_lwp_getscheduler(2) [hpux man page]

_lwp_getscheduler(2)						System Calls Manual					      _lwp_getscheduler(2)

NAME

       _lwp_getscheduler() - get LWP(Lightweight Process) scheduling policy and parameters

SYNOPSIS

DESCRIPTION

       The function allows the scheduling policy and parameters of an individual LWP within any process to be retrieved.

       The  cmd  argument  determines  the action to be performed by the system call.  The following command is available. Other values of cmd are
       reserved for use by HP and may change without notice.  The behavior of _lwp_getscheduler is undefined if any other value is passed  to  the
       cmd argument and it may change without notice.

	      This request retrieves the scheduling policy and associated scheduling
		     parameters  for  the  LWP	whose LWP ID is specified by target_lwp and store those in policy and param, respectively.  If the
		     value of target_lwp is zero(0), the target LWP will be the calling LWP.

       The priority value returned shall be the value specified by the most recent call affecting the target LWP(s) and will not reflect any  tem-
       porary adjustments to its priority as a result of any priority inheritance or ceiling functions.

       Refer  to  the  rtsched(2)  manpage for a complete description of scheduling policies and priorities available.	is similar to the function
       except that it operates on lightweight processes instead of processes.

RETURN VALUE

       Upon successful completion, returns with a value of 0; otherwise, it returns an error number to indicate the error.  The  variable  is  NOT
       set if an error occurs.

ERRORS

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

	      The target process could not be accessed due to compartmental restrictions.

	      The	     param parameter or the policy parameter points to an illegal address.

	      The	     cmd parameter is invalid.

	      No LWP can be found corresponding to that specified by
			     target_lwp.

WARNINGS

       In  general,  the  POSIX pthread interfaces should be used by multi-threaded applications.  This system call may be used directly only when
       the application has a need to operate on LWPs in another process.  This system call may result in undefined behavior if the usage is  mixed
       with POSIX pthread APIs.

SEE ALSO

       _lwp_setscheduler(2), sched_getscheduler(2), pthread_getschedparam(3t).

															      _lwp_getscheduler(2)

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)