65 lines
2.2 KiB
C++
65 lines
2.2 KiB
C++
/*
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* Copyright (c) 2017, Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "runtime/utilities/spinlock.h"
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#include "gtest/gtest.h"
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#include <thread>
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using namespace OCLRT;
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TEST(SpinLockTest, givenTwoThreadsThenVerifyThatTheySynchronizeWithSpinLock) {
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std::atomic_flag syncLock = ATOMIC_FLAG_INIT;
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std::atomic<bool> threadStarted(false);
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std::atomic<bool> threadFinished(false);
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SpinLock lock1;
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int sharedCount = 0;
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// Initially acquire spin lock so the worker thread will wait
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lock1.enter(syncLock);
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// Start worker thread
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std::thread t([&]() {
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threadStarted = true;
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SpinLock lock2;
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lock2.enter(syncLock);
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sharedCount++;
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EXPECT_EQ(2, sharedCount);
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lock2.leave(syncLock);
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threadFinished = true;
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});
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// Wait till worker thread is started
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while (!threadStarted) {
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};
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sharedCount++;
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EXPECT_EQ(1, sharedCount);
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// Release spin lock thus allowing worker thread to proceed
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lock1.leave(syncLock);
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// Wait till worker thread finishes
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while (!threadFinished) {
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};
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EXPECT_EQ(2, sharedCount);
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t.join();
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}
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