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2313ab153d
Linux added FUTEX_LOCK_PI2 to support clock selection (commit bf22a6976897977b0a3f1aeba6823c959fc4fdae). With the new flag we can now proper support CLOCK_MONOTONIC for pthread_mutex_clocklock with Priority Inheritance. If kernel does not support, EINVAL is returned instead. The difference is the futex operation will be issued and the kernel will advertise the missing support (instead of hard-code error return). Checked on x86_64-linux-gnu and i686-linux-gnu on Linux 5.14, 5.11, and 4.15.
79 lines
2.3 KiB
C
79 lines
2.3 KiB
C
/* Check if pthread_mutex_clocklock with PRIO_INHERIT fails with clock
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different than CLOCK_REALTIME.
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Copyright (C) 2020-2021 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 <pthread.h>
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#include <errno.h>
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#include <array_length.h>
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#include <support/check.h>
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#include <support/xthread.h>
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#include <support/timespec.h>
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static int
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do_test (void)
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{
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const int types[] = {
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PTHREAD_MUTEX_NORMAL,
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PTHREAD_MUTEX_ERRORCHECK,
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PTHREAD_MUTEX_RECURSIVE,
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PTHREAD_MUTEX_ADAPTIVE_NP
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};
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const int robust[] = {
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PTHREAD_MUTEX_STALLED,
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PTHREAD_MUTEX_ROBUST
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};
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const struct {
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int clk;
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int r;
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} clocks[] = {
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{ CLOCK_REALTIME, 0 },
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{ CLOCK_MONOTONIC, 0 },
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{ CLOCK_REALTIME_COARSE, EINVAL }
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};
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for (int t = 0; t < array_length (types); t++)
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for (int r = 0; r < array_length (robust); r++)
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for (int c = 0; c < array_length (clocks); c++)
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{
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pthread_mutexattr_t attr;
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xpthread_mutexattr_init (&attr);
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xpthread_mutexattr_setprotocol (&attr, PTHREAD_PRIO_INHERIT);
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xpthread_mutexattr_settype (&attr, types[t]);
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xpthread_mutexattr_setrobust (&attr, robust[r]);
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pthread_mutex_t mtx;
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xpthread_mutex_init (&mtx, &attr);
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/* Uncontended case does not trigger any futex call. */
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struct timespec tmo = timespec_add (xclock_now (clocks[c].clk),
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make_timespec (0, 100000000));
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TEST_COMPARE (pthread_mutex_clocklock (&mtx, clocks[c].clk, &tmo),
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clocks[c].r);
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if (clocks[c].r == 0)
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TEST_COMPARE (pthread_mutex_unlock (&mtx), 0);
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xpthread_mutex_destroy (&mtx);
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}
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return 0;
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}
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#include <support/test-driver.c>
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