2 * Copyright 2014 Facebook, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #include <gflags/gflags.h>
18 #include <glog/logging.h>
20 #include "folly/File.h"
22 DEFINE_bool(s, false, "get shared lock");
23 DEFINE_bool(x, false, "get exclusive lock");
25 int main(int argc, char *argv[]) {
26 google::ParseCommandLineFlags(&argc, &argv, true);
27 google::InitGoogleLogging(argv[0]);
28 CHECK_EQ(FLAGS_s + FLAGS_x, 1)
29 << "exactly one of -s and -x must be specified";
31 folly::File f(argv[1], O_RDWR);
34 r = f.try_lock_shared();