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52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
/* pthread_condattr_setclock. Generic version.
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Copyright (C) 2002-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <pthread.h>
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#include <pt-internal.h>
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int
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pthread_condattr_setclock (pthread_condattr_t *attr, clockid_t clock)
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{
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/* Only a few clocks are allowed. CLOCK_REALTIME is always allowed.
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CLOCK_MONOTONIC only if the kernel has the necessary support. */
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if (clock == CLOCK_MONOTONIC)
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{
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/* Check whether the clock is available. */
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static int avail;
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if (avail == 0)
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{
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struct timespec ts;
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int res;
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res = clock_gettime (CLOCK_MONOTONIC, &ts);
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avail = res < 0 ? -1 : 1;
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}
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if (avail < 0)
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/* Not available. */
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return EINVAL;
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}
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else if (clock != CLOCK_REALTIME)
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return EINVAL;
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attr->__clock = clock;
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return 0;
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}
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