NAME¶

pthread_attr_setschedparam, pthread_attr_getschedparam - set/get scheduling parameter attributes in thread attributes object

SYNOPSIS¶

#include <pthread.h>
int pthread_attr_setschedparam(pthread_attr_t *attr,
                               const struct sched_param *param);
int pthread_attr_getschedparam(pthread_attr_t *attr,
                               struct sched_param *param);

Compile and link with -pthread.

DESCRIPTION¶

The pthread_attr_setschedparam() function sets the scheduling parameter attributes of the thread attributes object referred to by thread to the values specified in the buffer pointed to by param. These attributes determine the scheduling parameters of a thread created using the thread attributes object attr.

The pthread_attr_getschedparam() returns the scheduling parameter attributes of the thread attributes object attr in the buffer pointed to by param.

Scheduling parameters are maintained in the following structure:

struct sched_param {


    int sched_priority;     /* Scheduling priority */
};

As can be seen, only one scheduling parameter is supported. For details of the permitted ranges for scheduling priorities in each scheduling policy, see sched_setscheduler(2).

RETURN VALUE¶

On success, these functions return 0; on error, they return a non-zero error number.

ERRORS¶

POSIX.1 documents EINVAL and ENOTSUP errors for pthread_attr_setschedparam(). On Linux these functions always succeed (but portable and future-proof applications should nevertheless handle a possible error return).

CONFORMING TO¶

POSIX.1-2001.

EXAMPLE¶

See pthread_setschedparam(3).

NOTES¶

See pthread_attr_setschedpolicy(3) for a list of the thread scheduling policies supported on Linux.

SEE ALSO¶

sched_get_priority_min(2), sched_setscheduler(2), pthread_attr_init(3), pthread_attr_setinheritsched(3), pthread_attr_setschedpolicy(3), pthread_create(3), pthread_setschedparam(3), pthread_setschedprio(3), pthreads(7)

COLOPHON¶

This page is part of release 3.22 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.