45 lines
1.4 KiB
C
45 lines
1.4 KiB
C
/*
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* Copyright (c) 2014, 2021 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* semaphore/sem_post.c
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* Unlock a semaphore.
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*/
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#include <sys/futex.h>
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#include <errno.h>
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#include <limits.h>
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#include <semaphore.h>
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#include <stdbool.h>
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#include <stddef.h>
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int sem_post(sem_t* sem)
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{
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while ( true )
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{
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int old = __atomic_load_n(&sem->value, __ATOMIC_SEQ_CST);
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if ( old == INT_MAX )
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return errno = EOVERFLOW, -1;
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int new = old == -1 ? 1 : old + 1;
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int waiters = __atomic_load_n(&sem->waiters, __ATOMIC_SEQ_CST);
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if ( !__atomic_compare_exchange_n(&sem->value, &old, new, false,
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__ATOMIC_SEQ_CST, __ATOMIC_RELAXED) )
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continue;
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if ( old == -1 || waiters )
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futex(&sem->value, FUTEX_WAKE, 1, NULL);
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return 0;
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}
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}
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