HH\Lib\File\Handle::lock

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The containing class is available as File\Handle in the www repository.

Get a shared or exclusive lock on the file

public function lock(
  HH\Lib\File\LockType $type,
): HH\Lib\File\Lock;

This will block until it acquires the lock, which may be forever.

This involves a blocking syscall; async code will not execute while waiting for a lock.

Parameters