pthread_getschedparam(3) [redhat man page]

PTHREAD_SETSCHEDPARAM(3)				     Library Functions Manual					  PTHREAD_SETSCHEDPARAM(3)

NAME

       pthread_setschedparam, pthread_getschedparam - control thread scheduling parameters

SYNOPSIS

       #include <pthread.h>

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

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

DESCRIPTION

       pthread_setschedparam  sets  the scheduling parameters for the thread target_thread as indicated by policy and param.  policy can be either
       SCHED_OTHER (regular, non-realtime scheduling), SCHED_RR (realtime, round-robin) or SCHED_FIFO (realtime, first-in first-out).  param spec-
       ifies the scheduling priority for the two realtime policies.  See sched_setpolicy(2) for more information on scheduling policies.

       The realtime scheduling policies SCHED_RR and SCHED_FIFO are available only to processes with superuser privileges.

       pthread_getschedparam  retrieves  the  scheduling policy and scheduling parameters for the thread target_thread and store them in the loca-
       tions pointed to by policy and param, respectively.

RETURN VALUE

       pthread_setschedparam and pthread_getschedparam return 0 on success and a non-zero error code on error.

ERRORS

       On error, pthread_setschedparam returns the following error codes:

	      EINVAL policy is not one of SCHED_OTHER, SCHED_RR, SCHED_FIFO

	      EINVAL the priority value specified by param is not valid for the specified policy

	      EPERM  the calling process does not have superuser permissions

	      ESRCH  the target_thread is invalid or has already terminated

	      EFAULT param points outside the process memory space

       On error, pthread_getschedparam returns the following error codes:

	      ESRCH  the target_thread is invalid or has already terminated

	      EFAULT policy or param point outside the process memory space

AUTHOR

       Xavier Leroy <Xavier.Leroy@inria.fr>

SEE ALSO

       sched_setscheduler(2), sched_getscheduler(2), sched_getparam(2), pthread_attr_setschedpolicy(3), pthread_attr_setschedparam(3).

								   LinuxThreads 					  PTHREAD_SETSCHEDPARAM(3)

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)