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# PR_CNotifyAll
Notifies all the threads waiting for a change in the state of monitored
data.
## Syntax
```{code}
#include <prcmon.h>
PRStatus PR_CNotifyAll(void *address);
```
### Parameter
The function has the following parameter:
`address`
: The address of the monitored object. The calling thread must be in
the monitor at the time {ref}`PR_CNotifyAll` is called.
### Returns
> - `PR_SUCCESS` indicates that the referenced monitor was located and
> the calling thread was in the monitor.
> - `PR_FAILURE` indicates that the referenced monitor could not be
> located or that the calling thread was not in the monitor
## Description
Using the value specified in the address parameter to find a monitor in
the monitor cache, {ref}`PR_CNotifyAll` notifies all threads waiting for
the monitor's state to change. All of the threads waiting on the state
change are then scheduled to reenter the monitor.