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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 applica-tion application
     tion storage or perform any cleanup actions for data structures related to the deleted key or associ-ated associated
     ated 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