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PTHREAD_CONDATTR_GETPSHARED(3P) Programmer's ManualD_CONDATTR_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_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. If the process-shared attribute is
PTHREAD_PROCESS_PRIVATE, the condition variable shall only be
operated upon by threads created within the same process as the
thread that initialized the condition variable; if threads of
differing processes attempt to operate on such a condition variable,
the behavior is undefined. 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.1‐2008, 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_CONDATTR_GETPSHARED(3P)
Pages that refer to this page: pthread.h(0p), pthread_condattr_destroy(3p), pthread_condattr_getclock(3p), pthread_condattr_setpshared(3p)