pthread_attr_getscope(3)				     Library Functions Manual					  pthread_attr_getscope(3)

NAME

       pthread_attr_getscope - Obtains the contention scope attribute of the specified thread attributes object.

LIBRARY

       DECthreads POSIX 1003.1c Library (libpthread.so)

SYNOPSIS

       #include <pthread.h>

       int pthread_attr_getscope(
			const pthread_attr_t  *attr,
			int		      *scope);

STANDARDS

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

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

PARAMETERS

       Address of the thread attributes object whose contention scope attribute is obtained.  Receives the value of the contention scope attribute
       of the thread attributes object specified by attr.

DESCRIPTION

       This routine obtains the value of the contention scope attribute of the thread attributes object specified in the attr argument and  stores
       it  in  the location specified by the scope argument.  The specified attributes object must already be initialized at the time this routine
       is called.

       The contention scope attribute specifies the set of threads with which a thread must compete  for  processing  resources.   The	contention
       scope  attribute  specifies  whether  the  new  thread competes for processing resources only with other threads in its own process, called
       process contention scope, or with all threads on the system, called system contention scope.

       DECthreads selects at most one thread to execute on each processor at any point in time.  DECthreads resolves the contention based on  each
       thread's scheduling attributes (for example, priority) and scheduling policy (for example, round-robin).

       A  thread created using a thread attributes object whose contention scope attribute is set to PTHREAD_SCOPE_PROCESS contends for processing
       resources with other threads within its own process that also were created with PTHREAD_SCOPE_PROCESS.  It is unspecified how such  threads
       are  scheduled relative to threads in other processes or threads in the same process that were created with PTHREAD_SCOPE_SYSTEM contention
       scope.

       A thread created using a thread attributes object whose contention scope attribute is set to PTHREAD_SCOPE_SYSTEM contends  for	processing
       resources with other threads in any process that also were created with PTHREAD_SCOPE_SYSTEM.

NOTES

       The value of the contention scope attribute of a particular thread attributes object does not necessarily correspond to the actual schedul-
       ing contention scope of any existing thread in your multithreaded program.

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 attr is not a valid thread attributes object.  This routine is not supported by the imple-
       mentation.

ERRORS

       None

RELATED INFORMATION

       Functions: pthread_attr_init(3), pthread_attr_setscope(3)

       Manuals: Guide to DECthreads and Programmer's Guide

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															  pthread_attr_getscope(3)