c88d6dcb4f
Adds useful descriptions to ones that were lacking them, updates ones that were innacurate, etc.
54 lines
922 B
C
54 lines
922 B
C
/* vim: tabstop=4 noexpandtab shiftwidth=4
|
|
*
|
|
* Multitasking Thrasher
|
|
*
|
|
* Useful for testing that multitasking still works.
|
|
* Starts up a bunch of threads, lets them do stuff,
|
|
* cleans them up, etc.
|
|
*
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdint.h>
|
|
#include <syscall.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
|
|
int main(int argc, char ** argv) {
|
|
int nthreads = 2, base_pid = getpid(), npid = -1;
|
|
|
|
if (argc > 1) {
|
|
/* Read some arguments */
|
|
int c;
|
|
while ((c = getopt(argc, argv, "n:")) != -1) {
|
|
switch (c) {
|
|
case 'n':
|
|
nthreads = atoi(optarg);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
printf("I am pid %d\n", base_pid);
|
|
printf("Starting %d threads.\n", nthreads);
|
|
|
|
for (int i = 0; i < nthreads; ++i) {
|
|
int pid = fork();
|
|
if (!pid) {
|
|
while (1) {
|
|
printf("%c", i + 'A');
|
|
fflush(stdout);
|
|
}
|
|
} else {
|
|
npid = pid;
|
|
}
|
|
}
|
|
|
|
printf("Done.\n");
|
|
|
|
return 0;
|
|
}
|