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PTHREAD_CONDATTR_GETPSHARED
Section: POSIX Programmer's Manual (3P)
Updated: 2003
Index
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PROLOG
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.
NAME
pthread_condattr_getpshared, pthread_condattr_setpshared - get and
set the process-shared condition variable
attributes
SYNOPSIS
#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);
DESCRIPTION
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.
RETURN VALUE
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.
ERRORS
The pthread_condattr_getpshared() and pthread_condattr_setpshared()
functions may fail if:
- EINVAL
-
The value specified by attr is invalid.
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.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
pthread_create(), pthread_cond_destroy(), pthread_condattr_destroy(),
pthread_mutex_destroy(), the Base Definitions volume of IEEE Std 1003.1-2001,
<pthread.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 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 .
Index
- PROLOG
-
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- EXAMPLES
-
- APPLICATION USAGE
-
- RATIONALE
-
- FUTURE DIRECTIONS
-
- SEE ALSO
-
- COPYRIGHT
-
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