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graphics: discard stale data from message queue

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Our use of message queues is synchronous.  If there are already data
in the queue when writeQueue is called, we know they are stale and
can be discarded.

Bug: 65449888
Test: manual
Change-Id: Ie29b8a7386c9733c183a6c3569e3572efa62cbc2
This commit is contained in:
Chia-I Wu
2017-09-08 11:24:32 -07:00
parent a24f85f9b9
commit 48ffe289b0
1 changed files with 17 additions and 0 deletions
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17
graphics/composer/2.1/default/IComposerCommandBuffer.h
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@@ -92,6 +92,23 @@ public:
bool writeQueue(bool* outQueueChanged, uint32_t* outCommandLength,
hidl_vec<hidl_handle>* outCommandHandles)
{
// After data are written to the queue, it may not be read by the
// remote reader when
//
// - the writer does not send them (because of other errors)
// - the hwbinder transaction fails
// - the reader does not read them (because of other errors)
//
// Discard the stale data here.
size_t staleDataSize = mQueue ? mQueue->availableToRead() : 0;
if (staleDataSize > 0) {
ALOGW("discarding stale data from message queue");
CommandQueueType::MemTransaction tx;
if (mQueue->beginRead(staleDataSize, &tx)) {
mQueue->commitRead(staleDataSize);
}
}
// write data to queue, optionally resizing it
if (mQueue && (mDataMaxSize <= mQueue->getQuantumCount())) {
if (!mQueue->write(mData.get(), mDataWritten)) {