pthread_condattr_getpshared Subroutine

Base Operating System and Extensions Technical Reference, Volume 1

pthread_condattr_getpshared Subroutine

Purpose

Returns the value of the pshared attribute of a condition attributes object.

Library

Threads Library (libpthreads.a)

Syntax

#include <pthread.h>

int pthread_condattr_getpshared (attr, pshared)
const pthread_condattr_t *attr;
int *pshared;

Description

The pthread_condattr_getpshared subroutine returns the value of the pshared attribute of the condition attribute object attr. This attribute specifies the process sharing of the condition variable created with this attributes object. It may have one of the following values:

PTHREAD_PROCESS_SHARED	Specifies that the condition variable can be used by any thread that has access to the memory where it is allocated, even if these threads belong to different processes.
PTHREAD_PROCESS_PRIVATE	Specifies that the condition variable shall only be used by threads within the same process as the thread that created it. This is the default value.

Note: The pthread.h header file must be the first included file of each source file using the threads library. Otherwise, the -D_THREAD_SAFE compilation flag should be used, or the cc_r compiler used. In this case, the flag is automatically set.

Parameters

attr	Specifies the condition attributes object.
pshared	Points to where the pshared attribute value will be stored.

Return Values

Upon successful completion, the value of the pshared attribute is returned via the pshared parameter, and 0 is returned. Otherwise, an error code is returned.

Error Codes

The pthread_condattr_getpshared subroutine is unsuccessful if the following is true:

EINVAL	The attr parameter is not valid.
ENOSYS	The process sharing POSIX option is not implemented.

Implementation Specifics

This subroutine is part of the Base Operating System (BOS) Runtime.

Related Information

The pthread_condattr_setpshared subroutine, pthread_condattr_init subroutine.

Advanced Attributes in AIX Version 4.3 General Programming Concepts: Writing and Debugging Programs.

Threads Library Options in AIX Version 4.3 General Programming Concepts: Writing and Debugging Programs.

Threads Library Quick Reference in AIX Version 4.3 General Programming Concepts: Writing and Debugging Programs.