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# PR_NotifyAll
Promotes all threads waiting on a specified monitor to a ready state.
## Syntax
```{code}
#include <prmon.h>
PRStatus PR_NotifyAll(PRMonitor *mon);
```
### Parameters
The function has the following parameter:
`mon`
: A reference to an existing structure of type {ref}`PRMonitor`. The
monitor object referenced must be one for which the calling thread
currently holds the lock.
### Returns
The function returns one of the following values:
- If successful, `PR_SUCCESS`.
- If unsuccessful, `PR_FAILURE`.
## Description
A call to {ref}`PR_NotifyAll` causes all of the threads waiting on the
monitor to be scheduled to be promoted to a ready state. If no threads
are waiting, the operation is no-op.
{ref}`PR_NotifyAll` should be used with some care. The expense of
scheduling multiple threads increases dramatically as the number of
threads increases.