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musl/src/thread
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Rich Felker 4da268f74b fix issue with longjmp out of signal handlers and cancellation 
stale state information indicating that a thread was possibly blocked
at a cancellation point could get left behind if longjmp was used to
exit a signal handler that interrupted a cancellation point.

to fix the issue, we throw away the state information entirely and
simply compare the saved instruction pointer to a range of code
addresses in the __syscall_cp_asm function. all the ugly PIC work
(which becomes minimal anyway with this approach) is defered to
cancellation time instead of happening at every syscall, which should
improve performance too.

this commit also fixes cancellation on arm, which was mildly broken
(race condition, not checking cancellation flag once inside the
cancellation point zone). apparently i forgot to implement that. the
new arm code is untested, but appears correct; i'll test and fix it
later if there are problems.
2012-05-23 15:45:41 -04:00
..
arm fix issue with longjmp out of signal handlers and cancellation 2012-05-23 15:45:41 -04:00
i386 fix issue with longjmp out of signal handlers and cancellation 2012-05-23 15:45:41 -04:00
x86_64 fix issue with longjmp out of signal handlers and cancellation 2012-05-23 15:45:41 -04:00
__futex.c global cleanup to use the new syscall interface 2011-03-20 00:16:43 -04:00
__lock.c ditch the priority inheritance locks; use malloc's version of lock 2012-04-24 16:32:23 -04:00
__set_thread_area.c overhaul clone syscall wrapping 2011-09-18 10:14:37 -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
__wake.c consistency: change all remaining syscalls to use SYS_ rather than __NR_ prefix 2011-04-06 20:32:53 -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 fix issue with longjmp out of signal handlers and cancellation 2012-05-23 15:45:41 -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
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_getdetachstate.c fix pthread_attr_* implementations to match corrected prototypes 2011-03-11 09:51:14 -05:00
pthread_attr_getguardsize.c fix pthread_attr_* implementations to match corrected prototypes 2011-03-11 09:51:14 -05:00
pthread_attr_getschedparam.c implement dummy pthread_attr_[gs]etschedparam functions 2011-03-11 09:51:54 -05:00
pthread_attr_getscope.c fix pthread_attr_* implementations to match corrected prototypes 2011-03-11 09:51:14 -05:00
pthread_attr_getstacksize.c fix pthread_attr_* implementations to match corrected prototypes 2011-03-11 09:51:14 -05:00
pthread_attr_init.c initial check-in, version 0.5.0 2011-02-12 00:22:29 -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_setschedparam.c implement dummy pthread_attr_[gs]etschedparam functions 2011-03-11 09:51:54 -05:00
pthread_attr_setscope.c reject invalid attribute settings 2011-03-07 15:46:37 -05:00
pthread_attr_setstacksize.c enforce stack size min in pthread_attr_setstacksize 2011-03-04 00:59:14 -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 process-shared barrier support, based on discussion with bdonlan 2011-09-27 13:50:29 -04:00
pthread_barrier_wait.c fix excessive/insufficient wakes in __vm_unlock 2011-09-28 19:45:37 -04:00
pthread_barrierattr_destroy.c implement barrier attribute functions (essentially no-ops) 2011-03-07 15:42:52 -05:00
pthread_barrierattr_getpshared.c convert the barrier pshared option back to 0/1 values when getting it 2011-09-27 17:02:19 -04:00
pthread_barrierattr_init.c implement barrier attribute functions (essentially no-ops) 2011-03-07 15:42:52 -05:00
pthread_barrierattr_setpshared.c process-shared barrier support, based on discussion with bdonlan 2011-09-27 13:50:29 -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 new futex-requeue-based pthread_cond_broadcast implementation 2011-09-25 02:38:03 -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 synchronize cond var destruction with exiting waits 2011-10-02 22:58:28 -04:00
pthread_cond_wait.c initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00
pthread_condattr_destroy.c implement pthread_condattr_* interfaces 2011-03-07 16:20:12 -05:00
pthread_condattr_getclock.c implement pthread_condattr_* interfaces 2011-03-07 16:20:12 -05:00
pthread_condattr_getpshared.c implement pthread_condattr_* interfaces 2011-03-07 16:20:12 -05:00
pthread_condattr_init.c implement pthread_condattr_* interfaces 2011-03-07 16:20:12 -05:00
pthread_condattr_setclock.c disallow cpu time clocks as condattr clock values 2011-03-08 02:32:42 -05:00
pthread_condattr_setpshared.c implement pthread_condattr_* interfaces 2011-03-07 16:20:12 -05:00
pthread_create.c simplify cancellation push/pop slightly 2012-05-23 14:13:54 -04:00
pthread_detach.c fix more instances of old a_xchg (use new a_swap name) 2011-09-16 14:33:51 -04:00
pthread_equal.c macro for pthread_equal 2011-08-14 15:17:36 -04:00
pthread_getconcurrency.c implement pthread_[sg]etconcurrency. 2011-05-30 11:31:07 -04:00
pthread_getspecific.c optimize POSIX TSD for fast pthread_getspecific 2011-03-03 18:30:44 -05:00
pthread_join.c fix serious bug in pthread_join 2011-09-11 12:35:41 -04:00
pthread_key_create.c add proper fuxed-based locking for stdio 2011-07-30 08:02:14 -04:00
pthread_kill.c fix race condition in pthread_kill 2011-06-14 01:35:51 -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_init.c implement robust mutexes 2011-03-17 20:41:37 -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_timedlock.c unify and overhaul timed futex waits 2011-08-02 21:11:36 -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 simplify robust mutex unlock code path 2011-10-03 00:19:05 -04:00
pthread_mutexattr_destroy.c initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00
pthread_mutexattr_getpshared.c implement pthread_mutexattr_[gs]etpshared functions 2011-03-08 02:33:37 -05:00
pthread_mutexattr_getrobust.c implement robust mutexes 2011-03-17 20:41:37 -04:00
pthread_mutexattr_gettype.c initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00
pthread_mutexattr_init.c initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00
pthread_mutexattr_setpshared.c implement pthread_mutexattr_[gs]etpshared functions 2011-03-08 02:33:37 -05:00
pthread_mutexattr_setrobust.c implement robust mutexes 2011-03-17 20:41:37 -04:00
pthread_mutexattr_settype.c initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00
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 initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00
pthread_rwlock_rdlock.c overhaul rwlocks to address several issues 2011-08-03 10:21:32 -04:00
pthread_rwlock_timedrdlock.c overhaul rwlocks to address several issues 2011-08-03 10:21:32 -04:00
pthread_rwlock_timedwrlock.c overhaul rwlocks to address several issues 2011-08-03 10:21:32 -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_getpshared.c implement pthread_rwlockattr_* (essentially no-ops) 2011-03-07 16:43:25 -05:00
pthread_rwlockattr_init.c implement pthread_rwlockattr_* (essentially no-ops) 2011-03-07 16:43:25 -05:00
pthread_rwlockattr_setpshared.c implement pthread_rwlockattr_* (essentially no-ops) 2011-03-07 16:43:25 -05:00
pthread_self.c work around "signal loses thread pointer" issue with "approach 2" 2012-02-27 18:51:02 -05:00
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_setspecific.c optimize POSIX TSD for fast pthread_getspecific 2011-03-03 18:30:44 -05:00
pthread_sigmask.c clean up pthread_sigmask/sigprocmask dependency order 2011-07-30 21:09:14 -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 implement POSIX semaphores 2011-03-04 00:45:59 -05:00
sem_init.c fix uninitialized waiters field in semaphores 2011-04-19 13:16:59 -04:00
sem_open.c fix useless use of potentially-uninitialized mode variable in sem_open 2011-06-26 16:34:05 -04:00
sem_post.c report sem value overflows in sem_post 2011-10-26 00:28:47 -04:00
sem_timedwait.c fix sem_timedwait bug introduced in timedwait unification 2011-08-02 21:15:20 -04:00
sem_trywait.c overhaul posix semaphores to fix destructability race 2011-08-02 19:19:09 -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 remove everything related to forkall 2012-05-22 22:43:27 -04:00
syscall_cp.c overhaul pthread cancellation 2011-04-17 11:43:03 -04:00