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/* ==== p_bench_semaphore.c =================================================
* Copyright (c) 1993 by Chris Provenzano, proven@athena.mit.edu
*
* Description : Benchmark semaphore Test and Set/ CLear times
*
* 1.00 93/11/08 proven
* -Started coding this file.
*/
#include <errno.h>
#include <pthread.h>
#include <stdio.h>
#define OK 0
#define NOTOK -1
/* ==========================================================================
* usage();
*/
void usage(void)
{
printf("getopt [-d?] [-c count]\n");
errno = 0;
}
main(int argc, char **argv)
{
struct timeval starttime, endtime;
semaphore lock = SEMAPHORE_CLEAR;
semaphore *lock_addr;
int count = 1000000;
int debug = 0;
int i;
char word[256];
/* Getopt variables. */
extern int optind, opterr;
extern char *optarg;
pthread_init();
while ((word[0] = getopt(argc, argv, "c:d?")) != (char)EOF) {
switch (word[0]) {
case 'd':
debug++;
break;
case 'c':
count = atoi(optarg);
break;
case '?':
usage();
return(OK);
default:
usage();
return(NOTOK);
}
}
lock_addr = &lock;
if (gettimeofday(&starttime, NULL)) {
perror ("gettimeofday");
return 1;
}
for (i = 0; i < count; i++) {
if (SEMAPHORE_TEST_AND_SET(lock_addr)) {
printf("Semaphore already locked error\n");
return 1;
}
SEMAPHORE_RESET(lock_addr);
}
if (gettimeofday(&endtime, NULL)) {
perror ("gettimeofday");
return 1;
}
printf("%d locks/unlocks of a semaphore took %d usecs.\n", count,
(endtime.tv_sec - starttime.tv_sec) * 1000000 +
(endtime.tv_usec - starttime.tv_usec));
return 0;
}
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