Merge "C2BqBuffer: resolve 3 way deadlock" am: e847865272 am: e50a2706f5
Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/2285818
Change-Id: I561f107a69a767f0885cdf7071531fca8b28adb5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/media/codec2/vndk/include/C2SurfaceSyncObj.h b/media/codec2/vndk/include/C2SurfaceSyncObj.h
index ac87fe4..d858f27 100644
--- a/media/codec2/vndk/include/C2SurfaceSyncObj.h
+++ b/media/codec2/vndk/include/C2SurfaceSyncObj.h
@@ -72,12 +72,13 @@
/**
* Notify a buffer is queued. Return whether the upcoming dequeue operation
* is not blocked. if it's blocked and waitId is non-null, waitId is returned
- * to be used for waiting.
+ * to be used for waiting. Notify(wake-up) waitors only when 'notify' is
+ * true.
*
* \retval false dequeue operation is blocked now.
* \retval true dequeue operation is possible.
*/
- bool notifyQueuedLocked(uint32_t *waitId = nullptr);
+ bool notifyQueuedLocked(uint32_t *waitId = nullptr, bool notify = true);
/**
* Notify a buffer is dequeued.
diff --git a/media/codec2/vndk/platform/C2BqBuffer.cpp b/media/codec2/vndk/platform/C2BqBuffer.cpp
index e67e42f..270bbf4 100644
--- a/media/codec2/vndk/platform/C2BqBuffer.cpp
+++ b/media/codec2/vndk/platform/C2BqBuffer.cpp
@@ -436,8 +436,8 @@
if (status == -ETIME) {
// fence is not signalled yet.
if (syncVar) {
- syncVar->lock();
(void)mProducer->cancelBuffer(slot, hFenceWrapper.getHandle()).isOk();
+ syncVar->lock();
dequeueable = syncVar->notifyQueuedLocked(&waitId);
syncVar->unlock();
if (c2Fence) {
@@ -452,8 +452,8 @@
if (status != android::NO_ERROR) {
ALOGD("buffer fence wait error %d", status);
if (syncVar) {
- syncVar->lock();
(void)mProducer->cancelBuffer(slot, hFenceWrapper.getHandle()).isOk();
+ syncVar->lock();
syncVar->notifyQueuedLocked();
syncVar->unlock();
if (c2Fence) {
@@ -502,8 +502,8 @@
} else if (status != android::NO_ERROR) {
slotBuffer.clear();
if (syncVar) {
- syncVar->lock();
(void)mProducer->cancelBuffer(slot, hFenceWrapper.getHandle()).isOk();
+ syncVar->lock();
syncVar->notifyQueuedLocked();
syncVar->unlock();
if (c2Fence) {
@@ -550,8 +550,8 @@
// Block was not created. call requestBuffer# again next time.
slotBuffer.clear();
if (syncVar) {
- syncVar->lock();
(void)mProducer->cancelBuffer(slot, hFenceWrapper.getHandle()).isOk();
+ syncVar->lock();
syncVar->notifyQueuedLocked();
syncVar->unlock();
if (c2Fence) {
@@ -813,11 +813,10 @@
if (mGeneration == mCurrentGeneration && mBqId == mCurrentBqId && !mOwner.expired()) {
C2SyncVariables *syncVar = mSyncMem ? mSyncMem->mem() : nullptr;
if (syncVar) {
+ mIgbp->cancelBuffer(mBqSlot, hidl_handle{}).isOk();
syncVar->lock();
- if (syncVar->getSyncStatusLocked() == C2SyncVariables::STATUS_ACTIVE) {
- mIgbp->cancelBuffer(mBqSlot, hidl_handle{}).isOk();
- syncVar->notifyQueuedLocked();
- }
+ syncVar->notifyQueuedLocked(nullptr,
+ syncVar->getSyncStatusLocked() == C2SyncVariables::STATUS_ACTIVE);
syncVar->unlock();
} else {
mIgbp->cancelBuffer(mBqSlot, hidl_handle{}).isOk();
@@ -826,11 +825,10 @@
} else if (!mOwner.expired()) {
C2SyncVariables *syncVar = mSyncMem ? mSyncMem->mem() : nullptr;
if (syncVar) {
+ mIgbp->cancelBuffer(mBqSlot, hidl_handle{}).isOk();
syncVar->lock();
- if (syncVar->getSyncStatusLocked() != C2SyncVariables::STATUS_SWITCHING) {
- mIgbp->cancelBuffer(mBqSlot, hidl_handle{}).isOk();
- syncVar->notifyQueuedLocked();
- }
+ syncVar->notifyQueuedLocked(nullptr,
+ syncVar->getSyncStatusLocked() != C2SyncVariables::STATUS_SWITCHING);
syncVar->unlock();
} else {
mIgbp->cancelBuffer(mBqSlot, hidl_handle{}).isOk();
diff --git a/media/codec2/vndk/platform/C2SurfaceSyncObj.cpp b/media/codec2/vndk/platform/C2SurfaceSyncObj.cpp
index 2115cc3..99bccac 100644
--- a/media/codec2/vndk/platform/C2SurfaceSyncObj.cpp
+++ b/media/codec2/vndk/platform/C2SurfaceSyncObj.cpp
@@ -177,12 +177,14 @@
return true;
}
-bool C2SyncVariables::notifyQueuedLocked(uint32_t *waitId) {
+bool C2SyncVariables::notifyQueuedLocked(uint32_t *waitId, bool notify) {
// Note. thundering herds may occur. Edge trigged signalling.
// But one waiter will guarantee to dequeue. others may wait again.
// Minimize futex syscall(trap) for the main use case(one waiter case).
if (mMaxDequeueCount == mCurDequeueCount--) {
- broadcast();
+ if (notify) {
+ broadcast();
+ }
return true;
}