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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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PTHREAD_...CHEDPRIO(3P) POSIX Programmer's Manual PTHREAD_...CHEDPRIO(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.
pthread_setschedprio — dynamic thread scheduling parameters access
(REALTIME THREADS)
#include <pthread.h>
int pthread_setschedprio(pthread_t thread, int prio);
The pthread_setschedprio() function shall set the scheduling
priority for the thread whose thread ID is given by thread to the
value given by prio. See Scheduling Policies for a description on
how this function call affects the ordering of the thread in the
thread list for its new priority.
If the pthread_setschedprio() function fails, the scheduling
priority of the target thread shall not be changed.
If successful, the pthread_setschedprio() function shall return
zero; otherwise, an error number shall be returned to indicate the
error.
The pthread_setschedprio() function may fail if:
EINVAL The value of prio is invalid for the scheduling policy of
the specified thread.
EPERM The caller does not have appropriate privileges to set the
scheduling priority of the specified thread.
The pthread_setschedprio() function shall not return an error code
of [EINTR].
The following sections are informative.
None.
None.
The pthread_setschedprio() 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 pthread_setschedparam(), 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 introduced.
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 [ESRCH] error.
None.
Scheduling Policies, pthread_getschedparam(3p)
The Base Definitions volume of POSIX.1‐2017, pthread.h(0p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 by the Institute of Electrical and Electronics Engineers,
Inc and The Open Group. 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
http://www.opengroup.org/unix/online.html .
Any typographical or formatting errors that appear in this page
are most likely to have been introduced during the conversion of
the source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2017 PTHREAD_...CHEDPRIO(3P)
Pages that refer to this page: pthread.h(0p), pthread_getschedparam(3p)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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