pthread_rwlockattr_init(3C)											       pthread_rwlockattr_init(3C)

NAME

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

SYNOPSIS

       cc -mt [ flag... ] file... -lpthread [ library... ]
       #include <pthread.h>

       int pthread_rwlockattr_init(pthread_rwlockattr_t *attr);

       int pthread_rwlockattr_destroy(pthread_rwlockattr_t *attr);

       The  pthread_rwlockattr_init()  function  initializes  a  read-write  lock  attributes  object  attr  with the default value for all of the
       attributes defined by the implementation.

       Results are undefined if pthread_rwlockattr_init() is called specifying an already initialized read-write lock attributes object.

       After a read-write lock attributes object has been used to initialize one or more read-write locks, any function affecting  the	attributes
       object (including destruction) does not affect any previously initialized read-write locks.

       The pthread_rwlockattr_destroy() function destroys a read-write lock attributes object. The effect of subsequent use of the object is unde-
       fined until the object is re-initialized by  another  call  to  pthread_rwlockattr_init().  An  implementation  can  cause  pthread_rwlock-
       attr_destroy() to set the object referenced by attr to an invalid value.

       If successful, the pthread_rwlockattr_init() and pthread_rwlockattr_destroy() functions return 0. Otherwise, an error number is returned to
       indicate the error.

       The pthread_rwlockattr_init() function will fail if:

       ENOMEM	       Insufficient memory exists to initialize the read-write lock attributes object.

       The pthread_rwlockattr_destroy() function may fail if:

       EINVAL	       The value specified by attr is invalid.

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

       pthread_rwlock_init(3C),   pthread_rwlock_rdlock(3C),   pthread_rwlock_unlock(3C),   pthread_rwlock_wrlock(3C),	  pthread_rwlockattr_getp-
       shared(3C), attributes(5), standards(5)

								    23 Mar 2005 				       pthread_rwlockattr_init(3C)