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/* test-schedbatch.c - Create a process using SCHED_BATCH scheduler
* policy and nice value.
* Compile: gcc -o test-schedbatch -Wall test-schedbatch.c
* Usage: ./test-schedbatch [ <NICE> ]
*
* Author: Mike Fleetwood
* https://bugzilla.redhat.com/show_bug.cgi?id=741090
*/
#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <sched.h>
#include <sys/time.h>
#include <sys/resource.h>
/* Defined in Linux headers only */
#ifndef SCHED_BATCH
#define SCHED_BATCH 3
#endif
int main(int argc, const char *argv[])
{
int nice = 19;
struct sched_param sp;
char msg[50];
if (argc >= 2) {
nice = atoi(argv[1]);
}
sp.sched_priority = 0;
#ifdef SCHED_BATCH
if (sched_setscheduler(0, SCHED_BATCH, &sp)) {
perror("sched_setscheduler(0,SCHED_BATCH,{.sched_priority=0}");
}
#endif /* SCHED_BATCH */
if (setpriority(PRIO_PROCESS, 0, nice) || errno) {
(void)snprintf(msg, sizeof(msg),
"setpriority(PRIO_PROCESS, 0, %d)", nice);
perror(msg);
}
while (1) {
getchar();
}
}
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