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# PRLock
A mutual exclusion lock.
## Syntax
```{code}
#include <prlock.h>
typedef struct PRLock PRLock;
```
## Description
NSPR represents a lock as an opaque entity to clients of the functions
described in ["Locks"](en/NSPR_API_Reference/Locks). Functions that
operate on locks do not have timeouts and are not interruptible.