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/* Make sure pthread_mutex_timedlock doesn't return spurious error codes.
Copyright (C) 2020-2024 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 <errno.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <support/check.h>
#include <support/timespec.h>
#include <support/xsignal.h>
#include <support/xthread.h>
#include <support/xtime.h>
#include <time.h>
#include <unistd.h>
#define NANO_PER_SEC 1000000000LL
#define TIMEOUT (NANO_PER_SEC / 1000LL)
#define NUM_THREADS 50
#define RETEST_TIMES 100
static pthread_mutex_t mutex;
static int runs;
static clockid_t clockid;
static void
signal_handler (int sig_num)
{
TEST_COMPARE (sig_num, SIGUSR1);
}
/* Call pthread_mutex_timedlock()/pthread_mutex_unlock() repetitively, hoping
that one of them returns EAGAIN or EINTR unexpectedly. */
static void *
worker_timedlock (void *arg)
{
for (unsigned int run = 0; run < runs; run++)
{
struct timespec abs_time = timespec_add (xclock_now (CLOCK_REALTIME),
make_timespec (0, 1000000));
int ret = pthread_mutex_timedlock (&mutex, &abs_time);
if (ret == 0)
xpthread_mutex_unlock (&mutex);
TEST_VERIFY_EXIT (ret == 0 || ret == ETIMEDOUT);
}
return NULL;
}
static void *
worker_clocklock (void *arg)
{
for (unsigned int run = 0; run < runs; run++)
{
struct timespec time =
timespec_add (xclock_now (clockid), make_timespec (0, 1000000));
int ret = pthread_mutex_clocklock (&mutex, clockid, &time);
if (ret == 0)
xpthread_mutex_unlock (&mutex);
TEST_VERIFY_EXIT (ret == 0 || ret == ETIMEDOUT);
}
return NULL;
}
static int
run_test_set (void *(*worker) (void *))
{
pthread_t workers[NUM_THREADS];
/* Check if default pthread_mutex_{timed,clock}lock with valid arguments
returns either 0 or ETIMEDOUT. Since there is no easy way to force
the error condition, the test creates multiple threads which in turn
issues pthread_mutex_timedlock multiple times. */
runs = 100;
for (int run = 0; run < RETEST_TIMES; run++)
{
for (int i = 0; i < NUM_THREADS; i++)
workers[i] = xpthread_create (NULL, worker, NULL);
for (int i = 0; i < NUM_THREADS; i++)
xpthread_join (workers[i]);
}
/* The idea is similar to previous tests, but we check if
pthread_mutex_{timed,clock}lock does not return EINTR. */
pthread_t thread;
runs = 1;
for (int i = 0; i < RETEST_TIMES * 1000; i++)
{
xpthread_mutex_lock (&mutex);
thread = xpthread_create (NULL, worker, NULL);
/* Sleep just a little bit to reach the lock on the worker thread. */
usleep (10);
pthread_kill (thread, SIGUSR1);
xpthread_mutex_unlock (&mutex);
xpthread_join (thread);
}
return 0;
}
static int
do_test (void)
{
xsignal (SIGUSR1, signal_handler);
xpthread_mutex_init (&mutex, NULL);
run_test_set (worker_timedlock);
clockid = CLOCK_REALTIME;
run_test_set (worker_clocklock);
clockid = CLOCK_MONOTONIC;
run_test_set (worker_clocklock);
return 0;
}
#include <support/test-driver.c>
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