mirror of https://github.com/mkerrisk/man-pages
100 lines
3.5 KiB
Plaintext
100 lines
3.5 KiB
Plaintext
.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
|
|
.TH "PTHREAD_CONDATTR_GETPSHARED" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
|
|
.\" pthread_condattr_getpshared
|
|
.SH NAME
|
|
pthread_condattr_getpshared, pthread_condattr_setpshared \- get and
|
|
set the process\-shared condition variable
|
|
attributes
|
|
.SH SYNOPSIS
|
|
.LP
|
|
\fB#include <pthread.h>
|
|
.br
|
|
.sp
|
|
int pthread_condattr_getpshared(const pthread_condattr_t *restrict\fP
|
|
\fIattr\fP\fB,
|
|
.br
|
|
\ \ \ \ \ \ int *restrict\fP \fIpshared\fP\fB);
|
|
.br
|
|
int pthread_condattr_setpshared(pthread_condattr_t *\fP\fIattr\fP\fB,
|
|
.br
|
|
\ \ \ \ \ \ int\fP \fIpshared\fP\fB); \fP
|
|
\fB
|
|
.br
|
|
\fP
|
|
.SH DESCRIPTION
|
|
.LP
|
|
The \fIpthread_condattr_getpshared\fP() function shall obtain the
|
|
value of the \fIprocess-shared\fP attribute from the
|
|
attributes object referenced by \fIattr\fP. The \fIpthread_condattr_setpshared\fP()
|
|
function shall set the \fIprocess-shared\fP
|
|
attribute in an initialized attributes object referenced by \fIattr\fP.
|
|
.LP
|
|
The \fIprocess-shared\fP 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 \fIprocess-shared\fP
|
|
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.
|
|
.SH RETURN VALUE
|
|
.LP
|
|
If successful, the \fIpthread_condattr_setpshared\fP() function shall
|
|
return zero; otherwise, an error number shall be returned
|
|
to indicate the error.
|
|
.LP
|
|
If successful, the \fIpthread_condattr_getpshared\fP() function shall
|
|
return zero and store the value of the
|
|
\fIprocess-shared\fP attribute of \fIattr\fP into the object referenced
|
|
by the \fIpshared\fP parameter. Otherwise, an error
|
|
number shall be returned to indicate the error.
|
|
.SH ERRORS
|
|
.LP
|
|
The \fIpthread_condattr_getpshared\fP() and \fIpthread_condattr_setpshared\fP()
|
|
functions may fail if:
|
|
.TP 7
|
|
.B EINVAL
|
|
The value specified by \fIattr\fP is invalid.
|
|
.sp
|
|
.LP
|
|
The \fIpthread_condattr_setpshared\fP() function may fail if:
|
|
.TP 7
|
|
.B EINVAL
|
|
The new value specified for the attribute is outside the range of
|
|
legal values for that attribute.
|
|
.sp
|
|
.LP
|
|
These functions shall not return an error code of [EINTR].
|
|
.LP
|
|
\fIThe following sections are informative.\fP
|
|
.SH EXAMPLES
|
|
.LP
|
|
None.
|
|
.SH APPLICATION USAGE
|
|
.LP
|
|
None.
|
|
.SH RATIONALE
|
|
.LP
|
|
None.
|
|
.SH FUTURE DIRECTIONS
|
|
.LP
|
|
None.
|
|
.SH SEE ALSO
|
|
.LP
|
|
\fIpthread_create\fP() , \fIpthread_cond_destroy\fP() , \fIpthread_condattr_destroy\fP()
|
|
, \fIpthread_mutex_destroy\fP() , the Base Definitions volume of IEEE\ Std\ 1003.1-2001,
|
|
\fI<pthread.h>\fP
|
|
.SH 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 .
|