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PTHREAD_ATTR(3)          BSD Library Functions Manual          PTHREAD_ATTR(3)

NAME
     pthread_attr_getscope, pthread_attr_setscope -- thread attribute operations

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
     Thread attributes are used to specify parameters to pthread_create().  One attribute object can be used
     in multiple calls to pthread_create(), with or without modifications between calls.

     The pthread_attr_setscope() and pthread_attr_getscope() functions, respectively, set and get the
     attribute within attr argument that controls the contention scope of the thread.  The acceptable values
     are PTHREAD_SCOPE_SYSTEM, indicating a scheduling contention scope that is system-wide, and
     PTHREAD_SCOPE_PROCESS, which indicates a process scheduling contention scope.  Currently on Mac OS X we
     only support PTHREAD_SCOPE_SYSTEM.

RETURN VALUES
     If successful, these functions return 0.  Otherwise, an error number is returned to indicate the error.

ERRORS
     pthread_attr_getscope() will fail if:

     [EINVAL]           Invalid value for attr.

     pthread_attr_setscope() will fail if:

     [EINVAL]           Invalid value for attr.

     [ENOTSUP]          Invalid or unsupported value for contentionscope.

SEE ALSO
     pthread_create(3), pthread_attr_init(3), pthread_attr_setinheritsched(3),
     pthread_attr_setschedpolicy(3), pthread_attr_setschedparam(3)

STANDARDS
     pthread_attr_setscope(), pthread_attr_getscope() conform to Version 2 of the Single UNIX Specification
     (``SUSv2'')

BSD                            December 31, 2007                           BSD