separate testing environment

-Separate main for running unit tests
-Move unit tests into testing folder

Engine/source/testing/semaphoreTest.cpp

@@ -0,0 +1,87 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) 2014 GarageGames, LLC
+//
+// 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 "testing/unitTesting.h"
+#include "platform/threads/semaphore.h"
+#include "platform/threads/thread.h"
+
+TEST(Semaphore, BasicSynchronization)
+{
+   Semaphore *sem1 = new Semaphore(1);
+   Semaphore *sem2 = new Semaphore(1);
+
+   // Test that we can do non-blocking acquires that succeed.
+   EXPECT_TRUE(sem1->acquire(false))
+      << "Should succeed at acquiring a new semaphore with count 1.";
+   EXPECT_TRUE(sem2->acquire(false))
+      << "This one should succeed too, see previous test.";
+
+   // Test that we can do non-blocking acquires that fail.
+   EXPECT_FALSE(sem1->acquire(false))
+      << "Should failed, as we've already got the sem.";
+   sem1->release();
+   EXPECT_FALSE(sem2->acquire(false))
+      << "Should also fail.";
+   sem2->release();
+
+   // Test that we can do blocking acquires that succeed.
+   EXPECT_TRUE(sem1->acquire(true))
+      << "Should succeed as we just released.";
+   EXPECT_TRUE(sem2->acquire(true))
+      << "Should succeed as we just released.";
+
+   // Clean up.
+   delete sem1;
+   delete sem2;
+}
+
+TEST(Semaphore, MultiThreadSynchronization)
+{
+   Semaphore semaphore(1);
+
+   struct thread
+   {
+      // Try to acquire the semaphore from another thread.
+      static void body1(void* sem)
+      {
+         Semaphore *semaphore = reinterpret_cast<Semaphore*>(sem);
+         EXPECT_TRUE(semaphore->acquire(true));
+         // Note that this semaphore is never released. Bad programmer!
+      }
+      // One more acquisition should fail!
+      static void body2(void* sem)
+      {
+         Semaphore *semaphore = reinterpret_cast<Semaphore*>(sem);
+         EXPECT_FALSE(semaphore->acquire(false));
+      }
+   };
+
+   Thread thread1(&thread::body1, &semaphore);
+   EXPECT_TRUE(semaphore.acquire(true));
+   thread1.start();
+   semaphore.release();
+   thread1.join();
+
+   Thread thread2(&thread::body2, &semaphore);
+   thread2.start();
+   thread2.join();
+}