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      1 /******************************************************************************
      2  *
      3  *   Copyright  International Business Machines  Corp., 2009
      4  *
      5  *   This program is free software;  you can redistribute it and/or modify
      6  *   it under the terms of the GNU General Public License as published by
      7  *   the Free Software Foundation; either version 2 of the License, or
      8  *   (at your option) any later version.
      9  *
     10  * DESCRIPTION
     11  *      Block on a futex and wait for timeout.
     12  *
     13  * AUTHOR
     14  *      Darren Hart <dvhart (at) linux.intel.com>
     15  *
     16  * HISTORY
     17  *      2009-Nov-6: Initial version by Darren Hart <dvhart (at) linux.intel.com>
     18  *
     19  *****************************************************************************/
     20 
     21 #include <errno.h>
     22 #include <getopt.h>
     23 #include <stdio.h>
     24 #include <stdlib.h>
     25 #include <string.h>
     26 #include <time.h>
     27 #include "futextest.h"
     28 #include "logging.h"
     29 
     30 static long timeout_ns = 100000;	/* 100us default timeout */
     31 
     32 void usage(char *prog)
     33 {
     34 	printf("Usage: %s\n", prog);
     35 	printf("  -c	Use color\n");
     36 	printf("  -h	Display this help message\n");
     37 	printf("  -t N	Timeout in nanoseconds (default: 100,000)\n");
     38 	printf("  -v L	Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n",
     39 	       VQUIET, VCRITICAL, VINFO);
     40 }
     41 
     42 int main(int argc, char *argv[])
     43 {
     44 	futex_t f1 = FUTEX_INITIALIZER;
     45 	struct timespec to;
     46 	int res, ret = RET_PASS;
     47 	int c;
     48 
     49 	while ((c = getopt(argc, argv, "cht:v:")) != -1) {
     50 		switch (c) {
     51 		case 'c':
     52 			log_color(1);
     53 			break;
     54 		case 'h':
     55 			usage(basename(argv[0]));
     56 			exit(0);
     57 		case 't':
     58 			timeout_ns = atoi(optarg);
     59 			break;
     60 		case 'v':
     61 			log_verbosity(atoi(optarg));
     62 			break;
     63 		default:
     64 			usage(basename(argv[0]));
     65 			exit(1);
     66 		}
     67 	}
     68 
     69 	printf("%s: Block on a futex and wait for timeout\n",
     70 	       basename(argv[0]));
     71 	printf("\tArguments: timeout=%ldns\n", timeout_ns);
     72 
     73 	/* initialize timeout */
     74 	to.tv_sec = 0;
     75 	to.tv_nsec = timeout_ns;
     76 
     77 	info("Calling futex_wait on f1: %u @ %p\n", f1, &f1);
     78 	res = futex_wait(&f1, f1, &to, FUTEX_PRIVATE_FLAG);
     79 	if (!res || errno != ETIMEDOUT) {
     80 		fail("futex_wait returned %d\n", ret < 0 ? errno : ret);
     81 		ret = RET_FAIL;
     82 	}
     83 
     84 	print_result(ret);
     85 	return ret;
     86 }
     87