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# PRThreadPrivateDTOR
The destructor function passed to PR_NewThreadPrivateIndex that is
associated with the resulting thread private index.
## Syntax
```{code}
#include <prthread.h>
typedef void (PR_CALLBACK *PRThreadPrivateDTOR)(void *priv);
```
### Description
Until the data associated with an index is actually set with a call to
{ref}`PR_SetThreadPrivate`, the value of the data is `NULL`. If the data
associated with the index is not `NULL`, NSPR passes a reference to
the data to the destructor function when the thread terminates.