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86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
/* pthread_mutex_trylock. Hurd version.
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Copyright (C) 2016-2024 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 <pthread.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <pt-internal.h>
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#include "pt-mutex.h"
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#include <hurdlock.h>
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int
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__pthread_mutex_trylock (pthread_mutex_t *mtxp)
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{
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struct __pthread *self;
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int ret;
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switch (MTX_TYPE (mtxp))
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{
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case PT_MTX_NORMAL:
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ret = lll_trylock (mtxp->__lock);
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if (ret)
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ret = EBUSY;
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break;
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case PT_MTX_RECURSIVE:
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self = _pthread_self ();
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if (mtx_owned_p (mtxp, self, mtxp->__flags))
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{
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if (__glibc_unlikely (mtxp->__cnt + 1 == 0))
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return EAGAIN;
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++mtxp->__cnt;
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ret = 0;
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}
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else if ((ret = lll_trylock (mtxp->__lock)) == 0)
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{
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mtx_set_owner (mtxp, self, mtxp->__flags);
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mtxp->__cnt = 1;
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}
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else
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ret = EBUSY;
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break;
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case PT_MTX_ERRORCHECK:
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self = _pthread_self ();
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if ((ret = lll_trylock (mtxp->__lock)) == 0)
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mtx_set_owner (mtxp, self, mtxp->__flags);
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else
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ret = EBUSY;
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break;
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case PT_MTX_NORMAL | PTHREAD_MUTEX_ROBUST:
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case PT_MTX_RECURSIVE | PTHREAD_MUTEX_ROBUST:
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case PT_MTX_ERRORCHECK | PTHREAD_MUTEX_ROBUST:
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self = _pthread_self ();
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ROBUST_LOCK (self, mtxp, lll_robust_trylock);
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break;
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default:
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ret = EINVAL;
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break;
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}
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return ret;
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}
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hidden_def (__pthread_mutex_trylock)
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strong_alias (__pthread_mutex_trylock, _pthread_mutex_trylock)
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weak_alias (__pthread_mutex_trylock, pthread_mutex_trylock)
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