Started working on multithreaded rooms

server/thread_safe_queue.hpp

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+/* Copyright: (c) Kayne Ruse 2013
+ * 
+ * This software is provided 'as-is', without any express or implied
+ * warranty. In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ * 
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ * 
+ * 1. The origin of this software must not be misrepresented; you must not
+ * claim that you wrote the original software. If you use this software
+ * in a product, an acknowledgment in the product documentation would be
+ * appreciated but is not required.
+ * 
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ * misrepresented as being the original software.
+ * 
+ * 3. This notice may not be removed or altered from any source
+ * distribution.
+*/
+#ifndef THREADSAFEQUEUE_HPP_
+#define THREADSAFEQUEUE_HPP_
+
+#include "SDL/SDL_thread.h"
+
+#include <deque>
+#include <stdexcept>
+
+/* This container is a thread safe reimplementation of std::queue.
+*/
+
+template<typename T, class Container = std::deque<T>>
+class ThreadSafeQueue {
+public:
+	ThreadSafeQueue() {
+		lock = SDL_CreateSemaphore(1);
+		if (!lock) {
+			throw(std::runtime_error("Failed to create ThreadSafeQueue::lock"));
+		}
+	}
+
+	~ThreadSafeQueue() {
+		SDL_SemWait(lock);
+		container.clear();
+		SDL_SemPost(lock);
+		SDL_DestroySemaphore(lock);
+	}
+
+	T PushBack(T t) {
+		SDL_SemWait(lock);
+		container.push_back(t);
+		SDL_SemPost(lock);
+		return t;
+	}
+
+	T PeekFront() {
+		T t;
+		SDL_SemWait(lock);
+		if (container.size() > 0) {
+			t = container[0];
+		}
+		SDL_SemPost(lock);
+		return t;
+	}
+
+	T PopFront() {
+		T t;
+		SDL_SemWait(lock);
+		if (container.size() > 0) {
+			t = container[0];
+			container.pop_front();
+		}
+		SDL_SemPost(lock);
+		return t;
+	}
+
+	int Size() {
+		//can't be sure if std::deque::size() is thread safe
+		int ret;
+		SDL_SemWait(lock);
+		ret = container.size();
+		SDL_SemPost(lock);
+		return ret;
+	}
+
+private:
+	Container container;
+	SDL_sem* lock;
+};
+
+#endif