Add support for GT-Pin Callbacks [3/n]

Change-Id: Iea4b49efc9a666fde310ece15a9c69686d22f627

unit_tests/utilities/spinlock_tests.cpp

@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2017, Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "runtime/utilities/spinlock.h"
+#include "gtest/gtest.h"
+#include <thread>
+
+using namespace OCLRT;
+
+TEST(SpinLockTest, givenTwoThreadsThenVerifyThatTheySynchronizeWithSpinLock) {
+    std::atomic_flag syncLock = ATOMIC_FLAG_INIT;
+    std::atomic<bool> threadStarted(false);
+    std::atomic<bool> threadFinished(false);
+    SpinLock lock1;
+    int sharedCount = 0;
+
+    // Initially acquire spin lock so the worker thread will wait
+    lock1.enter(syncLock);
+
+    // Start worker thread
+    std::thread t([&]() {
+        threadStarted = true;
+        SpinLock lock2;
+        lock2.enter(syncLock);
+        sharedCount++;
+        EXPECT_EQ(2, sharedCount);
+        lock2.leave(syncLock);
+        threadFinished = true;
+    });
+
+    // Wait till worker thread is started
+    while (!threadStarted) {
+    };
+    sharedCount++;
+    EXPECT_EQ(1, sharedCount);
+
+    // Release spin lock thus allowing worker thread to proceed
+    lock1.leave(syncLock);
+
+    // Wait till worker thread finishes
+    while (!threadFinished) {
+    };
+    EXPECT_EQ(2, sharedCount);
+    t.join();
+}