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# PR_Unlock
Releases a specified lock object. Releasing an unlocked lock results in
an error.
Attempting to release a lock that was locked by a different thread
causes undefined behavior.
## Syntax
```{code}
#include <prlock.h>
PRStatus PR_Unlock(PRLock *lock);
```
### Parameter
{ref}`PR_Unlock` has one parameter:
`lock`
: A pointer to a lock object to be released.
### Returns
The function returns one of the following values:
- If successful, `PR_SUCCESS`.
- If unsuccessful (for example, if the caller does not own the lock),
`PR_FAILURE`.
## See Also
- [PR_Lock](PR_Lock)