From 0b37987027174067f8ce9d30ea4c573bfff76ea0 Mon Sep 17 00:00:00 2001
From: dhacker29 <davidhackerdvm@gmail.com>
Date: Tue, 5 Nov 2013 00:35:16 -0600
Subject: [PATCH] Add back DurationTimer to fix camera.msm8960 load

cannot locate symbol "_ZN7android13DurationTimer5startEv"

Change-Id: I29d3283b644c773e6d798d17b2ef139a470048da
---
 include/utils/Timers.h | 39 ++++++++++++++++++++++++++
 libutils/Timers.cpp    | 62 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 101 insertions(+)

diff --git a/include/utils/Timers.h b/include/utils/Timers.h
index d0154216..92f66c94 100644
--- a/include/utils/Timers.h
+++ b/include/utils/Timers.h
@@ -103,4 +103,43 @@ int toMillisecondTimeoutDelay(nsecs_t referenceTime, nsecs_t timeoutTime);
 } // extern "C"
 #endif
 
+// ------------------------------------------------------------------
+// C++ API
+
+#ifdef __cplusplus
+
+namespace android {
+/*
+ * Time the duration of something.
+ *
+ * Includes some timeval manipulation functions.
+ */
+class DurationTimer {
+public:
+    DurationTimer() {}
+    ~DurationTimer() {}
+
+    // Start the timer.
+    void start();
+    // Stop the timer.
+    void stop();
+    // Get the duration in microseconds.
+    long long durationUsecs() const;
+
+    // Subtract two timevals.  Returns the difference (ptv1-ptv2) in
+    // microseconds.
+    static long long subtractTimevals(const struct timeval* ptv1,
+        const struct timeval* ptv2);
+
+    // Add the specified amount of time to the timeval.
+    static void addToTimeval(struct timeval* ptv, long usec);
+
+private:
+    struct timeval  mStartWhen;
+    struct timeval  mStopWhen;
+};
+
+}; // android
+#endif // def __cplusplus
+
 #endif // _LIBS_UTILS_TIMERS_H
diff --git a/libutils/Timers.cpp b/libutils/Timers.cpp
index 5293cd2a..d4f85164 100644
--- a/libutils/Timers.cpp
+++ b/libutils/Timers.cpp
@@ -70,3 +70,65 @@ int toMillisecondTimeoutDelay(nsecs_t referenceTime, nsecs_t timeoutTime)
     }
     return timeoutDelayMillis;
 }
+
+
+/*
+ * ===========================================================================
+ *      DurationTimer
+ * ===========================================================================
+ */
+
+using namespace android;
+
+// Start the timer.
+void DurationTimer::start(void)
+{
+    gettimeofday(&mStartWhen, NULL);
+}
+
+// Stop the timer.
+void DurationTimer::stop(void)
+{
+    gettimeofday(&mStopWhen, NULL);
+}
+
+// Get the duration in microseconds.
+long long DurationTimer::durationUsecs(void) const
+{
+    return (long) subtractTimevals(&mStopWhen, &mStartWhen);
+}
+
+// Subtract two timevals.  Returns the difference (ptv1-ptv2) in
+// microseconds.
+/*static*/ long long DurationTimer::subtractTimevals(const struct timeval* ptv1,
+    const struct timeval* ptv2)
+{
+    long long stop  = ((long long) ptv1->tv_sec) * 1000000LL +
+                      ((long long) ptv1->tv_usec);
+    long long start = ((long long) ptv2->tv_sec) * 1000000LL +
+                      ((long long) ptv2->tv_usec);
+    return stop - start;
+}
+
+// Add the specified amount of time to the timeval.
+/*static*/ void DurationTimer::addToTimeval(struct timeval* ptv, long usec)
+{
+    if (usec < 0) {
+        ALOG(LOG_WARN, "", "Negative values not supported in addToTimeval\n");
+        return;
+    }
+
+    // normalize tv_usec if necessary
+    if (ptv->tv_usec >= 1000000) {
+        ptv->tv_sec += ptv->tv_usec / 1000000;
+        ptv->tv_usec %= 1000000;
+    }
+
+    ptv->tv_usec += usec % 1000000;
+    if (ptv->tv_usec >= 1000000) {
+        ptv->tv_usec -= 1000000;
+        ptv->tv_sec++;
+    }
+    ptv->tv_sec += usec / 1000000;
+}
+