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74 lines
2.2 KiB
C
74 lines
2.2 KiB
C
/* Copyright (C) 2003, 2004, 2007, 2008 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <assert.h>
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#include <errno.h>
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#include <stdbool.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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#include <kernel-features.h>
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int
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pthread_condattr_setclock (attr, clock_id)
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pthread_condattr_t *attr;
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clockid_t clock_id;
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{
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/* Only a few clocks are allowed. CLOCK_REALTIME is always allowed.
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CLOCK_MONOTONIC only if the kernel has the necessary support. */
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if (clock_id == CLOCK_MONOTONIC)
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{
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#ifndef __ASSUME_POSIX_TIMERS
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# ifdef __NR_clock_getres
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/* Check whether the clock is available. */
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static int avail;
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if (avail == 0)
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{
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struct timespec ts;
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INTERNAL_SYSCALL_DECL (err);
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int val;
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val = INTERNAL_SYSCALL (clock_getres, err, 2, CLOCK_MONOTONIC, &ts);
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avail = INTERNAL_SYSCALL_ERROR_P (val, err) ? -1 : 1;
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}
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if (avail < 0)
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# endif
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/* Not available. */
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return EINVAL;
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#endif
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}
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else if (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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/* Make sure the value fits in the bits we reserved. */
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assert (clock_id < (1 << COND_NWAITERS_SHIFT));
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int *valuep = &((struct pthread_condattr *) attr)->value;
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*valuep = ((*valuep & ~(((1 << COND_NWAITERS_SHIFT) - 1) << 1))
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| (clock_id << 1));
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return 0;
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}
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