PTHREAD_ATTR_SETSCHEDPARAM(Linux Programmer's ManPTHREAD_ATTR_SETSCHEDPARAM(3)



NAME
       pthread_attr_setschedparam, pthread_attr_getschedparam - set/get sched-
       uling 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
       pthread_attr_setschedparam() can fail with the following error:

       EINVAL The priority specified in param does not make sense for the cur-
	      rent scheduling policy of attr.

       POSIX.1	also  documents	 an  ENOTSUP  error for pthread_attr_setsched-
       param().	 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 4.10 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				  2015-08-08	 PTHREAD_ATTR_SETSCHEDPARAM(3)