mirror of
https://github.com/fluencelabs/musl
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29 lines
688 B
C
29 lines
688 B
C
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#include "pthread_impl.h"
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int pthread_mutex_trylock(pthread_mutex_t *m)
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{
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if (m->__type == PTHREAD_MUTEX_RECURSIVE) {
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pthread_t self = pthread_self();
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if (m->__owner == self) {
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if ((unsigned)m->__lock >= INT_MAX) return EAGAIN;
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a_inc(&m->__lock);
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return 0;
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}
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if (a_fetch_add(&m->__lock, 1)) {
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if (a_fetch_add(&m->__lock, -1)==1 && m->__waiters)
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__wake(&m->__lock, 1, 0);
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return EBUSY;
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}
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m->__owner = self;
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return 0;
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}
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if (a_xchg(&m->__lock, 1))
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if (m->__type == PTHREAD_MUTEX_ERRORCHECK
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&& m->__owner == pthread_self()) return EDEADLK;
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else return EBUSY;
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if (m->__type == PTHREAD_MUTEX_ERRORCHECK)
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m->__owner = pthread_self();
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return 0;
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}
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