package hack_parallel
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doc/hack_parallel.interface/Hack_parallel_intf/Std/Lock/index.html
Module Std.Lock
* Copyright (c) 2015, Facebook, Inc. * All rights reserved. * * This source code is licensed under the BSD-style license found in the * LICENSE file in the root directory of this source tree. An additional grant * of patent rights can be found in the PATENTS file in the same directory. *
* Basic lock operations. * * We use these for two reasons: * 1. making sure we are only running one instance of hh_server per person on a given dev box * 2. giving a way to hh_client to check if a server is running.
val register_lock : SMap.key -> Unix.file_descrval _operations : SMap.key -> Unix.lock_command -> bool* Grab or check if a file lock is available. * * Returns true if the lock is/was available, false otherwise.
val grab : SMap.key -> bool* Grabs the file lock and returns true if it the lock was grabbed
val release : SMap.key -> bool* Releases a file lock.
val blocking_grab_then_release : SMap.key -> unitval fd_of : SMap.key -> int* Gets the server instance-unique integral fd for a given lock file.
val check : SMap.key -> bool* Check if the file lock is available without grabbing it. * Returns true if the lock is free.