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synchronize cond var destruction with exiting waits
[oweals/musl.git]
/
src
/
thread
/
sem_post.c
1
#include <semaphore.h>
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#include "pthread_impl.h"
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int sem_post(sem_t *sem)
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{
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int val, waiters;
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do {
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val = sem->__val[0];
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waiters = sem->__val[1];
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} while (a_cas(sem->__val, val, val+1+(val<0)) != val);
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if (val<0 || waiters) __wake(sem->__val, 1, 0);
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return 0;
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}