int
     pthread_key_delete(pthread_key_t key);

DESCRIPTION

     The pthread_key_delete() function deletes a thread-specific data key pre-
     viously returned by pthread_key_create().  The thread-specific data val-
     ues associated with key need not be NULL at the time that
     pthread_key_delete() is called.  It is the responsibility of the applica-
     tion to free any application storage or perform any cleanup actions for
     data structures related to the deleted key or associated thread-specific
     data in any threads; this cleanup can be done either before or after
     pthread_key_delete() is called.  Any attempt to use key following the
     call to pthread_key_delete() results in undefined behavior.

     The pthread_key_delete() function is callable from within destructor
     functions.  Destructor functions are not invoked by pthread_key_delete().
     Any destructor function that may have been associated with key will no
     longer be called upon thread exit.

RETURN VALUES

     If successful, the pthread_key_delete() function will return zero.  Oth-
     erwise an error number will be returned to indicate the error.

ERRORS

     pthread_key_delete() will fail if:

     [EINVAL]           The key value is invalid.

SEE ALSO

     pthread_getspecific(3), pthread_key_create(3), pthread_setspecific(3)

STANDARDS

     pthread_key_delete() conforms to ISO/IEC 9945-1:1996 (``POSIX.1'').

BSD                              April 4, 1996                             BSD