From f97d1e15699d281911274911f83acbdc07e1f27e Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Fri, 26 Jul 2013 21:06:05 +0200
Subject: Queue optimizations

---
 mmss/queue.hpp | 33 +++++++++++++++++++--------------
 1 file changed, 19 insertions(+), 14 deletions(-)

(limited to 'mmss')

diff --git a/mmss/queue.hpp b/mmss/queue.hpp
index 2cdb2a1..1b1d2af 100644
--- a/mmss/queue.hpp
+++ b/mmss/queue.hpp
@@ -29,9 +29,8 @@
 
 #include "types.hpp"
 
-#include <deque>
+#include <list>
 #include <memory>
-#include <queue>
 
 namespace MMSS {
 
@@ -40,30 +39,36 @@ template<typename T> class timeout_queue_t {
 		std::shared_ptr<T> data;
 		uint64_t timeout;
 
-		element_t(std::shared_ptr<T> data0, uint64_t timeout0) : data(data0), timeout(timeout0) {}
-
-		bool operator<(const element_t &e) const {
-			return timeout > e.timeout;
-		}
+		element_t(const std::shared_ptr<T> &data0, uint64_t timeout0) : data(data0), timeout(timeout0) {}
 	};
 
 	context_t *mmss;
 
-	std::priority_queue<element_t, std::deque<element_t>> queue;
+	std::list<element_t> queue;
 
 public:
 	timeout_queue_t(context_t *mmss0) : mmss(mmss0) {}
 
-	void put(std::shared_ptr<T> data, uint64_t timeout) {
-		queue.push(element_t(data, timeout));
+	void put(const std::shared_ptr<T> &data, uint64_t timeout) {
+		auto it = queue.begin(), end = queue.end();
+
+		while (it != end && it->timeout < timeout)
+			++it;
+
+		queue.insert(it, element_t(data, timeout));
 	}
 
 	std::shared_ptr<T> get() {
-		if (queue.empty() || queue.top().timeout > now(mmss))
+		if (queue.empty())
+			return std::shared_ptr<T>();
+
+		element_t &el = queue.front();
+
+		if (el.timeout > now(mmss))
 			return std::shared_ptr<T>();
 
-		std::shared_ptr<T> ret = queue.top().data;
-		queue.pop();
+		std::shared_ptr<T> ret(std::move(el.data));
+		queue.pop_front();
 		return ret;
 	}
 
@@ -71,7 +76,7 @@ public:
 		if (queue.empty())
 			return -1;
 
-		int diff = queue.top().timeout - now(mmss);
+		int diff = queue.front().timeout - now(mmss);
 
 		if (diff < 0)
 			return 0;
-- 
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