From aa3855d5836d2a2d83baafdf6e40caf90d3dad1c Mon Sep 17 00:00:00 2001
From: Jeff Brown <jeffbrown@google.com>
Date: Thu, 17 Mar 2011 01:34:19 -0700
Subject: Refactor how timeouts are calculated.

Added a timeout mechanism to EventHub and InputReader so that
InputMappers can request timeouts to perform delayed processing of
input when needed.

Change-Id: Iec2045baaf4e67690b15eef3c09a58d5cac76897
---
 libs/utils/Timers.cpp | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'libs/utils/Timers.cpp')

diff --git a/libs/utils/Timers.cpp b/libs/utils/Timers.cpp
index 784f035dc03a..64a29f58776a 100644
--- a/libs/utils/Timers.cpp
+++ b/libs/utils/Timers.cpp
@@ -26,6 +26,7 @@
 #include <sys/time.h>
 #include <time.h>
 #include <errno.h>
+#include <limits.h>
 
 #ifdef HAVE_WIN32_THREADS
 #include <windows.h>
@@ -53,6 +54,23 @@ nsecs_t systemTime(int clock)
 #endif
 }
 
+int toMillisecondTimeoutDelay(nsecs_t referenceTime, nsecs_t timeoutTime)
+{
+    int timeoutDelayMillis;
+    if (timeoutTime > referenceTime) {
+        uint64_t timeoutDelay = uint64_t(timeoutTime - referenceTime);
+        if (timeoutDelay > uint64_t((INT_MAX - 1) * 1000000LL)) {
+            timeoutDelayMillis = -1;
+        } else {
+            timeoutDelayMillis = (timeoutDelay + 999999LL) / 1000000LL;
+        }
+    } else {
+        timeoutDelayMillis = 0;
+    }
+    return timeoutDelayMillis;
+}
+
+
 /*
  * ===========================================================================
  *      DurationTimer
-- 
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