pthread_attr_getscope man page on NetBSD

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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 con‐
			      tends 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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