hphp/hack/manual/hsl/Classes/HH.Lib.File/Lock/index.md
:::info[Note] This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information. :::
A File Lock, which is unlocked as a disposable
To acquire one, call lock
on a Base object.
Note that in some cases, such as the non-blocking lock types, we may throw
an LockAcquisitionException instead of acquiring the lock. If this
is not desired behavior it should be guarded against.
namespace HH\Lib\File;
final class Lock implements \IDisposable {...}