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core/command_queue_mt: Fix crash/hang when buffer fills up

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This patch fixes two related issues. One is the race condition in issue #42107..
The other is a crash which happens when the reader is lapped near the end of the buffer.
This commit is contained in:
Lyuma 2020-09-24 09:55:38 -07:00
parent 48e8da4aac
commit 9f654b441f
2 changed files with 21 additions and 7 deletions
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2
core/command_queue_mt.cpp
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@ -72,7 +72,7 @@ CommandQueueMT::SyncSemaphore *CommandQueueMT::_alloc_sync_sem() {
bool CommandQueueMT::dealloc_one() {
tryagain:
if (dealloc_ptr == write_ptr) {
if (dealloc_ptr == (write_ptr_and_epoch >> 1)) {
// The queue is empty
return false;
}