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PTHREAD_KEY_DELETE(3) Library Functions Manual PTHREAD_KEY_DELETE(3)

pthread_key_delete
delete a thread-specific data key

#include <pthread.h>
int
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 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.

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

pthread_key_delete() will fail if:
 
 
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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”).
June 5, 2013 OpenBSD-current