osx man page for pthread_key_delete

PTHREAD_KEY_DELETE(3)					   BSD Library Functions Manual 				     PTHREAD_KEY_DELETE(3)

NAME
     pthread_key_delete -- delete a thread-specific data key

SYNOPSIS
     #include <pthread.h>

     int
     pthread_key_delete(pthread_key_t key);

DESCRIPTION
     The pthread_key_delete() function deletes a thread-specific data key, previously returned by pthread_key_create().  The thread-specific data
     values associated with key need not be NULL at the time that pthread_key_delete() is called.  It is the responsibility of the application 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.  Otherwise, 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