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73 lines
1.6 KiB
73 lines
1.6 KiB
/*
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* Copyright (c) 2017 - present Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#include <mutex>
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namespace basics {
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class UniqueLock {
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public:
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UniqueLock() {}
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void set(int new_value) {
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std::unique_lock<std::mutex> g(mutex_);
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well_guarded1 = new_value;
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suspiciously_read1 = new_value;
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g.unlock();
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not_guarded1 = new_value;
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suspiciously_written1 = new_value;
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}
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void set2(int new_value) {
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std::unique_lock<std::mutex> g(mutex_, std::defer_lock);
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not_guarded2 = new_value;
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suspiciously_written2 = new_value;
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g.lock();
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well_guarded2 = new_value;
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suspiciously_read2 = new_value;
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g.unlock();
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}
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int get1() {
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int result;
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std::lock_guard<std::mutex> lock(mutex_);
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result = well_guarded1;
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return result + well_guarded2;
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}
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int get2() {
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int result;
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std::lock_guard<std::mutex> lock(mutex_);
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result = suspiciously_written1;
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return result + suspiciously_written2;
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}
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int get3() {
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int result = not_guarded1;
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return result + not_guarded2;
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}
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int get4() {
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int result = suspiciously_read1;
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return result + suspiciously_read2;
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}
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private:
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int well_guarded1;
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int suspiciously_read1;
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int suspiciously_written1;
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int not_guarded1;
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int well_guarded2;
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int suspiciously_read2;
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int suspiciously_written2;
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int not_guarded2;
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std::mutex mutex_;
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};
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}
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