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 initialized 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 allocated 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 volume 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, Copyright (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.opengroup.org/unix/online.html .