#include <pthread.h>
int pthread_rwlockattr_init(pthread_rwlockattr_t *attr);
Threadsafe: Yes
Signal Safe: Yes

The pthread_rwlockattr_init() function initializes the read/write lock attributes object referenced by attr to the default attributes. The read/write lock attributes object can be used in a call to pthread_rwlock_init() to create a read/write lock.

Attribute	Default value	supported values
pshared	PTHREAD_PROCESS_PRIVATE	PTHREAD_PROCESS_PRIVATE or PTHREAD_PROCESS_SHARED

Parameters

attr

(Output) Address of the variable to contain the read/write lock attributes object.

None.

Return Value

0

pthread_rwlockattr_init() was successful.

value

pthread_rwlockattr_init() was not successful. value is set to indicate the error condition.

If pthread_rwlockattr_init() was not successful, the error condition returned usually indicates one of the following errors. Under some conditions, the value returned could indicate an error other than those listed here.

[EINVAL]

The value specified for the argument is not correct.

• The <pthread.h> header file. See Header files for Pthread functions
• pthread_rwlockattr_destroy()--Destroy Read/Write Lock Attribute
• pthread_rwlock_init()--Initialize a Read/Write Lock

See the pthread_rwlockattr_destroy() example.