/usr/src/blcr-0.8.5/tests/critical_sections.c is in blcr-dkms 0.8.5-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Berkeley Lab Checkpoint/Restart (BLCR) for Linux is Copyright (c)
* 2008, The Regents of the University of California, through Lawrence
* Berkeley National Laboratory (subject to receipt of any required
* approvals from the U.S. Dept. of Energy). All rights reserved.
*
* Portions may be copyrighted by others, as may be noted in specific
* copyright notices within specific files.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* $Id: critical_sections.c,v 1.5 2008/07/26 06:38:15 phargrov Exp $
*/
const char description[] =
"Description of tests/CriticalSections/cr_test:\n"
"\n"
"This test verifies the behavior of critical sections in libcr:\n"
" + cr_enter_cs()\n"
" + Enters a critical section which excludes checkpoints, inclusive\n"
" of thread-context callbacks.\n"
" + cr_leave_cs()\n"
" Leaves a critical section, invoking a checkpoint if one is pending.\n"
" + cr_status()\n"
" Must reflect the status of the thread-context callback as well.\n"
"\n"
"In a successful run, expect lines of output in SORTED order.\n"
;
#include <sys/stat.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <sched.h>
#include <pthread.h>
#include "crut_util.h"
static pthread_mutex_t my_lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t my_cond = PTHREAD_COND_INITIALIZER;
static volatile int thread_ran = 0;
static int my_callback(void* arg)
{
int rc;
printf("004 enter callback\n");
rc = cr_checkpoint(CR_CHECKPOINT_READY);
if (rc) {
printf("XXX resuming unexpectedly in callback\n");
exit(-1);
} else {
printf("005 continuing correctly in callback\n");
}
pthread_mutex_lock(&my_lock);
thread_ran = 1;
pthread_cond_signal(&my_cond);
pthread_mutex_unlock(&my_lock);
return 0;
}
int main(void)
{
pid_t my_pid;
cr_callback_id_t cb_id;
cr_client_id_t my_id;
cr_checkpoint_handle_t my_handle;
char *filename = NULL;
struct stat s;
int rc, fd;
setlinebuf(stdout);
my_pid = getpid();
filename = crut_aprintf("context.%d", my_pid);
printf("000 Process started with pid %d\n", my_pid);
printf("#ST_ALARM:120\n");
my_id = cr_init();
if (my_id < 0) {
printf("XXX cr_init() failed\n");
exit(-1);
} else {
printf("001 cr_init() succeeded\n");
}
cb_id = cr_register_callback(my_callback, NULL, CR_THREAD_CONTEXT);
if (cb_id < 0) {
printf("XXX cr_register_callback() unexpectedly returned %d\n", cb_id);
exit(-1);
}
cr_enter_cs(my_id);
rc = cr_status();
if (rc != CR_STATE_IDLE) {
printf("XXX cr_status() unexpectedly returned %d\n", rc);
exit(-1);
} else {
printf("002 cr_status() correctly returned IDLE\n");
}
fd = crut_checkpoint_request(&my_handle, filename);
if (fd < 0) {
printf("XXX crut_checkpoint_request() unexpectedly returned %d\n", rc);
exit(-1);
} else {
printf("003 crut_checkpoint_request() correctly returned 0\n");
}
sleep(1);
if (thread_ran) {
printf("XXX thread ran unexpectedly in critical section\n");
exit(-1);
}
/* Wait for request to be pending */
while (cr_status() != CR_STATE_PENDING) {
sched_yield();
}
cr_leave_cs(my_id); // should allow checkpoint to start
pthread_mutex_lock(&my_lock);
while (!thread_ran) pthread_cond_wait(&my_cond, &my_lock);
pthread_mutex_unlock(&my_lock);
rc = crut_checkpoint_wait(&my_handle, fd);
if (rc < 0) {
printf("XXX crut_checkpoint_wait() unexpectedly returned %d errno=%d(%s)\n", rc, errno, cr_strerror(errno));
exit(-1);
}
rc = stat(filename, &s);
if (rc) {
printf("XXX stat() unexpectedly returned %d\n", rc);
exit(-1);
} else {
printf("006 stat(context.%d) correctly returned 0\n", my_pid);
}
if (s.st_size == 0) {
printf("XXX context file unexpectedly empty\n");
exit(-1);
} else {
printf("007 context.%d is non-empty\n", my_pid);
}
(void)unlink(filename); // might fail silently
printf("008 DONE\n");
return 0;
}
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