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37 lines
1.2 KiB
C
37 lines
1.2 KiB
C
/* Returns whether Priority Inheritance support CLOCK_MONOTONIC.
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Copyright (C) 2021 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 <support/xthread.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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bool
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support_mutex_pi_monotonic (void)
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{
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#ifdef __linux__
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# ifndef __NR_futex
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# define __NR_futex __NR_futex_time64
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# endif
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int r = syscall (__NR_futex, &(unsigned int){0}, 13 /* FUTEX_LOCK_PI2 */,
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0, NULL);
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return r == 0;
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#else
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return false;
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#endif
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}
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