PROLOG         top

       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         top

       pthread_rwlockattr_getpshared, pthread_rwlockattr_setpshared — get
       and set the process-shared attribute of the read-write lock
       attributes object

SYNOPSIS         top

       #include <pthread.h>

       int pthread_rwlockattr_getpshared(const pthread_rwlockattr_t
           *restrict attr, int *restrict pshared);
       int pthread_rwlockattr_setpshared(pthread_rwlockattr_t *attr,
           int pshared);

DESCRIPTION         top

       The pthread_rwlockattr_getpshared() function shall obtain the value
       of the process-shared attribute from the initialized attributes
       object referenced by attr.  The pthread_rwlockattr_setpshared()
       function shall set the process-shared attribute in an initialized
       attributes object referenced by attr.

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

       Additional attributes, their default values, and the names of the
       associated functions to get and set those attribute values are

       The behavior is undefined if the value specified by the attr argument
       to pthread_rwlockattr_getpshared() or pthread_rwlockattr_setpshared()
       does not refer to an initialized read-write lock attributes object.

RETURN VALUE         top

       Upon successful completion, the pthread_rwlockattr_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_rwlockattr_setpshared() function shall
       return zero; otherwise, an error number shall be returned to indicate
       the error.

ERRORS         top

       The pthread_rwlockattr_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         top




RATIONALE         top




SEE ALSO         top

       pthread_rwlock_destroy(3p), pthread_rwlockattr_destroy(3p)

       The Base Definitions volume of POSIX.1‐2008, pthread.h(0p)

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The Open
       Group Base Specifications Issue 7, Copyright (C) 2013 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
       applied.) 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 .

       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 .

IEEE/The Open Group                 2013   PTHREAD_RWLOCKATTR_GETPSHARED(3P)