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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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PTHREAD...TPSHARED(3P) POSIX Programmer's Manual PTHREAD...TPSHARED(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. See Section 2.9.9,
Synchronization Object Copies and Alternative Mappings for further
requirements. 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.1‐2017, pthread.h(0p)
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...TPSHARED(3P)
Pages that refer to this page: pthread.h(0p), pthread_rwlockattr_destroy(3p), pthread_rwlockattr_setpshared(3p)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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