From 30756e3f952cfb790b5c5f503d82eea3ea938814 Mon Sep 17 00:00:00 2001
From: Mattes D <github@xoft.cz>
Date: Sun, 15 Jan 2017 15:11:18 +0100
Subject: Tests: Added LuaState thread stress-test.

---
 tests/LuaThreadStress/LuaThreadStress.cpp | 154 ++++++++++++++++++++++++++++++
 1 file changed, 154 insertions(+)
 create mode 100644 tests/LuaThreadStress/LuaThreadStress.cpp

(limited to 'tests/LuaThreadStress/LuaThreadStress.cpp')

diff --git a/tests/LuaThreadStress/LuaThreadStress.cpp b/tests/LuaThreadStress/LuaThreadStress.cpp
new file mode 100644
index 000000000..f4d782ddc
--- /dev/null
+++ b/tests/LuaThreadStress/LuaThreadStress.cpp
@@ -0,0 +1,154 @@
+// LuaThreadStress.cpp
+
+// Implements a stress-test of cLuaState under several threads
+
+#include "Globals.h"
+#include "Bindings/LuaState.h"
+#include <thread>
+#include <random>
+
+
+
+
+
+/** How long the threading test should run. */
+static const int NUM_SECONDS_TO_TEST = 10;
+
+
+
+
+
+/** Retrieves a callback from the Lua state that can be later called.
+Calls the Lua function getCallback with a_Seed param to retrieve the callback. */
+static cLuaState::cCallbackPtr getCallback(cLuaState & a_LuaState, unsigned a_Seed)
+{
+	cLuaState::cLock lock(a_LuaState);
+	cLuaState::cCallbackPtr res;
+	a_LuaState.Call("getCallback", a_Seed, cLuaState::Return, res);
+	return res;
+}
+
+
+
+
+
+/** Runs a single thread that stress-tests the cLuaState object.
+a_LuaState is the Lua state on which to operate.
+a_Seed is the seed for the random number generator for this thread.
+a_ShouldTerminate is a bool flag that another thread sets to ask this thread to terminate.
+a_FailResult is a shared result state that is written by any thread upon failure (so if it contains nonzero, at least one thread has failed). */
+static void runStress(cLuaState * a_LuaState, unsigned a_Seed, std::atomic<bool> * a_ShouldTerminate, std::atomic<int> * a_FailResult)
+{
+	std::minstd_rand rnd;
+	rnd.seed(a_Seed);
+	auto callbackSeed = static_cast<unsigned>(rnd());
+	auto callback = getCallback(*a_LuaState, callbackSeed);
+	while (!a_ShouldTerminate->load())
+	{
+		// Pick a random operation on the Lua state and peform it:
+		switch (rnd() % 4)
+		{
+			case 0:
+			{
+				// Get a new callback:
+				callbackSeed = callbackSeed + 1;
+				callback = getCallback(*a_LuaState, callbackSeed);
+				break;
+			}
+
+			default:
+			{
+				// Call the callback, if still available:
+				auto param = static_cast<unsigned>(rnd());
+				unsigned returnValue;
+				if (callback->Call(param, cLuaState::Return, returnValue))
+				{
+					if (returnValue != param + callbackSeed)
+					{
+						LOGWARNING("Bad value returned from the callback");
+						*a_FailResult = 2;
+						a_ShouldTerminate->store(true);
+						return;
+					}
+				}
+				break;
+			}
+		}  // switch (random)
+
+		// Once in every ~10k operations, reload the lua state completely:
+		if ((rnd() % 10000) == 0)
+		{
+			cLuaState::cLock lock(*a_LuaState);
+			a_LuaState->Close();
+			a_LuaState->Create();
+			if (!a_LuaState->LoadFile("Test.lua"))
+			{
+				*a_FailResult = 3;
+				a_ShouldTerminate->store(true);
+				return;
+			}
+		}
+	}  // while (!a_ShouldTerminate)
+}
+
+
+
+
+
+static int DoTest(void)
+{
+	cLuaState L("LuaThreadStress test");
+	L.Create();
+	if (!L.LoadFile("Test.lua"))
+	{
+		return 1;
+	}
+
+	// Start the concurrect threads:
+	std::atomic<bool> shouldTerminate(false);
+	std::atomic<int> failResult(0);
+	std::thread threads[] =
+	{
+		std::thread(runStress, &L, 0, &shouldTerminate, &failResult),
+		std::thread(runStress, &L, 1, &shouldTerminate, &failResult),
+		std::thread(runStress, &L, 2, &shouldTerminate, &failResult),
+		std::thread(runStress, &L, 3, &shouldTerminate, &failResult),
+	};
+
+	// Let the threads run wild:
+	for (int i = 1; i <= NUM_SECONDS_TO_TEST; ++i)
+	{
+		std::this_thread::sleep_for(std::chrono::seconds(1));
+		LOG("Testing (%d out of %d seconds)...", i, NUM_SECONDS_TO_TEST);
+	}
+
+	// Terminate everything:
+	LOG("Terminating the threads");
+	shouldTerminate = true;
+	for (auto & t: threads)
+	{
+		t.join();
+	}
+	LOG("Threads terminated.");
+
+	return failResult.load();
+}
+
+
+
+
+
+int main()
+{
+	LOG("LuaThreadStress starting.");
+
+	int res = DoTest();
+	LOG("LuaThreadStress test done: %s", (res == 0) ? "success" : "failure");
+	if (res != 0)
+	{
+		return res;
+	}
+
+	LOG("LuaThreadStress finished.");
+	return 0;
+}
-- 
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