not defined.
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- <pthread.h>: Add pthread_condattr_init/destroy/setpshared/getpshared.
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Also modify mutex and condvar implementation to use private futexes by
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default, unless PROCESS_SHARED is specified in the init attributes.
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Private futexes are limited to a single address space and can't be shared
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among processes. However they are much faster to wake/wait for. This should
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speed up mutex and condvar operations.
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NOTE: PROCESS_SHARED mutexes are still NOT robust (see note below).
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-------------------------------------------------------------------------------
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Differences between Android 2.1 and 2.0.1:
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- zoneinfo: updated data tables to version 2009s
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-------------------------------------------------------------------------------
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Differences between Android 2.0.1 and 2.0:
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- abort(): ARM-specific hack to preserve the 'lr' register when abort()
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is called (GCC does not preserve it by default since it thinks that
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abort() never returns). This improves stack traces considerably.
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-------------------------------------------------------------------------------
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Differences between Android 2.0 and 1.6:
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- memcmp(), memcpy(): ARMv7 optimized versions.
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- pthread_mutexattr_setpshared(): implementation will not return ENOTSUP
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if PTHREAD_PROCESS_SHARED is used, because our Mutex implementation can
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work across multiple processes.
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*HOWEVER* it does not use "robust futexes" which means that held mutexes
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*are not* automatically released by the kernel when the owner process
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crashes or exits. This is only done to simplify communication between
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two always-live system processes, DO NOT USE THIS IN APPLICATIONS !
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- pthread_mutex_lock_timeout_np(): New Android-specific function to
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perform a timed lock (). In case of timeout, it returns EBUSY.
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- pthread_cond_timedwait_monotonic_np(): Same as pthread_cond_timedwait()
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but uses the monotonic clock(). Android-specific.
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- pthread_cond_timedwait_relative_np(): Same as pthread_cond_timedwait()
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but uses a relative timeout instead. Android-specific.
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- <netinet/in.h>: Now includes <netinet/in6.h>.
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- <netinet/in6.h>: Added IPV6_JOIN_GROUP, IPV6_LEAVE_GROUP, IN6ADDR_ANY_INIT
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and ipv6mr_interface definitions.
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- <time.h>:
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* Add missing tzset() declaration.
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* Add Android-specific strftime_tz().
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- getaddrinfo():
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Only perform IPv6 lookup for AF_UNSPEC if we have IPv6 connectivity.
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This saves one DNS query per lookup on non-IPv6 systems.
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- mktime(): Fix an infinite loop problen that appeared when switching to
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GCC 4.4.0.
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- strftime(): fix incorrect handling of dates > 2038 due to 64-bit issue
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in original code.
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-------------------------------------------------------------------------------
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Differences between Android 1.6 and 1.5:
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- C runtime: Fix runtime initialization to be called before any static C++
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constructors. This allows these to use pthread functions properly.
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- __aeabi_atexit(): Fix implementation to properly call C++ static destructors
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when the program exits (or when a shared library is unloaded).
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- <sys/stat.h>: added GLibc compatibility macros definitions:
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#define st_atimensec st_atime_nsec
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#define st_mtimensec st_mtime_nsec
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#define st_ctimensec st_ctime_nsec
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- getaddrinfo(): implementation will now allow numeric ports if ai_socktype is
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set to ANY. This is to match the GLibc behaviour.
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- getservent(): and getservent_r() incorrectly returned the port in host-endian
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order in the s_port field. It now returns it in big-endian order.
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- DNS: Allow underscore in the middle of DNS labels. While not really
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standard, this extension is needed for some VPN configurations and is
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supported by other operating systems.
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- DNS: Support for DNS domain search lists through the new net.dns.search
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system property. The corresponding value must be a space-separated list of
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domain suffixes.
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