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semi-libc/src/thread
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Rich Felker e803829e6b fix potential deadlock bug in libc-internal locking logic 
if a multithreaded program became non-multithreaded (i.e. all other
threads exited) while one thread held an internal lock, the remaining
thread would fail to release the lock. the the program then became
multithreaded again at a later time, any further attempts to obtain
the lock would deadlock permanently.

the underlying cause is that the value of libc.threads_minus_1 at
unlock time might not match the value at lock time. one solution would
be returning a flag to the caller indicating whether the lock was
taken and needs to be unlocked, but there is a simpler solution: using
the lock itself as such a flag.

note that this flag is not needed anyway for correctness; if the lock
is not held, the unlock code is harmless. however, the memory
synchronization properties associated with a_store are costly on some
archs, so it's best to avoid executing the unlock code when it is
unnecessary.
2013-09-20 02:00:27 -04:00
..
arm
add support for TLS variant I, presently needed for arm and mips
2012-10-15 18:51:53 -04:00
i386
beginnings of full TLS support in shared libraries
2012-10-04 21:01:56 -04:00
microblaze
fix order of syscall args for microblaze clone syscall
2012-10-19 00:27:03 -04:00
mips
fix clobbering of caller's stack in mips __clone function
2013-09-16 11:52:39 -04:00
powerpc
powerpc: handle syscall error in clone.
2012-11-19 16:58:09 +01:00
x86_64
fix some indention-with-spaces that crept in
2012-09-29 01:14:07 -04:00
__futex.c
global cleanup to use the new syscall interface
2011-03-20 00:16:43 -04:00
__lock.c
fix potential deadlock bug in libc-internal locking logic
2013-09-20 02:00:27 -04:00
__set_thread_area.c
generic c version of __set_thread_area for archs where it works
2012-07-11 11:34:46 -04:00
__timedwait.c
simplify unified timed wait code, drop support for newer method
2011-08-07 11:14:32 -04:00
__unmapself.c
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
__wait.c
reduce some ridiculously large spin counts
2011-05-06 21:45:48 -04:00
cancel_dummy.c
use weak aliases rather than function pointers to simplify some code
2011-08-06 20:09:51 -04:00
cancel_impl.c
remove leftover cp_sp cruft from cancellation code, fix small bug
2012-05-25 00:35:09 -04:00
cancellation.c
simplify cancellation push/pop slightly
2012-05-23 14:13:54 -04:00
clone.c
overhaul clone syscall wrapping
2011-09-18 10:14:37 -04:00
lock_ptc.c
support for TLS in dynamic-loaded (dlopen) modules
2012-10-05 11:51:50 -04:00
pthread_atfork.c
ditch the priority inheritance locks; use malloc's version of lock
2012-04-24 16:32:23 -04:00
pthread_attr_destroy.c
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
pthread_attr_get.c
make pthread attribute types structs, even when they just have one field
2013-07-22 13:57:02 -04:00
pthread_attr_init.c
clean up sloppy nested inclusion from pthread_impl.h
2012-11-08 17:04:20 -05:00
pthread_attr_setdetachstate.c
reject invalid attribute settings
2011-03-07 15:46:37 -05:00
pthread_attr_setguardsize.c
reorganize pthread data structures and move the definitions to alltypes.h
2011-02-17 17:16:20 -05:00
pthread_attr_setinheritsched.c
add support for thread scheduling (POSIX TPS option)
2012-11-11 15:38:04 -05:00
pthread_attr_setschedparam.c
add support for thread scheduling (POSIX TPS option)
2012-11-11 15:38:04 -05:00
pthread_attr_setschedpolicy.c
add support for thread scheduling (POSIX TPS option)
2012-11-11 15:38:04 -05:00
pthread_attr_setscope.c
add support for thread scheduling (POSIX TPS option)
2012-11-11 15:38:04 -05:00
pthread_attr_setstack.c
pthread stack treatment overhaul for application-provided stacks, etc.
2013-02-01 22:10:40 -05:00
pthread_attr_setstacksize.c
pthread stack treatment overhaul for application-provided stacks, etc.
2013-02-01 22:10:40 -05:00
pthread_barrier_destroy.c
next step making barrier self-sync'd destruction safe
2011-09-28 18:00:02 -04:00
pthread_barrier_init.c
make pthread attribute types structs, even when they just have one field
2013-07-22 13:57:02 -04:00
pthread_barrier_wait.c
fix extremely rare but dangerous race condition in robust mutexes
2012-08-17 17:13:53 -04:00
pthread_barrierattr_destroy.c
implement barrier attribute functions (essentially no-ops)
2011-03-07 15:42:52 -05:00
pthread_barrierattr_init.c
clean up sloppy nested inclusion from pthread_impl.h
2012-11-08 17:04:20 -05:00
pthread_barrierattr_setpshared.c
make pthread attribute types structs, even when they just have one field
2013-07-22 13:57:02 -04:00
pthread_cond_broadcast.c
another cond var fix: requeue count race condition
2011-09-26 13:14:41 -04:00
pthread_cond_destroy.c
synchronize cond var destruction with exiting waits
2011-10-02 22:58:28 -04:00
pthread_cond_init.c
make pthread attribute types structs, even when they just have one field
2013-07-22 13:57:02 -04:00
pthread_cond_signal.c
redo cond vars again, use sequence numbers
2011-09-26 00:25:13 -04:00
pthread_cond_timedwait.c
use restrict everywhere it's required by c99 and/or posix 2008
2012-09-06 22:44:55 -04:00
pthread_cond_wait.c
use restrict everywhere it's required by c99 and/or posix 2008
2012-09-06 22:44:55 -04:00
pthread_condattr_destroy.c
implement pthread_condattr_* interfaces
2011-03-07 16:20:12 -05:00
pthread_condattr_init.c
clean up sloppy nested inclusion from pthread_impl.h
2012-11-08 17:04:20 -05:00
pthread_condattr_setclock.c
make pthread attribute types structs, even when they just have one field
2013-07-22 13:57:02 -04:00
pthread_condattr_setpshared.c
make pthread attribute types structs, even when they just have one field
2013-07-22 13:57:02 -04:00
pthread_create.c
omit CLONE_PARENT flag to clone in pthread_create
2013-09-16 10:56:01 -04:00
pthread_detach.c
fix several locks that weren't updated right for new futex-based __lock
2012-07-12 11:23:43 -04:00
pthread_equal.c
macro for pthread_equal
2011-08-14 15:17:36 -04:00
pthread_getattr_np.c
support configurable page size on mips, powerpc and microblaze
2013-09-15 02:00:32 +00:00
pthread_getconcurrency.c
implement pthread_[sg]etconcurrency.
2011-05-30 11:31:07 -04:00
pthread_getcpuclockid.c
support cputime clocks for processes/threads other than self
2013-06-08 11:36:41 -04:00
pthread_getschedparam.c
fix syscall argument bug in pthread_getschedparam
2013-06-26 22:02:23 -04:00
pthread_getspecific.c
optimize POSIX TSD for fast pthread_getspecific
2011-03-03 18:30:44 -05:00
pthread_join.c
clean up sloppy nested inclusion from pthread_impl.h
2012-11-08 17:04:20 -05:00
pthread_key_create.c
add proper fuxed-based locking for stdio
2011-07-30 08:02:14 -04:00
pthread_kill.c
fix several locks that weren't updated right for new futex-based __lock
2012-07-12 11:23:43 -04:00
pthread_mutex_consistent.c
implement robust mutexes
2011-03-17 20:41:37 -04:00
pthread_mutex_destroy.c
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
pthread_mutex_getprioceiling.c
add stub versions of some missing optional pthread interfaces
2012-11-17 18:42:16 -05:00
pthread_mutex_init.c
make pthread attribute types structs, even when they just have one field
2013-07-22 13:57:02 -04:00
pthread_mutex_lock.c
add fast path for normal mutexes back to pthread_mutex_lock
2011-08-07 04:50:02 -04:00
pthread_mutex_setprioceiling.c
add stub versions of some missing optional pthread interfaces
2012-11-17 18:42:16 -05:00
pthread_mutex_timedlock.c
use restrict everywhere it's required by c99 and/or posix 2008
2012-09-06 22:44:55 -04:00
pthread_mutex_trylock.c
recovering ownerdead robust mutex must reset recursive lock count
2011-10-03 00:27:47 -04:00
pthread_mutex_unlock.c
fix extremely rare but dangerous race condition in robust mutexes
2012-08-17 17:13:53 -04:00
pthread_mutexattr_destroy.c
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
pthread_mutexattr_init.c
clean up sloppy nested inclusion from pthread_impl.h
2012-11-08 17:04:20 -05:00
pthread_mutexattr_setprotocol.c
add stub versions of some missing optional pthread interfaces
2012-11-17 18:42:16 -05:00
pthread_mutexattr_setpshared.c
make pthread attribute types structs, even when they just have one field
2013-07-22 13:57:02 -04:00
pthread_mutexattr_setrobust.c
make pthread attribute types structs, even when they just have one field
2013-07-22 13:57:02 -04:00
pthread_mutexattr_settype.c
make pthread attribute types structs, even when they just have one field
2013-07-22 13:57:02 -04:00
pthread_once.c
fix major breakage in pthread_once (it was always deadlocking)
2011-03-08 12:08:40 -05:00
pthread_rwlock_destroy.c
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
pthread_rwlock_init.c
clean up sloppy nested inclusion from pthread_impl.h
2012-11-08 17:04:20 -05:00
pthread_rwlock_rdlock.c
overhaul rwlocks to address several issues
2011-08-03 10:21:32 -04:00
pthread_rwlock_timedrdlock.c
use restrict everywhere it's required by c99 and/or posix 2008
2012-09-06 22:44:55 -04:00
pthread_rwlock_timedwrlock.c
use restrict everywhere it's required by c99 and/or posix 2008
2012-09-06 22:44:55 -04:00
pthread_rwlock_tryrdlock.c
overhaul rwlocks to address several issues
2011-08-03 10:21:32 -04:00
pthread_rwlock_trywrlock.c
overhaul rwlocks to address several issues
2011-08-03 10:21:32 -04:00
pthread_rwlock_unlock.c
fix failure-to-wake in rwlock unlock
2011-10-01 09:11:35 -04:00
pthread_rwlock_wrlock.c
overhaul rwlocks to address several issues
2011-08-03 10:21:32 -04:00
pthread_rwlockattr_destroy.c
implement pthread_rwlockattr_* (essentially no-ops)
2011-03-07 16:43:25 -05:00
pthread_rwlockattr_init.c
clean up sloppy nested inclusion from pthread_impl.h
2012-11-08 17:04:20 -05:00
pthread_rwlockattr_setpshared.c
make pthread attribute types structs, even when they just have one field
2013-07-22 13:57:02 -04:00
pthread_self.c
ensure that thread dtv pointer is never null to optimize __tls_get_addr
2013-06-03 16:35:59 -04:00
pthread_setcancelstate.c
fix minor bugs due to incorrect threaded-predicate semantics
2011-04-20 21:41:45 -04:00
pthread_setcanceltype.c
handle pending cancellation when enabling async cancellation
2011-09-04 21:37:07 -04:00
pthread_setconcurrency.c
implement pthread_[sg]etconcurrency.
2011-05-30 11:31:07 -04:00
pthread_setschedparam.c
fix failure of pthread_setschedparam to pass correct param to kernel
2013-06-26 21:34:44 -04:00
pthread_setschedprio.c
add support for thread scheduling (POSIX TPS option)
2012-11-11 15:38:04 -05:00
pthread_setspecific.c
optimize POSIX TSD for fast pthread_getspecific
2011-03-03 18:30:44 -05:00
pthread_sigmask.c
remove __SYSCALL_SSLEN arch macro in favor of using public _NSIG
2013-03-26 23:07:31 -04:00
pthread_spin_destroy.c
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
pthread_spin_init.c
initial check-in, version 0.5.0
2011-02-12 00:22:29 -05:00
pthread_spin_lock.c
fix more instances of old a_xchg (use new a_swap name)
2011-09-16 14:33:51 -04:00
pthread_spin_trylock.c
fix more instances of old a_xchg (use new a_swap name)
2011-09-16 14:33:51 -04:00
pthread_spin_unlock.c
prepare pthread_spin_unlock for archs that need memory barriers
2011-03-24 23:06:48 -04:00
pthread_testcancel.c
use weak aliases rather than function pointers to simplify some code
2011-08-06 20:09:51 -04:00
sem_destroy.c
implement POSIX semaphores
2011-03-04 00:45:59 -05:00
sem_getvalue.c
use restrict everywhere it's required by c99 and/or posix 2008
2012-09-06 22:44:55 -04:00
sem_init.c
fix uninitialized waiters field in semaphores
2011-04-19 13:16:59 -04:00
sem_open.c
fix temp file leak in sem_open on successful creation of new semaphore
2013-06-26 21:41:51 -04:00
sem_post.c
report sem value overflows in sem_post
2011-10-26 00:28:47 -04:00
sem_timedwait.c
use restrict everywhere it's required by c99 and/or posix 2008
2012-09-06 22:44:55 -04:00
sem_trywait.c
retry on cas failures in sem_trywait
2012-07-24 00:51:36 -04:00
sem_unlink.c
implement POSIX semaphores
2011-03-04 00:45:59 -05:00
sem_wait.c
implement POSIX semaphores
2011-03-04 00:45:59 -05:00
synccall.c
fix mips-specific bug in synccall (too little space for signal mask)
2013-09-02 15:19:37 -04:00
syscall_cp.c
overhaul pthread cancellation
2011-04-17 11:43:03 -04:00
tls.c
beginnings of full TLS support in shared libraries
2012-10-04 21:01:56 -04:00
vmlock.c
fix extremely rare but dangerous race condition in robust mutexes
2012-08-17 17:13:53 -04:00