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/******************************************************************************
*
* Copyright © International Business Machines Corp., 2009
*
* 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
*
* NAME
* futex_wait_wouldblock.c
*
* DESCRIPTION
* Test if FUTEX_WAIT op returns -EWOULDBLOCK if the futex value differs
* from the unexpected one.
*
* AUTHOR
* Gowrishankar <gowrishankar.m@in.ibm.com>
*
* HISTORY
* 2009-Nov-14: Initial version by Gowrishankar <gowrishankar.m@in.ibm.com>
*
*****************************************************************************/
#include <errno.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "futextest.h"
#define timeout_ns 100000
void usage(char *prog)
{
printf("Usage: %s\n", prog);
printf(" -c Use color\n");
printf(" -h Display this help message\n");
printf(" -v L Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n",
VQUIET, VCRITICAL, VINFO);
}
int main(int argc, char *argv[])
{
struct timespec to = {.tv_sec = 0, .tv_nsec = timeout_ns};
futex_t f1 = FUTEX_INITIALIZER;
int ret = 0;
int c;
while ((c = getopt(argc, argv, "cht:v:")) != -1) {
switch(c) {
case 'c':
futextest_use_color(1);
break;
case 'h':
usage(basename(argv[0]));
exit(0);
case 'v':
futextest_verbosity(atoi(optarg));
break;
default:
usage(basename(argv[0]));
exit(1);
}
}
printf("%s: Test the unexpected futex value in FUTEX_WAIT\n",
basename(argv[0]));
info("Calling futex_wait on f1: %u @ %p with val=%u\n", f1, &f1, f1+1);
ret = futex_wait(&f1, f1, &to, FUTEX_PRIVATE_FLAG);
if (ret < 0) {
ret = -errno;
if (ret == -EWOULDBLOCK)
ret = 0;
else
fail("returned error is not '%s' in FUTEX_WAIT, but '%s'\n", \
strerror(EWOULDBLOCK), strerror(errno));
} else {
fail("futex_wait returned %d\n", ret);
ret = -1;
}
printf("Result: %s\n", ret ? FAIL : PASS);
return ret;
}