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Bug 1426129 - Hold CamerasChild via promoting "this" to a RefPtr. r=pehrsons, a=RyanVM

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This commit is contained in:
Paul Adenot 2018-04-16 10:51:48 +02:00 • committed by Roy Tam
commit 8e5fec311a
2 changed files with 23 additions and 3 deletions
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15
dom/media/systemservices/CamerasChild.cpp
View file

@ -35,7 +35,9 @@ CamerasSingleton::CamerasSingleton()
: mCamerasMutex("CamerasSingleton::mCamerasMutex"),
mCameras(nullptr),
mCamerasChildThread(nullptr),
mFakeDeviceChangeEventThread(nullptr) {
mFakeDeviceChangeEventThread(nullptr),
mInShutdown(false)
{
LOG(("CamerasSingleton: %p", this));
}
@ -285,6 +287,7 @@ CamerasChild::NumberOfCapabilities(CaptureEngine aCapEngine,
LOG((__PRETTY_FUNCTION__));
LOG(("NumberOfCapabilities for %s", deviceUniqueIdUTF8));
nsCString unique_id(deviceUniqueIdUTF8);
RefPtr<CamerasChild> deathGrip = this;
nsCOMPtr<nsIRunnable> runnable =
mozilla::NewNonOwningRunnableMethod<CaptureEngine, nsCString>
(this, &CamerasChild::SendNumberOfCapabilities, aCapEngine, unique_id);
@ -321,6 +324,7 @@ int
CamerasChild::EnsureInitialized(CaptureEngine aCapEngine)
{
LOG((__PRETTY_FUNCTION__));
RefPtr<CamerasChild> deathGrip = this;
nsCOMPtr<nsIRunnable> runnable =
mozilla::NewNonOwningRunnableMethod<CaptureEngine>
(this, &CamerasChild::SendEnsureInitialized, aCapEngine);
@ -336,6 +340,7 @@ CamerasChild::GetCaptureCapability(CaptureEngine aCapEngine,
webrtc::CaptureCapability& capability)
{
LOG(("GetCaptureCapability: %s %d", unique_idUTF8, capability_number));
RefPtr<CamerasChild> deathGrip = this;
nsCString unique_id(unique_idUTF8);
nsCOMPtr<nsIRunnable> runnable =
mozilla::NewNonOwningRunnableMethod<CaptureEngine, nsCString, unsigned int>
@ -374,6 +379,7 @@ CamerasChild::GetCaptureDevice(CaptureEngine aCapEngine,
bool* scary)
{
LOG((__PRETTY_FUNCTION__));
RefPtr<CamerasChild> deathGrip = this;
nsCOMPtr<nsIRunnable> runnable =
mozilla::NewNonOwningRunnableMethod<CaptureEngine, unsigned int>
(this, &CamerasChild::SendGetCaptureDevice, aCapEngine, list_number);
@ -413,6 +419,7 @@ CamerasChild::AllocateCaptureDevice(CaptureEngine aCapEngine,
const nsACString& aOrigin)
{
LOG((__PRETTY_FUNCTION__));
RefPtr<CamerasChild> deathGrip = this;
nsCString unique_id(unique_idUTF8);
nsCString origin(aOrigin);
nsCOMPtr<nsIRunnable> runnable =
@ -444,6 +451,7 @@ CamerasChild::ReleaseCaptureDevice(CaptureEngine aCapEngine,
const int capture_id)
{
LOG((__PRETTY_FUNCTION__));
RefPtr<CamerasChild> deathGrip = this;
nsCOMPtr<nsIRunnable> runnable =
mozilla::NewNonOwningRunnableMethod<CaptureEngine, int>
(this, &CamerasChild::SendReleaseCaptureDevice, aCapEngine, capture_id);
@ -491,6 +499,7 @@ CamerasChild::StartCapture(CaptureEngine aCapEngine,
webrtcCaps.rawType,
webrtcCaps.codecType,
webrtcCaps.interlaced);
RefPtr<CamerasChild> deathGrip = this;
nsCOMPtr<nsIRunnable> runnable =
mozilla::NewNonOwningRunnableMethod<CaptureEngine, int, CaptureCapability>
(this, &CamerasChild::SendStartCapture, aCapEngine, capture_id, capCap);
@ -502,6 +511,7 @@ int
CamerasChild::StopCapture(CaptureEngine aCapEngine, const int capture_id)
{
LOG((__PRETTY_FUNCTION__));
RefPtr<CamerasChild> deathGrip = this;
nsCOMPtr<nsIRunnable> runnable =
mozilla::NewNonOwningRunnableMethod<CaptureEngine, int>
(this, &CamerasChild::SendStopCapture, aCapEngine, capture_id);
@ -567,6 +577,7 @@ CamerasChild::ShutdownParent()
// Delete the parent actor.
// CamerasChild (this) will remain alive and is only deleted by the
// IPC layer when SendAllDone returns.
RefPtr<CamerasChild> deathGrip = this;
nsCOMPtr<nsIRunnable> deleteRunnable =
mozilla::NewNonOwningRunnableMethod(this, &CamerasChild::SendAllDone);
CamerasSingleton::Thread()->Dispatch(deleteRunnable, NS_DISPATCH_NORMAL);
@ -695,7 +706,7 @@ CamerasChild::~CamerasChild()
{
LOG(("~CamerasChild: %p", this));
{
if (!CamerasSingleton::InShutdown()) {
OffTheBooksMutexAutoLock lock(CamerasSingleton::Mutex());
// In normal circumstances we've already shut down and the
// following does nothing. But on fatal IPC errors we will

11
dom/media/systemservices/CamerasChild.h
View file

@ -89,6 +89,14 @@ public:
return gTheInstance.get()->mFakeDeviceChangeEventThread;
}
static bool InShutdown() {
return gTheInstance.get()->mInShutdown;
}
static void StartShutdown() {
gTheInstance.get()->mInShutdown = true;
}
private:
static Singleton<CamerasSingleton> gTheInstance;
@ -106,6 +114,7 @@ private:
CamerasChild* mCameras;
nsCOMPtr<nsIThread> mCamerasChildThread;
nsCOMPtr<nsIThread> mFakeDeviceChangeEventThread;
Atomic<bool> mInShutdown;
};
// Get a pointer to a CamerasChild object we can use to do IPC with.
@ -145,7 +154,7 @@ class CamerasChild final : public PCamerasChild
public:
// We are owned by the PBackground thread only. CamerasSingleton
// takes a non-owning reference.
NS_INLINE_DECL_REFCOUNTING(CamerasChild)
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(CamerasChild)
// IPC messages recevied, received on the PBackground thread
// these are the actual callbacks with data