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_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. See Section 2.9.9,
       Synchronization Object Copies and Alternative Mappings for further requirements. The default value of the
       attribute is PTHREAD_PROCESS_PRIVATE.

       The behavior is undefined if the value specified by the attr argument to pthread_condattr_getpshared() or
       pthread_condattr_setpshared() does not refer to an initialized condition variable attributes object.

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_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

       If    an    implementation    detects    that   the   value   specified   by   the   attr   argument   to
       pthread_condattr_getpshared() or pthread_condattr_setpshared() does not refer to an initialized condition
       variable attributes object, it is recommended that the function should fail and report an [EINVAL] error.

FUTURE DIRECTIONS

       None.

SEE ALSO

       pthread_create(), pthread_cond_destroy(), pthread_condattr_destroy(), pthread_mutex_destroy()

       The Base Definitions volume of POSIX.1‐2017, <pthread.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard
       for Information  Technology  --  Portable  Operating  System  Interface  (POSIX),  The  Open  Group  Base
       Specifications  Issue  7, 2018 Edition, Copyright (C) 2018 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 .

       Any  typographical  or formatting errors that appear in this page are most likely to have been introduced
       during  the  conversion  of  the  source  files  to  man  page  format.  To  report  such   errors,   see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                                   2017                   PTHREAD_CONDATTR_GETPSHARED(3POSIX)