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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...EDPOLICY(3P) POSIX Programmer's Manual PTHREAD...EDPOLICY(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_attr_getschedpolicy, pthread_attr_setschedpolicy — get and
set the schedpolicy attribute (REALTIME THREADS)
#include <pthread.h>
int pthread_attr_getschedpolicy(const pthread_attr_t *restrict attr,
int *restrict policy);
int pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy);
The pthread_attr_getschedpolicy() and
pthread_attr_setschedpolicy() functions, respectively, shall get
and set the schedpolicy attribute in the attr argument.
The supported values of policy shall include SCHED_FIFO, SCHED_RR,
and SCHED_OTHER, which are defined in the <sched.h> header. When
threads executing with the scheduling policy SCHED_FIFO, SCHED_RR,
or SCHED_SPORADIC are waiting on a mutex, they shall acquire the
mutex in priority order when the mutex is unlocked.
The behavior is undefined if the value specified by the attr
argument to pthread_attr_getschedpolicy() or
pthread_attr_setschedpolicy() does not refer to an initialized
thread attributes object.
If successful, the pthread_attr_getschedpolicy() and
pthread_attr_setschedpolicy() functions shall return zero;
otherwise, an error number shall be returned to indicate the
error.
The pthread_attr_setschedpolicy() function shall fail if:
ENOTSUP
An attempt was made to set the attribute to an unsupported
value.
The pthread_attr_setschedpolicy() function may fail if:
EINVAL The value of policy is not valid.
These functions shall not return an error code of [EINTR].
The following sections are informative.
None.
After these attributes have been set, a thread can be created with
the specified attributes using pthread_create(). Using these
routines does not affect the current running thread.
See Section 2.9.4, Thread Scheduling for further details on thread
scheduling attributes and their default settings.
If an implementation detects that the value specified by the attr
argument to pthread_attr_getschedpolicy() or
pthread_attr_setschedpolicy() does not refer to an initialized
thread attributes object, it is recommended that the function
should fail and report an [EINVAL] error.
None.
pthread_attr_destroy(3p), pthread_attr_getscope(3p),
pthread_attr_getinheritsched(3p), pthread_attr_getschedparam(3p),
pthread_create(3p)
The Base Definitions volume of POSIX.1‐2017, pthread.h(0p),
sched.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...EDPOLICY(3P)
Pages that refer to this page: pthread.h(0p), pthread_attr_getinheritsched(3p), pthread_attr_getschedparam(3p), pthread_attr_getscope(3p), pthread_attr_setschedpolicy(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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