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-rw-r--r--dom/media/gmp/GMPServiceChild.h164
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diff --git a/dom/media/gmp/GMPServiceChild.h b/dom/media/gmp/GMPServiceChild.h
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+++ b/dom/media/gmp/GMPServiceChild.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GMPServiceChild_h_
+#define GMPServiceChild_h_
+
+#include "GMPService.h"
+#include "MediaResult.h"
+#include "base/process.h"
+#include "mozilla/dom/PContent.h"
+#include "mozilla/gmp/PGMPServiceChild.h"
+#include "mozilla/MozPromise.h"
+#include "nsIAsyncShutdown.h"
+#include "nsRefPtrHashtable.h"
+
+namespace mozilla::gmp {
+
+class GMPContentParent;
+class GMPServiceChild;
+
+class GeckoMediaPluginServiceChild : public GeckoMediaPluginService,
+ public nsIAsyncShutdownBlocker {
+ friend class GMPServiceChild;
+
+ public:
+ static already_AddRefed<GeckoMediaPluginServiceChild> GetSingleton();
+ nsresult Init() override;
+
+ NS_DECL_ISUPPORTS_INHERITED
+ NS_DECL_NSIASYNCSHUTDOWNBLOCKER
+
+ NS_IMETHOD HasPluginForAPI(const nsACString& aAPI,
+ const nsTArray<nsCString>& aTags,
+ bool* aRetVal) override;
+ NS_IMETHOD GetNodeId(const nsAString& aOrigin,
+ const nsAString& aTopLevelOrigin,
+ const nsAString& aGMPName,
+ UniquePtr<GetNodeIdCallback>&& aCallback) override;
+
+ NS_DECL_NSIOBSERVER
+
+ void SetServiceChild(RefPtr<GMPServiceChild>&& aServiceChild);
+
+ void RemoveGMPContentParent(GMPContentParent* aGMPContentParent);
+
+ static void UpdateGMPCapabilities(
+ nsTArray<mozilla::dom::GMPCapabilityData>&& aCapabilities);
+
+ void BeginShutdown();
+
+ protected:
+ void InitializePlugins(nsISerialEventTarget*) override {
+ // Nothing to do here.
+ }
+
+ RefPtr<GetGMPContentParentPromise> GetContentParent(
+ GMPCrashHelper* aHelper, const NodeIdVariant& aNodeIdVariant,
+ const nsACString& aAPI, const nsTArray<nsCString>& aTags) override;
+
+ private:
+ friend class OpenPGMPServiceChild;
+
+ ~GeckoMediaPluginServiceChild() override;
+
+ typedef MozPromise<GMPServiceChild*, MediaResult, /* IsExclusive = */ true>
+ GetServiceChildPromise;
+ RefPtr<GetServiceChildPromise> GetServiceChild();
+
+ nsTArray<MozPromiseHolder<GetServiceChildPromise>> mGetServiceChildPromises;
+ RefPtr<GMPServiceChild> mServiceChild;
+
+ // Shutdown blocker management. A shutdown blocker is used to ensure that
+ // we do not shutdown until all content parents are removed from
+ // GMPServiceChild::mContentParents.
+ //
+ // The following rules let us shutdown block (and thus we shouldn't
+ // violate them):
+ // - We will only call GetContentParent if mShuttingDownOnGMPThread is false.
+ // - mShuttingDownOnGMPThread will become true once profile teardown is
+ // observed in the parent process (and once GMPServiceChild receives a
+ // message from GMPServiceParent) or if we block shutdown (which implies
+ // we're in shutdown).
+ // - If we currently have mPendingGetContentParents > 0 or parents in
+ // GMPServiceChild::mContentParents we should block shutdown so such
+ // parents can be cleanly shutdown.
+ // therefore
+ // - We can block shutdown at xpcom-will-shutdown until our content parents
+ // are handled.
+ // - Because once mShuttingDownOnGMPThread is true we cannot add new content
+ // parents, we know that when mShuttingDownOnGMPThread && all content
+ // parents are handled we'll never add more and it's safe to stop blocking
+ // shutdown.
+ // this relies on
+ // - Once we're shutting down, we need to ensure all content parents are
+ // shutdown and removed. Failure to do so will result in a shutdown stall.
+
+ // Note that at the time of writing there are significant differences in how
+ // xpcom shutdown is handled in release and non-release builds. For example,
+ // in release builds content processes are exited early, so xpcom shutdown
+ // is not observed (and not blocked by blockers). This is important to keep
+ // in mind when testing the shutdown blocking machinery (you won't see most
+ // of it be invoked in release).
+
+ // All of these members should only be used on the GMP thread unless
+ // otherwise noted!
+
+ // Add a shutdown blocker. Main thread only. Should only be called once when
+ // we init the service.
+ nsresult AddShutdownBlocker();
+ // Remove a shutdown blocker. Should be called once at most and only when
+ // mShuttingDownOnGMPThread. Prefer RemoveShutdownBlockerIfNeeded unless
+ // absolutely certain you need to call this directly.
+ void RemoveShutdownBlocker();
+ // Remove shutdown blocker if the following conditions are met:
+ // - mShuttingDownOnGMPThread.
+ // - !mServiceChild->HaveContentParents.
+ // - mPendingGetContentParents == 0.
+ // - mShutdownBlockerHasBeenAdded.
+ void RemoveShutdownBlockerIfNeeded();
+
+#ifdef DEBUG
+ // Track if we've added a shutdown blocker for sanity checking. Main thread
+ // only.
+ bool mShutdownBlockerAdded = false;
+#endif // DEBUG
+ // The number of GetContentParent calls that have not yet been resolved or
+ // rejected. We use this value to help determine if we need to block
+ // shutdown. Should only be used on GMP thread to avoid races.
+ uint32_t mPendingGetContentParents = 0;
+ // End shutdown blocker management.
+};
+
+class GMPServiceChild : public PGMPServiceChild {
+ public:
+ // Mark AddRef and Release as `final`, as they overload pure virtual
+ // implementations in PGMPServiceChild.
+ NS_INLINE_DECL_THREADSAFE_REFCOUNTING(GMPServiceChild, final)
+
+ explicit GMPServiceChild() = default;
+
+ already_AddRefed<GMPContentParent> GetBridgedGMPContentParent(
+ ProcessId aOtherPid, ipc::Endpoint<PGMPContentParent>&& endpoint);
+
+ void RemoveGMPContentParent(GMPContentParent* aGMPContentParent);
+
+ void GetAlreadyBridgedTo(nsTArray<ProcessId>& aAlreadyBridgedTo);
+
+ static bool Create(Endpoint<PGMPServiceChild>&& aGMPService);
+
+ ipc::IPCResult RecvBeginShutdown() override;
+
+ bool HaveContentParents() const;
+
+ private:
+ ~GMPServiceChild() = default;
+
+ nsRefPtrHashtable<nsUint64HashKey, GMPContentParent> mContentParents;
+};
+
+} // namespace mozilla::gmp
+
+#endif // GMPServiceChild_h_