# 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.