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- /* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
- #include <assert.h>
- #include <errno.h>
- #include <stdbool.h>
- #include <time.h>
- #include <sysdep.h>
- #include "pthreadP.h"
- #include <bits/kernel-features.h>
- int
- pthread_condattr_setclock (attr, clock_id)
- pthread_condattr_t *attr;
- clockid_t clock_id;
- {
- /* Only a few clocks are allowed. CLOCK_REALTIME is always allowed.
- CLOCK_MONOTONIC only if the kernel has the necessary support. */
- if (clock_id == CLOCK_MONOTONIC)
- {
- #ifndef __ASSUME_POSIX_TIMERS
- # ifdef __NR_clock_getres
- /* Check whether the clock is available. */
- static int avail;
- if (avail == 0)
- {
- struct timespec ts;
- INTERNAL_SYSCALL_DECL (err);
- int val;
- val = INTERNAL_SYSCALL (clock_getres, err, 2, CLOCK_MONOTONIC, &ts);
- avail = INTERNAL_SYSCALL_ERROR_P (val, err) ? -1 : 1;
- }
- if (avail < 0)
- # endif
- /* Not available. */
- return EINVAL;
- #endif
- }
- else if (clock_id != CLOCK_REALTIME)
- /* If more clocks are allowed some day the storing of the clock ID
- in the pthread_cond_t structure needs to be adjusted. */
- return EINVAL;
- /* Make sure the value fits in the bits we reserved. */
- assert (clock_id < (1 << COND_CLOCK_BITS));
- int *valuep = &((struct pthread_condattr *) attr)->value;
- *valuep = (*valuep & ~(1 << (COND_CLOCK_BITS + 1)) & ~1) | (clock_id << 1);
- return 0;
- }
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