scheduling

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)