diff options
author | "Steven J. Hill" <sjhill@realitydiluted.com> | 2005-05-07 02:04:55 +0000 |
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committer | "Steven J. Hill" <sjhill@realitydiluted.com> | 2005-05-07 02:04:55 +0000 |
commit | 0b3366f6a93ac0f7e2028745ea557c0acd8722c6 (patch) | |
tree | 2a87cb353c106eb55a44437d3b4d5e0d60af1d36 /libpthread/nptl/pthread_condattr_setclock.c | |
parent | 2274f6b2ddc7d7ea919a8fa1f9c54ef1920cb180 (diff) |
Import in NPTL code from glibc. For further information please
consult the 'README.NPTL' file.
Diffstat (limited to 'libpthread/nptl/pthread_condattr_setclock.c')
-rw-r--r-- | libpthread/nptl/pthread_condattr_setclock.c | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/libpthread/nptl/pthread_condattr_setclock.c b/libpthread/nptl/pthread_condattr_setclock.c new file mode 100644 index 000000000..04e246b74 --- /dev/null +++ b/libpthread/nptl/pthread_condattr_setclock.c @@ -0,0 +1,72 @@ +/* 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 <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; +} |