PTHREAD_CONDATTR_GETPSHARED(3P)                     POSIX Programmer's Manual                    PTHREAD_CONDATTR_GETPSHARED(3P)



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

NAME
       pthread_condattr_getpshared, pthread_condattr_setpshared - get and set the process-shared condition variable attributes

SYNOPSIS
       #include <pthread.h>

       int pthread_condattr_getpshared(const pthread_condattr_t *restrict attr,
              int *restrict pshared);
       int pthread_condattr_setpshared(pthread_condattr_t *attr,
              int pshared);


DESCRIPTION
       The  pthread_condattr_getpshared()  function  shall  obtain the value of the process-shared attribute from the attributes
       object referenced by attr. The pthread_condattr_setpshared() function shall set the process-shared attribute in  an  ini-
       tialized attributes object referenced by attr.

       The  process-shared  attribute is set to PTHREAD_PROCESS_SHARED to permit a condition variable to be operated upon by any
       thread that has access to the memory where the condition variable is allocated, even if the condition variable  is  allo-
       cated  in  memory  that  is shared by multiple processes. If the process-shared attribute is PTHREAD_PROCESS_PRIVATE, the
       condition variable shall only be operated upon by threads created within the same process as the thread that  initialized
       the  condition  variable; if threads of differing processes attempt to operate on such a condition variable, the behavior
       is undefined. The default value of the attribute is PTHREAD_PROCESS_PRIVATE.

RETURN VALUE
       If successful, the pthread_condattr_setpshared() function shall return zero; otherwise, an error number shall be returned
       to indicate the error.

       If  successful,  the  pthread_condattr_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.

ERRORS
       The pthread_condattr_getpshared() and pthread_condattr_setpshared() functions may fail if:

       EINVAL The value specified by attr is invalid.


       The pthread_condattr_setpshared() function may fail if:

       EINVAL The new value specified for the attribute is outside the range of legal values for that attribute.


       These functions shall not return an error code of [EINTR].

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       pthread_create(),  pthread_cond_destroy(), pthread_condattr_destroy(), pthread_mutex_destroy(), the Base Definitions vol-
       ume of IEEE Std 1003.1-2001, <pthread.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003  Edition,  Standard  for
       Information  Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copy-
       right (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any
       discrepancy  between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group
       Standard  is  the  referee   document.   The   original   Standard   can   be   obtained   online   at   http://www.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                               PTHREAD_CONDATTR_GETPSHARED(3P)