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/* $OpenBSD: test_switch.c,v 1.6 2000/01/06 06:58:35 d Exp $ */
/* ==== test_switch.c ========================================================
* Copyright (c) 1993 by Chris Provenzano, proven@athena.mit.edu
*
* Description : Test context switch functionality.
*
* 1.00 93/08/04 proven
* -Started coding this file.
*/
#include <pthread.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include "test.h"
const char buf[] = "abcdefghijklmnopqrstuvwxyz";
char x[sizeof(buf)];
int fd = 1;
/* ==========================================================================
* usage();
*/
void usage(void)
{
printf("test_switch [-d?] [-c count]\n");
printf("count must be between 2 and 26\n");
errno = 0;
}
void *
new_thread(arg)
void *arg;
{
SET_NAME("writer");
while(1) {
CHECKe(write (fd, (char *) arg, 1));
x[(char *)arg - buf] = 1;
}
PANIC("while");
}
int
main(argc, argv)
int argc;
char **argv;
{
pthread_t thread;
int count = 4;
int debug = 0;
int eof = 0;
long i;
/* Getopt variables. */
extern int optind, opterr;
extern char *optarg;
while (!eof)
switch (getopt (argc, argv, "c:d?"))
{
case EOF:
eof = 1;
break;
case 'd':
debug++;
break;
case 'c':
count = atoi(optarg);
if ((count > 26) || (count < 2)) {
count = 2;
}
break;
case '?':
usage();
return(OK);
default:
usage();
return(NOTOK);
}
/* create the threads */
for (i = 0; i < count; i++)
CHECKr(pthread_create(&thread, NULL, new_thread,
(void*)(buf+i)));
/* give all threads a chance to run */
sleep (4);
for (i = 0; i < count; i++)
ASSERT(x[i]); /* make sure each thread ran */
SUCCEED;
}
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