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# PR_CNotify
Notify a thread waiting on a change in the state of monitored data.
## Syntax
```{code}
#include <prcmon.h>
PRStatus PR_CNotify(void *address);
```
### Parameter
The function has the following parameter:
`address`
: The address of the monitored object. The calling thread must be in
the monitor defined by the value of the address.
### Returns
> - `PR_SUCCESS` indicates that the calling thread is the holder of the
> mutex for the monitor referred to by the address parameter.
> - `PR_FAILURE` indicates that the monitor has not been entered by the
> calling thread.
## Description
Using the value specified in the `address` parameter to find a monitor
in the monitor cache, {ref}`PR_CNotify` notifies single a thread waiting
for the monitor's state to change. If a thread is waiting on the monitor
(having called {ref}`PR_CWait`), then that thread is made ready. As soon as
the thread is scheduled, it attempts to reenter the monitor.