pthread_mutexattr_setpshared()

Set the process-shared attribute in mutex attribute object

Synopsis:

#include <pthread.h>

int pthread_mutexattr_setpshared( 
                         pthread_mutexattr_t* attr,
                         int pshared );

Arguments:

attr

A pointer to the pthread_mutexattr_t object that you want to set the attribute in.

pshared

The new value of the process-shared attribute; one of:

• PTHREAD_PROCESS_SHARED — any thread that has access to the memory where the mutex is allocated can operate on it, even if the mutex is allocated in memory that's shared by multiple processes.
• PTHREAD_PROCESS_PRIVATE — the mutex can be accessed only by threads created within the same process as the thread that initialized the mutex; if threads from other processes try to access the PTHREAD_PROCESS_PRIVATE mutex, the behavior is undefined.

The default value of the process-shared attribute is PTHREAD_PROCESS_PRIVATE.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The pthread_mutexattr_setpshared() function sets the process-shared attribute in a mutex attribute object, attr, to the value given by pshared.

Returns:

EOK

Success.

EINVAL

Invalid mutex attribute object, attr.

EINVAL

The new value specified in pshared isn't PTHREAD_PROCESS_SHARED or PTHREAD_PROCESS_PRIVATE.

Classification:

POSIX 1003.1 THR TSH

See also:

pthread_cond_init(), pthread_create(), pthread_mutexattr_getpshared(), pthread_mutexattr_getrecursive(), pthread_mutex_init(), pthread_mutexattr_setrecursive()