Setting the Thread Policy and Scheduling Parameters

Use pthread_setschedparam(3C) to modify the scheduling policy and scheduling parameters of an individual thread.

pthread_setschedparam Syntax

int pthread_setschedparam(pthread_t tid, int  policy,
    const struct sched_param *param);

#include <pthread.h>

pthread_t tid;
int ret;
struct sched_param param;
int priority;

/* sched_priority will be the priority of the thread */
sched_param.sched_priority = priority;
policy = SCHED_OTHER;

/* scheduling parameters of target thread */
ret = pthread_setschedparam(tid, 
policy, &param); 

Supported policies are SCHED_FIFO, SCHED_RR, and SCHED_OTHER.

pthread_setschedparam Return Values

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

EINVAL

Description:

The value of the attribute being set is not valid.

EPERM

Description:

The caller does not have the appropriate permission to set either the scheduling parameters or the scheduling policy of the specified thread.

ESRCH

Description:

The value specified by tid does not refer to an existing thread.