Multithreaded Programming Guide

Setting the Scheduling Policy

Use pthread_attr_setschedpolicy(3C) to set the scheduling policy. The POSIX standard specifies the scheduling policy values of SCHED_FIFO (first-in-first-out), SCHED_RR (round-robin), or SCHED_OTHER (an implementation-defined method). In the Solaris OS, SCHED_OTHER threads run in the traditional time-sharing (TS) scheduling class.

pthread_attr_setschedpolicy(3C) Syntax

int pthread_attr_setschedpolicy(pthread_attr_t *tattr, int policy);
#include <pthread.h> 
pthread_attr_t tattr; 
int policy; 
int ret; 

/* set the scheduling policy to SCHED_OTHER */ 
ret = pthread_attr_setschedpolicy(&tattr, SCHED_OTHER);

SCHED_FIFO and SCHED_RR are optional in the POSIX standard, and are supported for real-time threads only.

For a discussion of scheduling, see the section Thread Scheduling.

pthread_attr_setschedpolicy Return Values

pthread_attr_setschedpolicy() returns zero after completing successfully. Any other return value indicates that an error occurred. When either of the following conditions occurs, the function fails and returns the corresponding value.



An attempt was made to set tattr to a value that is not valid.



An attempt was made to set the attribute to an unsupported value.