PTHREAD_ATTR_SETSCHEDPARAM
PTHREAD_ATTR_SETSCHEDPARAM
NAMESYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
ATTRIBUTES
CONFORMING TO
NOTES
EXAMPLE
SEE ALSO
COLOPHON
NAME
pthread_attr_setschedparam, pthread_attr_getschedparam − set/get scheduling parameter attributes in thread attributes object
SYNOPSIS
#include <pthread.h>
int
pthread_attr_setschedparam(pthread_attr_t
*attr,
const struct sched_param *param);
int pthread_attr_getschedparam(const pthread_attr_t
*attr,
struct sched_param *param);
Compile and link with −pthread.
DESCRIPTION
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.
RETURN VALUE
On success, these functions return 0; on error, they return a nonzero error number.
ERRORS
POSIX.1 documents EINVAL and ENOTSUP errors for pthread_attr_setschedparam(). On Linux these functions always succeed (but portable and future-proof applications should nevertheless handle a possible error return).
ATTRIBUTES
Multithreading
(see pthreads(7))
The pthread_attr_setschedparam() and
pthread_attr_getschedparam() functions are
thread-safe.
CONFORMING TO
POSIX.1-2001.
NOTES
See pthread_attr_setschedpolicy(3) for a list of the thread scheduling policies supported on Linux.
EXAMPLE
SEE ALSO
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)
COLOPHON
This page is part of release 3.69 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man−pages/.
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