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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | STANDARDS | HISTORY | NOTES | EXAMPLES | SEE ALSO | COLOPHON |
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pthread_a...chedparam(3) Library Functions Manualpthread_a...chedparam(3)
pthread_attr_setschedparam, pthread_attr_getschedparam - set/get
scheduling parameter attributes in thread attributes object
POSIX threads library (libpthread, -lpthread)
#include <pthread.h>
int pthread_attr_setschedparam(pthread_attr_t *restrict attr,
const struct sched_param *restrict param);
int pthread_attr_getschedparam(const pthread_attr_t *restrict attr,
struct sched_param *restrict param);
The pthread_attr_setschedparam() function sets the scheduling
parameter attributes of the thread attributes object referred to
by attr 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(7).
In order for the parameter setting made by
pthread_attr_setschedparam() to have effect when calling
pthread_create(3), the caller must use
pthread_attr_setinheritsched(3) to set the inherit-scheduler
attribute of the attributes object attr to PTHREAD_EXPLICIT_SCHED.
On success, these functions return 0; on error, they return a
nonzero error number.
pthread_attr_setschedparam() can fail with the following error:
EINVAL The priority specified in param does not make sense for the
current scheduling policy of attr.
POSIX.1 also documents an ENOTSUP error for
pthread_attr_setschedparam(). This value is never returned on
Linux (but portable and future-proof applications should
nevertheless handle this error return value).
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│ pthread_attr_setschedparam(), │ Thread safety │ MT-Safe │
│ pthread_attr_getschedparam() │ │ │
└──────────────────────────────────────┴───────────────┴─────────┘
POSIX.1-2008.
POSIX.1-2001. glibc 2.0.
See pthread_attr_setschedpolicy(3) for a list of the thread
scheduling policies supported on Linux.
See pthread_setschedparam(3).
sched_get_priority_min(2), pthread_attr_init(3),
pthread_attr_setinheritsched(3), pthread_attr_setschedpolicy(3),
pthread_create(3), pthread_setschedparam(3),
pthread_setschedprio(3), pthreads(7), sched(7)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.15 2025-05-17 pthread_a...chedparam(3)
Pages that refer to this page: pthread_attr_init(3), pthread_attr_setinheritsched(3), pthread_attr_setschedpolicy(3), pthread_attr_setscope(3), pthread_getattr_default_np(3), pthread_getattr_np(3), pthread_setschedparam(3), pthread_setschedprio(3)
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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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