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/* Copyright (C) 2003, 2004, 2007, 2008 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, see <http://www.gnu.org/licenses/>. */ #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 ( 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_NWAITERS_SHIFT)); int *valuep = &((struct pthread_condattr *) attr)->value; *valuep = ((*valuep & ~(((1 << COND_NWAITERS_SHIFT) - 1) << 1)) | (clock_id << 1)); return 0; } |