PTHREAD_ATTR_GETSCOPE(3)				   BSD Library Functions Manual 				  PTHREAD_ATTR_GETSCOPE(3)

NAME

     pthread_attr_getscope -- get and set the contention scope attribute

LIBRARY

     POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS

     #include <pthread.h>

     int
     pthread_attr_getscope(const pthread_attr_t * restrict attr, int * restrict contentionscope);

     int
     pthread_attr_setscope(pthread_attr_t *attr, int contentionscope);

DESCRIPTION

     The pthread_attr_getscope() and pthread_attr_setscope() functions get and set, respectively, the contention scope attribute in the attr
     object.

     The contentionscope parameter specifies the scheduling contention scope of a thread.  It is only possible to set the scope of a thread before
     the thread is created.  There are two possible contention scopes:

       PTHREAD_SCOPE_SYSTEM   The thread will contend for CPU resources with all other processes and threads in the system.  Generally this means
			      that the user thread is bound directly to the kernel scheduling for its entire lifetime.

       PTHREAD_SCOPE_PROCESS  The thread will contend with other threads with the same scope attribute.  In general, this means that all
			      PTHREAD_SCOPE_PROCESS threads are grouped together and this group of threads contends for CPU resources.	This is
			      commonly seen to require a hybrid (``M:N'') threading model in order to multiplex the user and kernel space schedul-
			      ing.

     Only PTHREAD_SCOPE_SYSTEM is supported in NetBSD.

RETURN VALUES

     Upon successful completion, both functions return 0.  Otherwise an error number is returned to indicate the error.

ERRORS

     No errors are defined for pthread_attr_getscope().

     The pthread_attr_setscope() function shall fail if:

     [EINVAL]		Invalid parameter.

SEE ALSO

     pthread_attr(3), csf(9)

STANDARDS

     Both functions conform to ISO/IEC 9945-1:1996 (``POSIX.1'').

BSD
								   July 7, 2010 							       BSD