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pthread_attr_setinheritsched(3)
NAME
  pthread_attr_setinheritsched - Changes the inherit scheduling attribute of
  the specified thread attributes object.

LIBRARY
  DECthreads POSIX 1003.1c Library (libpthread.so)

SYNOPSIS
  #include <pthread.h>

  int pthread_attr_setinheritsched(
		pthread_attr_t	*attr,
		int		inheritsched);

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

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

PARAMETERS
  attr	    Thread attributes object whose inherit scheduling attribute is to
	    be modified.

  inheritsched
	    New value for the inherit scheduling attribute.  Valid values are
	    as follows:

	    PTHREAD_INHERIT_SCHED
		  The created thread inherits the scheduling policy and
		  associated scheduling attributes of the thread calling
		  pthread_create(3).  Any scheduling attributes in the
		  attributes object specified by the pthread_create(3) attr
		  argument are ignored during thread creation.	This is the
		  default value.

	    PTHREAD_EXPLICIT_SCHED
		  The scheduling policy and associated scheduling attributes
		  of the created thread are set to the corresponding values
		  from the attribute object specified by the
		  pthread_create(3) attr argument.

DESCRIPTION
  This routine changes the inherit scheduling attribute of the thread
  attributes object specified by the attr argument.  The inherit scheduling
  attribute specifies whether a thread created using the specified attributes
  object inherits the scheduling attributes of the creating thread, or uses
  the scheduling attributes stored in the attributes object specified by the
  pthread_create(3) attr argument.

  The first thread in an application has a scheduling policy of SCHED_OTHER.
  See the pthread_attr_setschedparam(3) and pthread_attr_setschedpolicy(3)
  routines for more information on valid priority values and valid scheduling
  policy values, respectively.

  Inheriting scheduling attributes (instead of using the scheduling
  attributes stored in the attributes object) is useful when a thread is
  creating several helper threads--that is, threads that are intended to work
  closely with the creating thread to cooperatively solve the same problem.
  For example, inherited scheduling attributes ensure that helper threads
  created in a sort routine execute with the same priority as the calling
  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:

  0	    Successful completion.

  [EINVAL]  The value specified by the attr argument is not a valid thread
	    attributes object, or the inheritsched argument contains an
	    invalid value.

  [ENOTSUP] An attempt was made to set the attribute to an unsupported value.

ERRORS
  None

RELATED INFORMATION
  Functions: pthread_attr_init(3), pthread_attr_getinheritsched(3),
  pthread_attr_setschedpolicy(3), pthread_attr_setschedparam(3),
  pthread_create(3)

  Manuals: Guide to DECthreads and Programmer's Guide

Index for Section 3

Alphabetical listing for P

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