"PTHREAD_MUTEXATTR_GETPSHARED"(P) manual page

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POSIX Threads for Windows – REFERENCE - Pthreads-w32

Reference Index

Table of Contents

Name

pthread_mutexattr_getpshared, pthread_mutexattr_setpshared - get +and set the process-shared attribute +

Synopsis

#include <pthread.h> +

int pthread_mutexattr_getpshared(const pthread_mutexattr_t * +restrict attr, int *restrict pshared); +
int pthread_mutexattr_setpshared(pthread_mutexattr_t *attr, +int pshared); +

Description

The pthread_mutexattr_getpshared function shall obtain the +value of the process-shared attribute from the attributes +object referenced by attr. The pthread_mutexattr_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 mutex to be operated upon +by any thread that has access to the memory where the mutex is +allocated, even if the mutex is allocated in memory that is shared by +multiple processes. If the process-shared attribute is +PTHREAD_PROCESS_PRIVATE, the mutex shall only be operated upon +by threads created within the same process as the thread that +initialized the mutex; if threads of differing processes attempt to +operate on such a mutex, the behavior is undefined. The default value +of the 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 +the process shared option is not supported.

Return Value

Upon successful completion, pthread_mutexattr_setpshared +shall return zero; otherwise, an error number shall be returned to +indicate the error. +

Upon successful completion, pthread_mutexattr_getpshared +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_mutexattr_getpshared and +pthread_mutexattr_setpshared functions may fail if: +

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

+The pthread_mutexattr_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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