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 .