Add elapsedRealtimeNano(), and use CLOCK_BOOTTIME where possible.
Change-Id: I4231c8ca32663e6e2cb5b7c126d091f837373807
diff --git a/include/utils/SystemClock.h b/include/utils/SystemClock.h
index 7c319be..d75264c 100644
--- a/include/utils/SystemClock.h
+++ b/include/utils/SystemClock.h
@@ -25,6 +25,7 @@
int setCurrentTimeMillis(int64_t millis);
int64_t uptimeMillis();
int64_t elapsedRealtime();
+int64_t elapsedRealtimeNano();
}; // namespace android
diff --git a/include/utils/Timers.h b/include/utils/Timers.h
index 8b4d322..92f66c9 100644
--- a/include/utils/Timers.h
+++ b/include/utils/Timers.h
@@ -78,9 +78,10 @@
SYSTEM_TIME_REALTIME = 0, // system-wide realtime clock
SYSTEM_TIME_MONOTONIC = 1, // monotonic time since unspecified starting point
SYSTEM_TIME_PROCESS = 2, // high-resolution per-process clock
- SYSTEM_TIME_THREAD = 3 // high-resolution per-thread clock
+ SYSTEM_TIME_THREAD = 3, // high-resolution per-thread clock
+ SYSTEM_TIME_BOOTTIME = 4 // same as SYSTEM_TIME_MONOTONIC, but including CPU suspend time
};
-
+
// return the system-time according to the specified clock
#ifdef __cplusplus
nsecs_t systemTime(int clock = SYSTEM_TIME_MONOTONIC);
diff --git a/libs/utils/SystemClock.cpp b/libs/utils/SystemClock.cpp
index 8b8ac10..53e0626 100644
--- a/libs/utils/SystemClock.cpp
+++ b/libs/utils/SystemClock.cpp
@@ -106,7 +106,22 @@
*/
int64_t elapsedRealtime()
{
+ return nanoseconds_to_milliseconds(elapsedRealtimeNano());
+}
+
+/*
+ * native public static long elapsedRealtimeNano();
+ */
+int64_t elapsedRealtimeNano()
+{
#ifdef HAVE_ANDROID_OS
+ struct timespec ts;
+ int result = clock_gettime(CLOCK_BOOTTIME, &ts);
+ if (result == 0) {
+ return seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec;
+ }
+
+ // CLOCK_BOOTTIME doesn't exist, fallback to /dev/alarm
static int s_fd = -1;
if (s_fd == -1) {
@@ -114,25 +129,20 @@
if (android_atomic_cmpxchg(-1, fd, &s_fd)) {
close(fd);
}
+ result = ioctl(s_fd,
+ ANDROID_ALARM_GET_TIME(ANDROID_ALARM_ELAPSED_REALTIME), &ts);
}
- struct timespec ts;
- int result = ioctl(s_fd,
- ANDROID_ALARM_GET_TIME(ANDROID_ALARM_ELAPSED_REALTIME), &ts);
-
if (result == 0) {
- int64_t when = seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec;
- return (int64_t) nanoseconds_to_milliseconds(when);
- } else {
- // XXX: there was an error, probably because the driver didn't
- // exist ... this should return
- // a real error, like an exception!
- int64_t when = systemTime(SYSTEM_TIME_MONOTONIC);
- return (int64_t) nanoseconds_to_milliseconds(when);
+ return seconds_to_nanoseconds(ts.tv_sec) + ts.tv_nsec;
}
+
+ // XXX: there was an error, probably because the driver didn't
+ // exist ... this should return
+ // a real error, like an exception!
+ return systemTime(SYSTEM_TIME_MONOTONIC);
#else
- int64_t when = systemTime(SYSTEM_TIME_MONOTONIC);
- return (int64_t) nanoseconds_to_milliseconds(when);
+ return systemTime(SYSTEM_TIME_MONOTONIC);
#endif
}
diff --git a/libs/utils/Timers.cpp b/libs/utils/Timers.cpp
index 64b4701..d4f8516 100644
--- a/libs/utils/Timers.cpp
+++ b/libs/utils/Timers.cpp
@@ -39,7 +39,8 @@
CLOCK_REALTIME,
CLOCK_MONOTONIC,
CLOCK_PROCESS_CPUTIME_ID,
- CLOCK_THREAD_CPUTIME_ID
+ CLOCK_THREAD_CPUTIME_ID,
+ CLOCK_BOOTTIME
};
struct timespec t;
t.tv_sec = t.tv_nsec = 0;