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PTHREAD_RWLOCKATTR_GETPSHARED(3P)rogrammer'sTManualRWLOCKATTR_GETPSHARED(3P)
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.
pthread_rwlockattr_getpshared, pthread_rwlockattr_setpshared — get
and set the process-shared attribute of the read-write lock
attributes object
#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);
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
PTHREAD_PROCESS_PRIVATE.
Additional attributes, their default values, and the names of the
associated functions to get and set those attribute values are
implementation-defined.
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.
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.
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.
None.
None.
None.
None.
pthread_rwlock_destroy(3p), pthread_rwlockattr_destroy(3p)
The Base Definitions volume of POSIX.1‐2008, pthread.h(0p)
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 http://www.unix.org/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 2013 PTHREAD_RWLOCKATTR_GETPSHARED(3P)
Pages that refer to this page: pthread.h(0p), pthread_rwlockattr_destroy(3p), pthread_rwlockattr_setpshared(3p)