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# PR_JoinThreadPool
Waits for all threads in a thread pool to complete, then releases
resources allocated to the thread pool.
## Syntax
```{code}
#include <prtpool.h>
NSPR_API(PRStatus) PR_JoinThreadPool( PRThreadPool *tpool );
```
### Parameter
The function has the following parameter:
`tpool`
: A pointer to a {ref}`PRThreadPool` structure previously created by a
call to {ref}`PR_CreateThreadPool`.
### Returns
{ref}`PRStatus`