pthread_attr_getschedparam(3) [v7 man page]

PTHREAD_ATTR_SETSCHEDPARAM(3)				     Linux Programmer's Manual				     PTHREAD_ATTR_SETSCHEDPARAM(3)

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 schedul-
       ing 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

       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).

ATTRIBUTES

       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()  | 	      | 	|
       +------------------------------+---------------+---------+
CONFORMING TO

       POSIX.1-2001, POSIX.1-2008.

NOTES

       See pthread_attr_setschedpolicy(3) for a list of the thread scheduling policies supported on Linux.

EXAMPLE

       See pthread_setschedparam(3).

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 4.15 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 https://www.kernel.org/doc/man-pages/.

Linux								    2017-09-15					     PTHREAD_ATTR_SETSCHEDPARAM(3)

PTHREAD_ATTR_SETSCHEDPARAM(3)				     Linux Programmer's Manual				     PTHREAD_ATTR_SETSCHEDPARAM(3)

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 schedul-
       ing 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

       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).

ATTRIBUTES

       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()  | 	      | 	|
       +------------------------------+---------------+---------+
CONFORMING TO

       POSIX.1-2001, POSIX.1-2008.

NOTES

       See pthread_attr_setschedpolicy(3) for a list of the thread scheduling policies supported on Linux.

EXAMPLE

       See pthread_setschedparam(3).

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 4.15 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 https://www.kernel.org/doc/man-pages/.

Linux								    2017-09-15					     PTHREAD_ATTR_SETSCHEDPARAM(3)