| /* 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, 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 <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_NWAITERS_SHIFT)); |
| |
| int *valuep = &((struct pthread_condattr *) attr)->value; |
| |
| *valuep = ((*valuep & ~(((1 << COND_NWAITERS_SHIFT) - 1) << 1)) |
| | (clock_id << 1)); |
| |
| return 0; |
| } |