pthread_getschedparam(3) [osf1 man page]

pthread_getschedparam(3)				     Library Functions Manual					  pthread_getschedparam(3)

NAME

       pthread_getschedparam - Obtains the current scheduling policy and scheduling parameters of a thread.

LIBRARY

       DECthreads POSIX 1003.1c Library (libpthread.so)

SYNOPSIS

       #include <pthread.h>

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

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       IEEE Std 1003.1c-1995, POSIX System Application Program Interface

PARAMETERS

       Thread  whose  scheduling  policy  and  parameters  are	obtained.  Receives the value of the scheduling policy for the thread specified in
       thread.	Refer to the description of the pthread_setschedparam(3) routine for valid parameters and their meanings.  Receives the  value	of
       the  scheduling	parameters for the thread specified in thread.	Refer to the description of the pthread_setschedparam(3) routine for valid
       values.

DESCRIPTION

       This routine obtains both the current scheduling policy and associated scheduling parameters of the thread specified by	the  thread  argu-
       ment.

       The  priority  value returned in the param structure is the value specified in the attr argument passed to pthread_create(3) or by the most
       recent call to pthread_setschedparam(3) that affects the target thread.

       This routine differs from pthread_attr_getschedpolicy(3) and pthread_attr_getschedparam(3), in that those routines get the scheduling  pol-
       icy  and  parameter attributes that are used to establish the priority and scheduling policy of a new thread when it is created.  This rou-
       tine, however, obtains the scheduling policy and parameters of an existing thread.

RETURN VALUES

       If an error condition occurs, this routine returns an integer value indicating the type of error.  Possible return values are  as  follows:
       Successful completion.  The value specified by thread does not refer to an existing thread.

ERRORS

       None

RELATED INFORMATION

       Functions: pthread_attr_getschedparam(3), pthread_attr_getschedpolicy(3), pthread_create(3), pthread_self(3), pthread_setschedparam(3)

       Manuals: Guide to DECthreads and Programmer's Guide

       delim off

															  pthread_getschedparam(3)

pthread_getschedparam(3C)												 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);

       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_FIFO,  SCHED_RR,  and  SCHED_OTHER.  See
       pthreads(5).  For SCHED_FIFO, SCHED_RR, and SCHED_OTHER, 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  reflects  any  temporary
       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.

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

       The pthread_getschedparam() function may fail if:

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

       The pthread_setschedparam() function may 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
		       specified thread.

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

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

       pthread_attr_init(3C),	sched_getparam(3RT),   sched_setparam(3RT),   sched_getscheduler(3RT),	 sched_setscheduler(3RT),   attributes(5),
       pthreads(5), standards(5)

								    23 Nov 2005 					 pthread_getschedparam(3C)