"PTHREAD_BARRIERATTR_GETPSHARED"(P) manual page

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POSIX Threads for Windows – REFERENCE - Pthreads-w32

Reference Index

Table of Contents

Name

pthread_barrierattr_getpshared, pthread_barrierattr_setpshared - +get and set the process-shared attribute of the barrier attributes +object (ADVANCED REALTIME THREADS) +

Synopsis

#include <pthread.h> +

int pthread_barrierattr_getpshared(const pthread_barrierattr_t +* restrict attr, int *restrict pshared); +
int pthread_barrierattr_setpshared(pthread_barrierattr_t *attr, +int pshared); +

Description

The pthread_barrierattr_getpshared function shall obtain +the value of the process-shared attribute from the attributes +object referenced by attr. The pthread_barrierattr_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 barrier to be operated upon by any +thread that has access to the memory where the barrier is allocated. +If the process-shared attribute is PTHREAD_PROCESS_PRIVATE, +the barrier shall only be operated upon by threads created within the +same process as the thread that initialized the barrier; if threads +of different processes attempt to operate on such a barrier, the +behavior is undefined. The default value of the attribute shall be +PTHREAD_PROCESS_PRIVATE. Both constants PTHREAD_PROCESS_SHARED and +PTHREAD_PROCESS_PRIVATE are defined in <pthread.h>. +

Pthreads-w32 defines _POSIX_THREAD_PROCESS_SHARED in +pthread.h as -1 to indicate that these routines are implemented but +that the process shared attribute is not supported.

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

Return Value

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

Errors

These functions may fail if: +

EINVAL +: + The value specified by attr is invalid. +
+ The pthread_barrierattr_setpshared function may fail if: +
+ EINVAL +: + The new value specified for the process-shared attribute is + not one of the legal values PTHREAD_PROCESS_SHARED or + PTHREAD_PROCESS_PRIVATE. +
+ ENOSYS +: + The value specified by attr was PTHREAD_PROCESS_SHARED + (Pthreads-w32).

+These functions shall not return an error code of [EINTR]. +

The following sections are informative. +

Examples

None. +

Application Usage

The pthread_barrierattr_getpshared and +pthread_barrierattr_setpshared functions are part of the +Barriers option and need not be provided on all implementations. +

Pthreads-w32 defines _POSIX_BARRIERS and +_POSIX_THREAD_PROCESS_SHARED in pthread.h as -1 to indicate +that these routines are implemented and may be used, but do not +support the process shared option.

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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