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NetBSD 6.1.5 - man page for pthread_attr_setscope (netbsd section 3)

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 pos-
     sible 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
			      scheduling.

     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


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