January 30, 2003 PTHREAD_RWLOCKATTR 3

### NAME

pthread_rwlockattr_init, pthread_rwlockattr_destroy - initialize or destroy read/write lock attributes

### LIBRARY

POSIX Thread Library (libpthread, -lpthread)

### SYNOPSIS

```int` pthread_rwlockattr_init(```pthread_rwlockattr_t *attr`)
```int` pthread_rwlockattr_destroy(```pthread_rwlockattr_t *attr`)

### DESCRIPTION

The pthread_rwlockattr_init(``) function is used to initialize a read/write lock attributes object.

The pthread_rwlockattr_destroy(``) function is used to destroy a read/write lock attribute object previously created with pthread_rwlockattr_init(``).

### RETURN VALUES

If successful, the pthread_rwlockattr_init(``) and pthread_rwlockattr_destroy(``) functions return zero. Otherwise an error number will be returned to indicate the error.

### ERRORS

pthread_rwlockattr_init(``) shall fail if:

[```ENOMEM`]
  Insufficient memory exists to initialize the read/write lock attributes object.

pthread_rwlockattr_init(``) and pthread_rwlockattr_destroy(``) may fail if:

[```EINVAL`]
  The value specified by ```attr` is invalid.

### SEE ALSO

pthread_rwlock_init(3)

### STANDARDS

The pthread_rwlockattr_init(``) and pthread_rwlockattr_destroy(``) functions conform to ISO/IEC 9945-1:1996 (``POSIX.1'') .