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c8f9421298
The implementation is extremely similar to the nptl implementation, but with slight differences in the futex interface. This fixes some of BZ 25521.
46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
/* Destroy a semaphore. Generic version.
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Copyright (C) 2005-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <semaphore.h>
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#include <errno.h>
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#include <pt-internal.h>
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int
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__sem_destroy (sem_t *sem)
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{
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struct new_sem *isem = (struct new_sem *) sem;
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if (
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#if __HAVE_64B_ATOMICS
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atomic_load_relaxed (&isem->data) >> SEM_NWAITERS_SHIFT
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#else
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atomic_load_relaxed (&isem->value) & SEM_NWAITERS_MASK
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|| isem->nwaiters
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#endif
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)
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/* There are threads waiting on *SEM. */
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{
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errno = EBUSY;
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return -1;
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}
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return 0;
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}
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strong_alias (__sem_destroy, sem_destroy);
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