104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
/* C11 threads timed mutex tests.
|
|
Copyright (C) 2018-2019 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
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <threads.h>
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
|
|
#include <support/check.h>
|
|
|
|
/* Shared mutex between child and parent. */
|
|
static mtx_t mutex;
|
|
|
|
/* Shared counter to check possible race conditions. */
|
|
static char shrd_counter;
|
|
|
|
/* Maximum amount of time waiting for mutex. */
|
|
static struct timespec wait_time;
|
|
|
|
/* Function to choose an action to do, depending on mtx_timedlock
|
|
return value. */
|
|
static inline void
|
|
choose_action (int action, char* thread_name)
|
|
{
|
|
switch (action)
|
|
{
|
|
case thrd_success:
|
|
++shrd_counter;
|
|
|
|
if (mtx_unlock (&mutex) != thrd_success)
|
|
FAIL_EXIT1 ("mtx_unlock failed");
|
|
break;
|
|
|
|
case thrd_timedout:
|
|
break;
|
|
|
|
case thrd_error:
|
|
FAIL_EXIT1 ("%s lock error", thread_name);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int
|
|
child_add (void *arg)
|
|
{
|
|
char child_name[] = "child";
|
|
|
|
/* Try to lock mutex. */
|
|
choose_action (mtx_timedlock (&mutex, &wait_time), child_name);
|
|
thrd_exit (thrd_success);
|
|
}
|
|
|
|
static int
|
|
do_test (void)
|
|
{
|
|
thrd_t id;
|
|
char parent_name[] = "parent";
|
|
|
|
if (mtx_init (&mutex, mtx_timed) != thrd_success)
|
|
FAIL_EXIT1 ("mtx_init failed");
|
|
|
|
if (clock_gettime (CLOCK_REALTIME, &wait_time) != 0)
|
|
FAIL_EXIT1 ("clock_gettime failed");
|
|
/* Tiny amount of time, to assure that if any thread finds it busy.
|
|
It will receive thrd_timedout. */
|
|
wait_time.tv_nsec += 1;
|
|
if (wait_time.tv_nsec == 1000 * 1000 * 1000)
|
|
{
|
|
wait_time.tv_sec += 1;
|
|
wait_time.tv_nsec = 0;
|
|
}
|
|
|
|
if (thrd_create (&id, child_add, NULL) != thrd_success)
|
|
FAIL_EXIT1 ("thrd_create failed");
|
|
|
|
choose_action (mtx_timedlock (&mutex, &wait_time), parent_name);
|
|
|
|
if (thrd_join (id, NULL) != thrd_success)
|
|
FAIL_EXIT1 ("thrd_join failed");
|
|
|
|
if (shrd_counter != 2 && shrd_counter != 1)
|
|
FAIL_EXIT1 ("shrd_counter != {1,2} (%d)", shrd_counter);
|
|
|
|
mtx_destroy (&mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#include <support/test-driver.c>
|