pthread_setschedparam(3t) [hpux man page]

pthread_getschedparam(3T)												 pthread_getschedparam(3T)

NAME

       pthread_getschedparam(), pthread_setschedparam() - get or set the scheduling policy and associated parameters

SYNOPSIS

PARAMETERS

	      thread	The thread whose scheduling policy and associated parameters are to be set/retrieved.

	      policy	This parameter either points to the memory location where the scheduling policy of thread is returned (get function) or it
			specifies the new value of the scheduling policy for thread (set function).

	      param	This parameter either points to the memory location where the scheduling parameters of thread are returned (get  function)
			or it specifies the new scheduling parameters for thread (set function).

DESCRIPTION

       These  functions  allow	the  scheduling  policy  and  associated  parameters of threads within a multithreaded process to be retrieved and
       changed.  The legal values for the scheduling policy and associated scheduling parameters are defined in

       changes the scheduling policy and associated scheduling parameters for thread to the policy and the associated parameters provided in  pol-
       icy  and  param, respectively.  On HP-UX, appropriate privileges are required to change the scheduling parameters of a thread.  The calling
       process must have appropriate privileges or be a member of a group having access to successfully call

       The function retrieves the scheduling policy and associated parameters for thread and stores those values  in  policy  and  param,  respec-
       tively.	The values returned represent the actual scheduling values, not any temporary values that may be in effect due to priority inheri-
       tance or priority ceiling features.

   Notes
       For the and scheduling policies, only the sched_priority member of the structure is required in the associated scheduling parameters.   All
       other  scheduling  policies  have  implementation-defined  scheduling  policies.  Refer to the documentation for rtsched(2) and for further
       information on implementation-defined scheduling policies.

RETURN VALUE

       Upon successful completion, and return zero.  Otherwise, an error number is returned to indicate the error (the variable is not set).

ERRORS

       If any of the following occur, the and functions return the corresponding error number:

	      is not defined and these functions are not supported.

       For each of the following conditions, if the condition is detected, the function returns the corresponding error number:

	      policy	     or one of the scheduling parameters in param is invalid.

	      Either the policy or scheduling parameters contain an
			     unsupported value.

	      The caller does not have permission to set either the
			     scheduling policy specified in policy or the scheduling parameters specified in param for thread.

	      No thread could be found corresponding to
			     thread.

       For each of the following conditions, if the condition is detected, the function returns the corresponding error number:

	      No thread could be found corresponding to
			     thread.

	      The value specified by
			     policy or param is invalid.

AUTHOR

       and were derived from the IEEE POSIX P1003.1c standard.

SEE ALSO

       pthread_attr_setschedparam(3T),	  pthread_attr_setschedpolicy(3T),    pthread_attr_getschedparam(3T),	  pthread_attr_getschedpolicy(3T),
       rtsched(2).

STANDARDS CONFORMANCE

								  Pthread Library					 pthread_getschedparam(3T)

pthread_getschedparam(3C)				   Standard C Library Functions 				 pthread_getschedparam(3C)

NAME

       pthread_getschedparam, pthread_setschedparam - access dynamic thread scheduling parameters

SYNOPSIS

       cc -mt [ flag... ] file... -lpthread [ library... ]
       #include <pthread.h>

       int pthread_getschedparam(pthread_t thread, int *restrict policy,
	    struct sched_param *restrict param);

       int pthread_setschedparam(pthread_t thread, int policy,
	    const struct sched_param *param);

DESCRIPTION

       The  pthread_getschedparam()  and  pthread_setschedparam()  functions  allow  the scheduling policy and scheduling parameters of individual
       threads within a multithreaded process to be retrieved and set. Supported policies are :

       SCHED_OTHER    traditional time-sharing scheduling class

       SCHED_FIFO     real-time class: run to completion

       SCHED_RR       real-time class: round-robin

       SCHED_IA       interactive time-sharing class

       SCHED_FSS      fair-share scheduling class

       SCHED_FX       fixed priority scheduling class

       See pthreads(5). The affected scheduling parameter is the sched_priority member of the sched_param structure.

       The pthread_getschedparam() function retrieves the scheduling policy and scheduling parameters for the thread whose thread ID is  given	by
       thread  and  stores  those  values in policy and param, respectively. The priority value returned from pthread_getschedparam() is the value
       specified by the most recent pthread_setschedparam() or pthread_create() call affecting the target thread, and does not reflect any  tempo-
       rary  adjustments  to  its priority as a result of any priority inheritance or ceiling functions. The pthread_setschedparam() function sets
       the scheduling policy and associated scheduling parameters for the thread whose thread  ID is given by thread to the policy and	associated
       parameters provided in policy and param, respectively.

       If the pthread_setschedparam() function fails, no scheduling parameters will be changed	for the target thread.

RETURN VALUES

       If successful, the pthread_getschedparam() and pthread_setschedparam() functions return	0. Otherwise, an error number is returned to indi-
       cate the error.

ERRORS

       The pthread_getschedparam() and pthread_gsetschedparam() functions will fail if:

       ESRCH	The value specified by thread does not refer to an existing thread.

       The pthread_setschedparam() function will fail if:

       EINVAL	 The value specified by policy or one of the scheduling parameters associated with the scheduling policy policy is invalid.

       EPERM	 The caller does not have the appropriate permission to set either the scheduling parameters or the scheduling policy of the spec-
		 ified thread.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+
       |Standard		     |See standards(5). 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       pthread_attr_init(3C),  sched_getparam(3C),  sched_get_priority_max(3C)sched_get_priority_max(3C),  sched_get_priority_min(3C),	sched_set-
       param(3C), sched_getscheduler(3C), sched_setscheduler(3C), attributes(5), pthreads(5), standards(5)

SunOS 5.11							    1 Apr 2008						 pthread_getschedparam(3C)