pthread_condattr_setpshared Subroutine

Purpose

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

Library

Threads Library (libpthreads.a)

Syntax

#include <pthread.h>

int pthread_condattr_setpshared (attr, pshared)
pthread_condattr_t *attr;
int pshared;

Description

The pthread_condattr_setpshared subroutine sets the value of the pshared attribute of the condition attributes object attr. This attribute specifies the process sharing of the condition variable created with this attributes object.

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

Item	Description
attr	Specifies the condition attributes object.
pshared	Specifies the process sharing to set. It must 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.

Item

Description

attr

Specifies the condition attributes object.

pshared

Specifies the process sharing to set. It must 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.

Return Values

Upon successful completion, 0 is returned. Otherwise, an error code is returned.

Error Codes

The pthread_condattr_setpshared subroutine is unsuccessful if the following is true:

Item	Description
EINVAL	The attr or pshared parameters are not valid.