1 /* setidle.c: tell kernel to use SCHED_IDLE policy for an existing process 2 and its future descendents. These background processes run only when some 3 cpu would otherwise be idle. The process's priority is never dynamically 4 escalated to the point where its I/O actions may compete with that of 5 higher priority work */ 6 7 #include <sched.h> 8 #include <errno.h> 9 #include <stdio.h> 10 11 #define SCHED_IDLE 6006 12 13 int main(int argc, char *argv[]) 14 { 15 int pid; 16 struct sched_param param = { 0 }; 17 18 if (argc != 2) { 19 printf("usage: %s pid\n", argv[0]); 20 return EINVAL; 21 } 22 23 pid = atoi(argv[1]); 24 25 if (sched_setscheduler(pid, SCHED_IDLE, ¶m) == -1) { 26 perror("error sched_setscheduler"); 27 return -1; 28 } 29 return 0; 30 } 31
