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Redesigned how cancellation unblocks a thread from internal cancellation points (sem_wait, pthread_join, pthread_cond_{wait,timedwait}). Cancellation won't eat a signal in any of these functions (*required* by POSIX and Single Unix Spec!).

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2000-01-03  Kaz Kylheku  <kaz@ashi.footprints.net>

	Redesigned how cancellation unblocks a thread from internal
	cancellation points (sem_wait, pthread_join,
	pthread_cond_{wait,timedwait}).
	Cancellation won't eat a signal in any of these functions
	(*required* by POSIX and Single Unix Spec!).
	* condvar.c: spontaneous wakeup on pthread_cond_timedwait won't eat a
	simultaneous condition variable signal (not required by POSIX
	or Single Unix Spec, but nice).
	* spinlock.c: __pthread_lock queues back any received restarts
	that don't belong to it instead of assuming ownership of lock
	upon any restart; fastlock can no longer be acquired by two threads
	simultaneously.
	* restart.h: restarts queue even on kernels that don't have
	queued real time signals (2.0, early 2.1), thanks to atomic counter,
	avoiding a rare race condition in pthread_cond_timedwait.
This commit is contained in:
Ulrich Drepper
2000-01-05 02:09:12 +00:00
parent f19f2b3443
commit 1d2fc9b3c5
14 changed files with 719 additions and 107 deletions
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5
linuxthreads/queue.h
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@@ -43,13 +43,14 @@ static inline pthread_descr dequeue(pthread_descr * q)
return th;
}
static inline void remove_from_queue(pthread_descr * q, pthread_descr th)
static inline int remove_from_queue(pthread_descr * q, pthread_descr th)
{
for (; *q != NULL; q = &((*q)->p_nextwaiting)) {
if (*q == th) {
*q = th->p_nextwaiting;
th->p_nextwaiting = NULL;
return;
return 1;
}
}
return 0;
}