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PTHREAD_ATTR_GETSCHEDPARAM(3P)X Programmer's ManualAD_ATTR_GETSCHEDPARAM(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.1‐2008, pthread.h(0p),
sched.h(0p)
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 http://www.unix.org/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 2013 PTHREAD_ATTR_GETSCHEDPARAM(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)