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# 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.