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#491: new fix for M1452416

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This commit is contained in:
Cameron Kaiser 2018-04-26 21:44:21 -07:00
parent 2bc560a930
commit 8ebe4e8e55
1 changed files with 26 additions and 0 deletions
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26
dom/media/MediaStreamGraph.cpp
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@ -57,6 +57,26 @@ LazyLogModule gMediaStreamGraphLog("MediaStreamGraph");
# define LIFECYCLE_LOG(...)
#endif
// Fix for bug 1452416, since we don't have the proper form of
// NS_ReleaseOnMainThread(). This is based on our fix for M1348955
// et al. as demonstrated in TenFourFox issue 478.
template<typename T>
class ProxyReleaseEvent : public nsRunnable
{
public:
explicit ProxyReleaseEvent(already_AddRefed<T> aDoomed)
: mDoomed(aDoomed.take()) {}
NS_IMETHOD Run() override
{
NS_IF_RELEASE(mDoomed);
return NS_OK;
}
private:
T* MOZ_OWNING_REF mDoomed;
};
/**
* A hash table containing the graph instances, one per AudioChannel.
*/
@ -1497,6 +1517,12 @@ MediaStreamGraphImpl::RunInStableState(bool aSourceIsMSG)
RefPtr<GraphDriver> driver = CurrentDriver();
MonitorAutoUnlock unlock(mMonitor);
driver->Start();
// It's not safe to Shutdown() a thread from StableState, and
// releasing this may shutdown a SystemClockDriver thread.
// Proxy the release to outside of StableState.
// NS_ReleaseOnMainThread(driver.forget(), true); // always proxy
nsCOMPtr<nsIRunnable> event = new ProxyReleaseEvent<GraphDriver>(driver.forget());
NS_DispatchToMainThread(event.forget());
}
}