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/* pthread_condattr_setclock. Generic version.
Copyright (C) 2002-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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
<https://www.gnu.org/licenses/>. */
#include <pthread.h>
#include <pt-internal.h>
int
pthread_condattr_setclock (pthread_condattr_t *attr, clockid_t clock)
{
/* Only a few clocks are allowed. CLOCK_REALTIME is always allowed.
CLOCK_MONOTONIC only if the kernel has the necessary support. */
if (clock == CLOCK_MONOTONIC)
{
/* Check whether the clock is available. */
static int avail;
if (avail == 0)
{
struct timespec ts;
int res;
res = clock_gettime (CLOCK_MONOTONIC, &ts);
avail = res < 0 ? -1 : 1;
}
if (avail < 0)
/* Not available. */
return EINVAL;
}
else if (clock != CLOCK_REALTIME)
return EINVAL;
attr->__clock = clock;
return 0;
}
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