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

     pthread_key_delete -- delete a thread-specific data key

     #include <pthread.h>

     pthread_key_delete(pthread_key_t key);

     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 applica-tion application
     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.

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

     pthread_key_delete() will fail if:

     [EINVAL]           The key value is invalid.

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

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

BSD                              April 4, 1996                             BSD