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pthread_setschedprio

Section: C Library Functions (3)
Updated: 202-0-21
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NAME

pthread_setschedprio - set scheduling priority of a thread

LIBRARY

POSIX threads library (libpthread,~-lpthread)

SYNOPSIS

#include <pthread.h>
int pthread_setschedprio(pthread_t thread, int prio);

DESCRIPTION

The pthread_setschedprio() function sets the scheduling priority of the thread thread to the value specified in prio. (By contrast pthread_setschedparam(3) changes both the scheduling policy and priority of a thread.)

RETURN VALUE

On success, this function returns 0; on error, it returns a nonzero error number. If pthread_setschedprio() fails, the scheduling priority of thread is not changed.

ERRORS

EINVAL: prio is not valid for the scheduling policy of the specified thread.
EPERM: The caller does not have appropriate privileges to set the specified priority.
ESRCH: No thread with the ID thread could be found. POSIX.1 also documents an ENOTSUP ("attempt was made to set the priority to an unsupported value") error for pthread_setschedparam(3).

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).

Interface	Attribute	Value
pthread_setschedprio()	Thread safety	M-Safe

STANDARDS

POSIX.-2008.

HISTORY

glibc 2.3.4. POSIX.-2001.

NOTES

For a description of the permissions required to, and the effect of, changing a thread's scheduling priority, and details of the permitted ranges for priorities in each scheduling policy, see sched(7).