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/* ==== p_bench_mutex.c =================================================
* Copyright (c) 1993-1995 by Chris Provenzano, proven@athena.mit.edu
*
* Description : Benchmark mutex lock and unlock times
*
* 1.00 93/11/08 proven
* -Started coding this file.
*/
#include <errno.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "test.h"
/* ==========================================================================
* usage();
*/
void usage(void)
{
printf("p_bench_yield [-d?] \\\n");
printf("\t[-c count] \\\n");
printf("\t[-C thread count] \\\n");
printf("\t[-O optimization level]\n");
errno = 0;
}
void *yield(void * arg)
{
int i, * count;
count = (int *)arg;
for (i = 0; i < *count; i++) {
pthread_yield();
}
return(NULL);
}
int
main(int argc, char **argv)
{
struct timeval starttime, endtime;
pthread_mutex_t lock;
pthread_attr_t attr;
pthread_t thread_id;
int thread_count = 1;
int optimization = 0;
int count = 1000000;
int i, debug = 0;
char word[256];
/* Getopt variables. */
extern int optind, opterr;
extern char *optarg;
while ((word[0] = getopt(argc, argv, "C:O:c:d?")) != (char)EOF) {
switch (word[0]) {
case 'C':
thread_count = atoi(optarg);
break;
case 'O':
optimization = atoi(optarg);
break;
case 'c':
count = atoi(optarg);
break;
case 'd':
debug++;
break;
case '?':
usage();
return(OK);
default:
usage();
return(NOTOK);
}
}
pthread_attr_init(&attr);
#ifdef SCHED_FIFO /* XXX */
if (optimization > 0) {
pthread_attr_setschedpolicy(&attr, SCHED_FIFO);
}
#endif
#if 0 /* XXX */
if (optimization > 1) {
pthread_attr_setfloatstate(&attr, PTHREAD_NOFLOAT);
}
#endif
pthread_mutex_init(&lock, NULL);
if (gettimeofday(&starttime, NULL)) {
perror ("gettimeofday");
return 1;
}
for (i = 1; i < thread_count; i++) {
if (pthread_create(&thread_id, &attr, yield, &count)) {
perror ("pthread_create");
return 1;
}
if (pthread_detach(thread_id)) {
perror ("pthread_detach");
return 1;
}
}
if (pthread_create(&thread_id, &attr, yield, &count)) {
perror ("pthread_create");
return 1;
}
if (pthread_join(thread_id, NULL)) {
perror ("pthread_join");
return 1;
}
if (gettimeofday(&endtime, NULL)) {
perror ("gettimeofday");
return 1;
}
printf("%d pthread_yields took %ld usecs.\n", count,
(endtime.tv_sec - starttime.tv_sec) * 1000000 +
(endtime.tv_usec - starttime.tv_usec));
return 0;
}
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