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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_...HEDPARAM(3P) POSIX Programmer's Manual PTHREAD_...HEDPARAM(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_getschedparam, pthread_attr_setschedparam — get and
set the schedparam attribute
#include <pthread.h>
int pthread_attr_getschedparam(const pthread_attr_t *restrict attr,
struct sched_param *restrict param);
int pthread_attr_setschedparam(pthread_attr_t *restrict attr,
const struct sched_param *restrict param);
The pthread_attr_getschedparam() and pthread_attr_setschedparam()
functions, respectively, shall get and set the scheduling
parameter attributes in the attr argument. The contents of the
param structure are defined in the <sched.h> header. For the
SCHED_FIFO and SCHED_RR policies, the only required member of
param is sched_priority.
For the SCHED_SPORADIC policy, the required members of the param
structure are sched_priority, sched_ss_low_priority,
sched_ss_repl_period, sched_ss_init_budget, and sched_ss_max_repl.
The specified sched_ss_repl_period must be greater than or equal
to the specified sched_ss_init_budget for the function to succeed;
if it is not, then the function shall fail. The value of
sched_ss_max_repl shall be within the inclusive range
[1,{SS_REPL_MAX}] for the function to succeed; if not, the
function shall fail. It is unspecified whether the
sched_ss_repl_period and sched_ss_init_budget values are stored as
provided by this function or are rounded to align with the
resolution of the clock being used.
The behavior is undefined if the value specified by the attr
argument to pthread_attr_getschedparam() or
pthread_attr_setschedparam() does not refer to an initialized
thread attributes object.
If successful, the pthread_attr_getschedparam() and
pthread_attr_setschedparam() functions shall return zero;
otherwise, an error number shall be returned to indicate the
error.
The pthread_attr_setschedparam() function shall fail if:
ENOTSUP
An attempt was made to set the attribute to an unsupported
value.
The pthread_attr_setschedparam() function may fail if:
EINVAL The value of param 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.
If an implementation detects that the value specified by the attr
argument to pthread_attr_getschedparam() or
pthread_attr_setschedparam() 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_getschedpolicy(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_...HEDPARAM(3P)
Pages that refer to this page: pthread.h(0p), pthread_attr_getinheritsched(3p), pthread_attr_getschedpolicy(3p), pthread_attr_getscope(3p), pthread_attr_setschedparam(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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