_lwp_setscheduler(2)						System Calls Manual					      _lwp_setscheduler(2)

NAME

       _lwp_setscheduler() - set LWP(Lightweight Process) scheduling policy and parameters

SYNOPSIS

DESCRIPTION

       The  function  allows the scheduling policy and parameters of an individual LWP in any process to be set.  For and the only required member
       of the sched_param structure is the priority sched_priority.

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

	      This request sets the scheduling policy and associated scheduling parameters
		     for the LWP whose LWP ID is specified by target_lwp to the policy and associated parameters  provided  in	policy	and  param
		     respectively.   The  LWPID specified by target_lwp can be in any process.	If the value of target_lwp is zero(0), the target
		     LWP will be the calling LWP.

	      This request sets the scheduling policy and associated scheduling parameters
		     for all LWPs in the target process specified by target_lwp to the policy and associated parameters  provided  in  policy  and
		     param,  respectively.   For  this	request, the PID value should be passed in the target_lwp parameter.  The policy and param
		     arguments are stored in the process so they may be assigned to the child process during a fork operation.

       If the function fails, no scheduling parameters or policies shall be changed for the specified LWP(s).

       Appropriate privileges are required to change the scheduling parameters of another LWP.	The calling LWP must have  appropriate	privileges
       or be a member of a group having access to successfully call

       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 points to an illegal address.

	      The	     cmd parameter is invalid.

	      The value of the
			     policy  parameter is invalid, or the param parameter is NULL, or one or more parameters contained in param is outside
			     the valid range for the specified scheduling policy.

	      The requesting LWP does not have permission to set the scheduling policy
			     and parameter for the specified LWP(s).

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

	      No process can be found corresponding to that specified by
			     target_lwp for the request.

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_getscheduler(2), sched_setscheduler(2), pthread_setschedparam(3t).

															      _lwp_setscheduler(2)