Section: POSIX Programmer's Manual (3P)
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
--- dynamic thread scheduling parameters access
int pthread_setschedprio(pthread_t thread, int prio);
function shall set the scheduling priority for the thread whose thread
ID is given by
to the value given by
for a description on how this function call affects the ordering of the
thread in the thread list for its new priority.
function fails, the scheduling priority of the target thread shall not
If successful, the
function shall return zero; otherwise, an error number shall be
returned to indicate the error.
function may fail if:
The value of
is invalid for the scheduling policy of the specified thread.
The caller does not have appropriate privileges to set the scheduling
priority of the specified thread.
function shall not return an error code of
The following sections are informative.
function provides a way for an application to temporarily raise its
priority and then lower it again, without having the undesired
side-effect of yielding to other threads of the same priority. This is
necessary if the application is to implement its own strategies for
bounding priority inversion, such as priority inheritance or priority
ceilings. This capability is especially important if the implementation
does not support the Thread Priority Protection or Thread Priority
Inheritance options, but even if those options are supported it is
needed if the application is to bound priority inheritance for other
resources, such as semaphores.
The standard developers considered that while it might be preferable
conceptually to solve this problem by modifying the specification of
it was too late to make such a change, as there may be implementations
that would need to be changed. Therefore, this new function was
If an implementation detects use of a thread ID after the end of its
lifetime, it is recommended that the function should fail and report an
The Base Definitions volume of POSIX.1-2008,
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, Copyright (C) 2013 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group.
(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at
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