# pthread_barrierattr_getpshared

## PROLOG



           This manual page is part of the POSIX Programmer's Manual.  The
           Linux implementation of this interface may differ (consult the
           corresponding Linux manual page for details of Linux behavior), or
           the interface may not be implemented on Linux.
    


## NAME



           pthread_barrierattr_getpshared, pthread_barrierattr_setpshared —
           get and set the process-shared attribute of the barrier attributes
           object
    


## SYNOPSIS



           #include <pthread.h>
    
           int pthread_barrierattr_getpshared(const pthread_barrierattr_t
               *restrict _attr_ , int *restrict _pshared_);
           int pthread_barrierattr_setpshared(pthread_barrierattr_t *_attr_ ,
               int _pshared_);
    


## DESCRIPTION



           The _pthread_barrierattr_getpshared_() function shall obtain the
           value of the _process-shared_ attribute from the attributes object
           referenced by _attr_.  The _pthread_barrierattr_setpshared_() function
           shall set the _process-shared_ attribute in an initialized
           attributes object referenced by _attr_.
    
           The _process-shared_ attribute is set to PTHREAD_PROCESS_SHARED to
           permit a barrier to be operated upon by any thread that has access
           to the memory where the barrier is allocated. See _Section 2.9.9_ ,
           _Synchronization Object Copies and Alternative Mappings_ for further
           requirements. The default value of the attribute shall be
           PTHREAD_PROCESS_PRIVATE. Both constants PTHREAD_PROCESS_SHARED and
           PTHREAD_PROCESS_PRIVATE are defined in _< pthread.h>_.
    
           Additional attributes, their default values, and the names of the
           associated functions to get and set those attribute values are
           implementation-defined.
    
           The behavior is undefined if the value specified by the _attr_
           argument to _pthread_barrierattr_getpshared_() or
           _pthread_barrierattr_setpshared_() does not refer to an initialized
           barrier attributes object.
    


## RETURN VALUE



           If successful, the _pthread_barrierattr_getpshared_() function shall
           return zero and store the value of the _process-shared_ attribute of
           _attr_ into the object referenced by the _pshared_ parameter.
           Otherwise, an error number shall be returned to indicate the
           error.
    
           If successful, the _pthread_barrierattr_setpshared_() function shall
           return zero; otherwise, an error number shall be returned to
           indicate the error.
    


## ERRORS



           The _pthread_barrierattr_setpshared_() function may fail if:
    
           **EINVAL** The new value specified for the _process-shared_ attribute is
                  not one of the legal values PTHREAD_PROCESS_SHARED or
                  PTHREAD_PROCESS_PRIVATE.
    
           These functions shall not return an error code of **[EINTR]**.
    
           _The following sections are informative._
    


## EXAMPLES



           None.
    


## APPLICATION USAGE



           The _pthread_barrierattr_getpshared_() and
           _pthread_barrierattr_setpshared_() functions are part of the Thread
           Process-Shared Synchronization option and need not be provided on
           all implementations.
    


## RATIONALE



           If an implementation detects that the value specified by the _attr_
           argument to _pthread_barrierattr_getpshared_() or
           _pthread_barrierattr_setpshared_() does not refer to an initialized
           barrier attributes object, it is recommended that the function
           should fail and report an **[EINVAL]** error.
    


## FUTURE DIRECTIONS



           None.
    


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