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/* ==== 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>
#define OK 0
#define NOTOK -1
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(void* arg)
{
while(1) {
write (fd, (char *) arg, 1);
x[(char *)arg - buf] = 1;
}
fprintf(stderr, "Compiler error\n");
exit(1);
}
main(int argc, char **argv)
{
pthread_t thread;
int count = 2;
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);
}
for (i = 0; i < count; i++) {
if (pthread_create(&thread, NULL, new_thread, (void*)(buf+i))) {
fprintf (stderr, "error creating new thread %d\n", i);
exit (1);
}
}
#if 0 /* This would cause the program to loop forever, and "make
check" would never complete. */
pthread_exit (NULL);
fprintf(stderr, "pthread_exit returned\n");
exit(1);
#else
sleep (10);
for (i = 0; i < count; i++)
if (x[i] == 0) {
fprintf (stderr, "thread %d never ran\n", i);
return 1;
}
printf ("\n%s PASSED\n", argv[0]);
return 0;
#endif
}
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