Add Fence helpers: Time, Timeline, Snapshot
FenceTime will be used to:
1) Cache and share the result of a Fence's getSignalTime with
all clients that care about it, instead of requiring a
syscall for each client.
2) Allow tests to override the valid state and signalTimes of
the underlying fence by acting as a shim.
FenceTimeline will be used to efficiently get the signal
times of Fences without having query for Fences that
likely haven't signaled.
FenceTime::Snapshot is a stable copy of a FenceTime that
can be used for serialization since it doesn't change
while flattening.
Test: adb shell /data/nativetest/libgui_test/libgui_test
--gtest_filter=*GetFrameTimestamps*
Change-Id: I9a28df7ce797311dc4d56b1147edf590e9de1517
diff --git a/include/ui/Fence.h b/include/ui/Fence.h
index 1df15f8..99b39d8 100644
--- a/include/ui/Fence.h
+++ b/include/ui/Fence.h
@@ -42,6 +42,11 @@
{
public:
static const sp<Fence> NO_FENCE;
+ static constexpr nsecs_t SIGNAL_TIME_PENDING = INT64_MAX;
+ static constexpr nsecs_t SIGNAL_TIME_INVALID = -1;
+ static inline bool isValidTimestamp(nsecs_t time) {
+ return time >= 0 && time < INT64_MAX;
+ }
// TIMEOUT_NEVER may be passed to the wait method to indicate that it
// should wait indefinitely for the fence to signal.
@@ -94,8 +99,8 @@
// getSignalTime returns the system monotonic clock time at which the
// fence transitioned to the signaled state. If the fence is not signaled
- // then INT64_MAX is returned. If the fence is invalid or if an error
- // occurs then -1 is returned.
+ // then SIGNAL_TIME_PENDING is returned. If the fence is invalid or if an
+ // error occurs then SIGNAL_TIME_INVALID is returned.
nsecs_t getSignalTime() const;
#if __cplusplus > 201103L