# PR_NotifyAllCondVar

Notifies all of the threads waiting on a specified condition variable.

## Syntax

```{code}
#include <prcvar.h>

PRStatus PR_NotifyAllCondVar(PRCondVar *cvar);
```

### Returns

The function returns one of the following values:

- If successful, `PR_SUCCESS`.
- If unsuccessful (for example, if the caller has not locked the lock
  associated with the condition variable), `PR_FAILURE`.

## Description

The calling thread must hold the lock that protects the condition, as
well as the invariants that are tightly bound to the condition.

A call to {ref}`PR_NotifyAllCondVar` causes all of the threads waiting on
the specified condition variable to be promoted to a ready state. If no
threads are waiting, the operation is no-op.