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

  A First-In-First-Out thread runs in the real-time (RT) scheduling class and require the calling process to be privileged. Such a thread, if not preempted by a higher priority thread, executes until it yields or blocks.

• SCHED_RR

  Round-Robin threads whose contention scope is system (PTHREAD_SCOPE_SYSTEM) are in real-time (RT) scheduling class if the calling process has an effective user id of 0. These threads, if not preempted by a higher priority thread, and if the threads do not yield or block, will execute for the system-determined time period. Use SCHED_RR for threads that have a contention scope of process (PTHREAD_SCOPE_PROCESS) is based on the TS scheduling class. Additionally, the calling process for these threads does not have an effective userid of 0.

  A Round-Robin thread runs in the real-time (RT) scheduling class and requires the calling process to be privileged. If a round robin thread is not preempted by a higher priority thread, and does not yield or block, it will execute for a system-determined time period. The thread is then forced to yield to another real time thread of equal priority.

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.