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major semaphore improvements (performance and correctness)

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1. make sem_[timed]wait interruptible by signals, per POSIX
2. keep a waiter count in order to avoid unnecessary futex wake syscalls
This commit is contained in:
Rich Felker 2011-04-06 12:24:34 -04:00
commit a113434cd6
5 changed files with 37 additions and 21 deletions
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3
src/thread/pthread_cond_timedwait.c
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@ -16,7 +16,8 @@ int pthread_cond_timedwait(pthread_cond_t *c, pthread_mutex_t *m, const struct t
if ((r=pthread_mutex_unlock(m))) return r;
CANCELPT_BEGIN;
e = __timedwait(&c->_c_block, 1, c->_c_clock, ts, 0);
do e = __timedwait(&c->_c_block, 1, c->_c_clock, ts, 0);
while (e == EINTR);
CANCELPT_END;
pthread_cleanup_pop(0);