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51 lines
1.7 KiB
C
51 lines
1.7 KiB
C
/* Copyright (C) 2003-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
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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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<http://www.gnu.org/licenses/>. */
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#include <assert.h>
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#include <errno.h>
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#include <futex-internal.h>
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#include <time.h>
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#include <sysdep.h>
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#include "pthreadP.h"
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int
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pthread_condattr_setclock (pthread_condattr_t *attr, clockid_t clock_id)
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{
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/* Only a few clocks are allowed. */
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if (clock_id != CLOCK_MONOTONIC && clock_id != CLOCK_REALTIME)
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/* If more clocks are allowed some day the storing of the clock ID
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in the pthread_cond_t structure needs to be adjusted. */
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return EINVAL;
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/* If we do not support waiting using CLOCK_MONOTONIC, return an error. */
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if (clock_id == CLOCK_MONOTONIC
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&& !futex_supports_exact_relative_timeouts())
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return ENOTSUP;
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/* Make sure the value fits in the bits we reserved. */
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assert (clock_id < (1 << COND_CLOCK_BITS));
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int *valuep = &((struct pthread_condattr *) attr)->value;
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*valuep = ((*valuep & ~(((1 << COND_CLOCK_BITS) - 1) << 1))
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| (clock_id << 1));
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return 0;
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}
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