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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_mutexattr_getpshared, pthread_mutexattr_setpshared — get
and set the process-shared attribute
#include <pthread.h>
int pthread_mutexattr_getpshared(const pthread_mutexattr_t
*restrict attr, int *restrict pshared);
int pthread_mutexattr_setpshared(pthread_mutexattr_t *attr,
int pshared);
The pthread_mutexattr_getpshared() function shall obtain the value
of the process-shared attribute from the attributes object
referenced by attr.
The pthread_mutexattr_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 mutex to be operated upon by any thread that has access
to the memory where the mutex is allocated, even if the mutex 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 shall be PTHREAD_PROCESS_PRIVATE.
The behavior is undefined if the value specified by the attr
argument to pthread_mutexattr_getpshared() or
pthread_mutexattr_setpshared() does not refer to an initialized
mutex attributes object.
Upon successful completion, pthread_mutexattr_setpshared() shall
return zero; otherwise, an error number shall be returned to
indicate the error.
Upon successful completion, pthread_mutexattr_getpshared() 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.
The pthread_mutexattr_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.
If an implementation detects that the value specified by the attr
argument to pthread_mutexattr_getpshared() or
pthread_mutexattr_setpshared() does not refer to an initialized
mutex attributes object, it is recommended that the function
should fail and report an [EINVAL] error.
None.
pthread_cond_destroy(3p), pthread_create(3p),
pthread_mutex_destroy(3p), pthread_mutexattr_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_mutexattr_setpshared(3p), pthread_mutex_destroy(3p)
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HTML rendering created 2025-02-02 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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