"PTHREAD_RWLOCKATTR_GETPSHARED"(P) manual page

From 41f88a82b33cdb357c83b582381232733ed2d039 Mon Sep 17 00:00:00 2001 From: rpj Date: Thu, 5 May 2005 14:18:27 +0000 Subject: '' --- manual/pthread_rwlockattr_setpshared.html | 158 ++++++++++++++++++++++++++++++ 1 file changed, 158 insertions(+) create mode 100644 manual/pthread_rwlockattr_setpshared.html (limited to 'manual/pthread_rwlockattr_setpshared.html') diff --git a/manual/pthread_rwlockattr_setpshared.html b/manual/pthread_rwlockattr_setpshared.html new file mode 100644 index 0000000..eeb7e78 --- /dev/null +++ b/manual/pthread_rwlockattr_setpshared.html @@ -0,0 +1,158 @@ + + + + + "PTHREAD_RWLOCKATTR_GETPSHARED"(P) manual page + + + + + + + +

Table of Contents

Name

pthread_rwlockattr_getpshared, pthread_rwlockattr_setpshared - get +and set the process-shared attribute of the read-write lock +attributes object +

Synopsis

#include <pthread.h> +

int pthread_rwlockattr_getpshared(const pthread_rwlockattr_t * +restrict attr, int *restrict pshared); +
int pthread_rwlockattr_setpshared(pthread_rwlockattr_t *attr, +int pshared); +

Description

The pthread_rwlockattr_getpshared function shall obtain the +value of the process-shared attribute from the initialized +attributes object referenced by attr. The +pthread_rwlockattr_setpshared function shall set the +process-shared attribute in an initialized attributes object +referenced by attr. +

The process-shared attribute shall be set to +PTHREAD_PROCESS_SHARED to permit a read-write lock to be +operated upon by any thread that has access to the memory where the +read-write lock is allocated, even if the read-write lock is +allocated in memory that is shared by multiple processes. If the +process-shared attribute is PTHREAD_PROCESS_PRIVATE, +the read-write lock shall only be operated upon by threads created +within the same process as the thread that initialized the read-write +lock; if threads of differing processes attempt to operate on such a +read-write lock, the behavior is undefined. The default value of the +process-shared attribute shall be PTHREAD_PROCESS_PRIVATE. +

Pthreads-w32 defines _POSIX_THREAD_PROCESS_SHARED in +pthread.h as -1 to indicate that these routines are implemented but +they do not support the process shared option.

Additional attributes, their default values, and the names of the +associated functions to get and set those attribute values are +implementation-defined. +

Pthreads-w32 defines _POSIX_READER_WRITER_LOCKS in +pthread.h as 200112L to indicate that the reader/writer routines are +implemented and may be used.

Return Value

Upon successful completion, the pthread_rwlockattr_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. +

If successful, the pthread_rwlockattr_setpshared function +shall return zero; otherwise, an error number shall be returned to +indicate the error. +

Errors

The pthread_rwlockattr_getpshared and +pthread_rwlockattr_setpshared functions may fail if: +

EINVAL +: + The value specified by attr is invalid. +

+The pthread_rwlockattr_setpshared function may fail if: +

EINVAL +: + The new value specified for the attribute is outside the range of + legal values for that attribute. +
+ ENOTSUP +: + The new value specified for the attribute is PTHREAD_PROCESS_SHARED. +

+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. +

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 +. +

Modified by Ross Johnson for use with Pthreads-w32.

Table of Contents

Name +
+
Synopsis +
+
Description +
+
Return + Value +
+
Errors +
+
Examples +
+
Application + Usage +
+
Rationale +
+
Future + Directions +
+
See + Also +
+
Copyright +
+

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