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    Command:

    pthread_attr_getscope

    
    
    
    

    SYNOPSIS

           #include <pthread.h>
    
           int pthread_attr_setscope(pthread_attr_t *attr, int scope);
           int pthread_attr_getscope(pthread_attr_t *attr, int *scope);
    
           Compile and link with -pthread.
    
    
    

    DESCRIPTION

           The  pthread_attr_setscope()  function  sets   the   contention   scope
           attribute  of  the  thread attributes object referred to by attr to the
           value specified in scope.  The contention scope attribute  defines  the
           set  of  threads  against which a thread competes for resources such as
           the CPU.  POSIX.1-2001 specifies two possible values for scope:
    
           PTHREAD_SCOPE_SYSTEM
                  The thread competes for resources with all other threads in  all
                  processes  on the system that are in the same scheduling alloca-
                  tion   domain   (a   group   of   one   or   more   processors).
                  PTHREAD_SCOPE_SYSTEM  threads  are  scheduled  relative  to  one
                  another according to their scheduling policy and priority.
    
           PTHREAD_SCOPE_PROCESS
                  The thread competes for resources with all other threads in  the
                  same  process that were also created with the PTHREAD_SCOPE_PRO-
                  CESS contention scope.  PTHREAD_SCOPE_PROCESS threads are sched-
                  uled relative to other threads in the process according to their
                  scheduling policy and priority.  POSIX.1-2001 leaves it unspeci-
                  fied  how these threads contend with other threads in other pro-
                  cess on the system or with other threads  in  the  same  process
                  that  were  created  with  the  PTHREAD_SCOPE_SYSTEM  contention
                  scope.
    
           POSIX.1-2001 requires that an implementation support at  least  one  of
           these  contention scopes.  Linux supports PTHREAD_SCOPE_SYSTEM, but not
           PTHREAD_SCOPE_PROCESS.
    
           On systems that support multiple contention scopes, then, in order  for
           the  parameter  setting  made by pthread_attr_setscope() to have effect
           when calling pthread_create(3), the caller must  use  pthread_attr_set-
           inheritsched(3)   to   set   the  inherit-scheduler  attribute  of  the
           attributes object attr to PTHREAD_EXPLICIT_SCHED.
    
           The  pthread_attr_getscope()  function  returns  the  contention  scope
           attribute  of  the  thread attributes object referred to by attr in the
           buffer pointed to by scope.
    
    
    

    RETURN VALUE

           On success, these functions return 0; on error, they return  a  nonzero
           error number.
    
           user-space  thread  is  bound  directly  to  a single kernel-scheduling
           entity.  This is the case on Linux for the obsolete LinuxThreads imple-
           mentation  and  the  modern  NPTL  implementation,  which  are both 1:1
           threading implementations.
    
           POSIX.1-2001 specifies that the default contention scope is implementa-
           tion-defined.
    
    
    

    SEE ALSO

           pthread_attr_init(3), pthread_attr_setaffinity_np(3),
           pthread_attr_setinheritsched(3), pthread_attr_setschedparam(3),
           pthread_attr_setschedpolicy(3), pthread_create(3), pthreads(7)
    
    
    

    Linux 2013-04-19 PTHREAD_ATTR_SETSCOPE(3)

    
    
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