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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_condattr_getpshared, pthread_condattr_setpshared — get
and set the process-shared condition variable attributes
#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);
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.
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.
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.
None.
None.
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.
None.
pthread_create(3p), pthread_cond_destroy(3p),
pthread_condattr_destroy(3p), pthread_mutex_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_condattr_destroy(3p), pthread_condattr_getclock(3p), pthread_condattr_setpshared(3p)
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HTML rendering created 2024-06-26 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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