139 lines
3.7 KiB
C
139 lines
3.7 KiB
C
/* Make sure pthread_mutex_timedlock doesn't return spurious error codes.
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Copyright (C) 2020-2022 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 <errno.h>
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#include <pthread.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <support/check.h>
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#include <support/timespec.h>
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#include <support/xsignal.h>
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#include <support/xthread.h>
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#include <support/xtime.h>
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#include <time.h>
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#include <unistd.h>
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#define NANO_PER_SEC 1000000000LL
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#define TIMEOUT (NANO_PER_SEC / 1000LL)
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#define NUM_THREADS 50
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#define RETEST_TIMES 100
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static pthread_mutex_t mutex;
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static int runs;
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static clockid_t clockid;
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static void
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signal_handler (int sig_num)
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{
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TEST_COMPARE (sig_num, SIGUSR1);
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}
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/* Call pthread_mutex_timedlock()/pthread_mutex_unlock() repetitively, hoping
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that one of them returns EAGAIN or EINTR unexpectedly. */
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static void *
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worker_timedlock (void *arg)
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{
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for (unsigned int run = 0; run < runs; run++)
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{
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struct timespec abs_time = timespec_add (xclock_now (CLOCK_REALTIME),
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make_timespec (0, 1000000));
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int ret = pthread_mutex_timedlock (&mutex, &abs_time);
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if (ret == 0)
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xpthread_mutex_unlock (&mutex);
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TEST_VERIFY_EXIT (ret == 0 || ret == ETIMEDOUT);
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}
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return NULL;
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}
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static void *
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worker_clocklock (void *arg)
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{
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for (unsigned int run = 0; run < runs; run++)
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{
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struct timespec time =
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timespec_add (xclock_now (clockid), make_timespec (0, 1000000));
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int ret = pthread_mutex_clocklock (&mutex, clockid, &time);
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if (ret == 0)
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xpthread_mutex_unlock (&mutex);
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TEST_VERIFY_EXIT (ret == 0 || ret == ETIMEDOUT);
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}
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return NULL;
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}
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static int
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run_test_set (void *(*worker) (void *))
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{
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pthread_t workers[NUM_THREADS];
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/* Check if default pthread_mutex_{timed,clock}lock with valid arguments
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returns either 0 or ETIMEDOUT. Since there is no easy way to force
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the error condition, the test creates multiple threads which in turn
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issues pthread_mutex_timedlock multiple times. */
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runs = 100;
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for (int run = 0; run < RETEST_TIMES; run++)
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{
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for (int i = 0; i < NUM_THREADS; i++)
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workers[i] = xpthread_create (NULL, worker, NULL);
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for (int i = 0; i < NUM_THREADS; i++)
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xpthread_join (workers[i]);
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}
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/* The idea is similar to previous tests, but we check if
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pthread_mutex_{timed,clock}lock does not return EINTR. */
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pthread_t thread;
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runs = 1;
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for (int i = 0; i < RETEST_TIMES * 1000; i++)
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{
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xpthread_mutex_lock (&mutex);
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thread = xpthread_create (NULL, worker, NULL);
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/* Sleep just a little bit to reach the lock on the worker thread. */
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usleep (10);
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pthread_kill (thread, SIGUSR1);
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xpthread_mutex_unlock (&mutex);
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xpthread_join (thread);
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}
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return 0;
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}
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static int
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do_test (void)
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{
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xsignal (SIGUSR1, signal_handler);
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xpthread_mutex_init (&mutex, NULL);
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run_test_set (worker_timedlock);
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clockid = CLOCK_REALTIME;
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run_test_set (worker_clocklock);
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clockid = CLOCK_MONOTONIC;
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run_test_set (worker_clocklock);
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return 0;
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}
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#include <support/test-driver.c>
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