From 410932330c9a4e1ee92c617c2ce5d98af9ed0912 Mon Sep 17 00:00:00 2001
From: Maxime Coste <frrrwww@gmail.com>
Date: Thu, 30 Jan 2014 12:41:34 +0000
Subject: [PATCH] EventManager now wakes up for next timer rather than running
 a 10Hz

---
 src/event_manager.cc | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/event_manager.cc b/src/event_manager.cc
index 3d0c9f31..4f944b5d 100644
--- a/src/event_manager.cc
+++ b/src/event_manager.cc
@@ -47,14 +47,22 @@ EventManager::~EventManager()
 
 void EventManager::handle_next_events()
 {
-    const int timeout_ms = 100;
     std::vector<pollfd> events;
     events.reserve(m_fd_watchers.size());
     for (auto& watcher : m_fd_watchers)
         events.emplace_back(pollfd{ watcher->fd(), POLLIN | POLLPRI, 0 });
     std::vector<int> forced;
     std::swap(forced, m_forced_fd);
-    poll(events.data(), events.size(), timeout_ms);
+
+    TimePoint next_timer = TimePoint::max();
+    for (auto& timer : m_timers)
+    {
+        if (timer->next_date() <= next_timer)
+            next_timer = timer->next_date();
+    }
+    auto timeout = std::chrono::duration_cast<std::chrono::milliseconds>(next_timer - Clock::now());
+
+    poll(events.data(), events.size(), std::max(0, (int)timeout.count()));
     for (size_t i = 0; i < events.size(); ++i)
     {
         auto& event = events[i];