mirror of
https://github.com/fluencelabs/musl
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400c5e5c83
to deal with the fact that the public headers may be used with pre-c99 compilers, __restrict is used in place of restrict, and defined appropriately for any supported compiler. we also avoid the form [restrict] since older versions of gcc rejected it due to a bug in the original c99 standard, and instead use the form *restrict.
77 lines
1.6 KiB
C
77 lines
1.6 KiB
C
#include "pthread_impl.h"
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struct cm {
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pthread_cond_t *c;
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pthread_mutex_t *m;
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};
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static void unwait(pthread_cond_t *c, pthread_mutex_t *m)
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{
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/* Removing a waiter is non-trivial if we could be using requeue
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* based broadcast signals, due to mutex access issues, etc. */
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if (c->_c_mutex == (void *)-1) {
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a_dec(&c->_c_waiters);
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if (c->_c_destroy) __wake(&c->_c_waiters, 1, 0);
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return;
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}
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while (a_swap(&c->_c_lock, 1))
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__wait(&c->_c_lock, &c->_c_lockwait, 1, 1);
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if (c->_c_waiters2) c->_c_waiters2--;
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else a_dec(&m->_m_waiters);
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a_store(&c->_c_lock, 0);
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if (c->_c_lockwait) __wake(&c->_c_lock, 1, 1);
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a_dec(&c->_c_waiters);
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if (c->_c_destroy) __wake(&c->_c_waiters, 1, 1);
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}
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static void cleanup(void *p)
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{
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struct cm *cm = p;
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unwait(cm->c, cm->m);
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pthread_mutex_lock(cm->m);
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}
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int pthread_cond_timedwait(pthread_cond_t *restrict c, pthread_mutex_t *restrict m, const struct timespec *restrict ts)
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{
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struct cm cm = { .c=c, .m=m };
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int r, e=0, seq;
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if (m->_m_type && (m->_m_lock&INT_MAX) != pthread_self()->tid)
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return EPERM;
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if (ts && ts->tv_nsec >= 1000000000UL)
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return EINVAL;
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pthread_testcancel();
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a_inc(&c->_c_waiters);
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if (c->_c_mutex != (void *)-1) {
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c->_c_mutex = m;
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while (a_swap(&c->_c_lock, 1))
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__wait(&c->_c_lock, &c->_c_lockwait, 1, 1);
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c->_c_waiters2++;
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a_store(&c->_c_lock, 0);
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if (c->_c_lockwait) __wake(&c->_c_lock, 1, 1);
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}
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seq = c->_c_seq;
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pthread_mutex_unlock(m);
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do e = __timedwait(&c->_c_seq, seq, c->_c_clock, ts, cleanup, &cm, 0);
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while (c->_c_seq == seq && (!e || e==EINTR));
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if (e == EINTR) e = 0;
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unwait(c, m);
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if ((r=pthread_mutex_lock(m))) return r;
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return e;
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}
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