forked from mirrors/gecko-dev
77 lines
2.8 KiB
C++
77 lines
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_PreallocatedProcessManager_h
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#define mozilla_PreallocatedProcessManager_h
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#include "base/basictypes.h"
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#include "mozilla/AlreadyAddRefed.h"
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#include "nsStringFwd.h"
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namespace mozilla {
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namespace dom {
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class ContentParent;
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} // namespace dom
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/**
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* This class manages a ContentParent that it starts up ahead of any particular
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* need. You can then call Take() to get this process and use it. Since we
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* already started it up, it should be ready for use faster than if you'd
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* created the process when you needed it.
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*
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* This class watches the dom.ipc.processPrelaunch.enabled pref. If it changes
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* from false to true, it preallocates a process. If it changes from true to
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* false, it kills the preallocated process, if any.
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*
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* We don't expect this pref to flip between true and false in production, but
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* flipping the pref is important for tests.
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*/
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class PreallocatedProcessManagerImpl;
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class PreallocatedProcessManager final {
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typedef mozilla::dom::ContentParent ContentParent;
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public:
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static PreallocatedProcessManagerImpl* GetPPMImpl();
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/**
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* Before first paint we don't want to allocate any processes in the
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* background. To avoid that, the PreallocatedProcessManager won't start up
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* any processes while there is a blocker active.
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*/
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static void AddBlocker(const nsACString& aRemoteType, ContentParent* aParent);
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static void RemoveBlocker(const nsACString& aRemoteType,
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ContentParent* aParent);
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/**
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* Take the preallocated process, if we have one, or a recycled
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* process cached via Provide(). Currently we only cache
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* DEFAULT_REMOTE_TYPE ('web') processes and only reuse them for that
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* type. If we don't have a process to return (cached or preallocated),
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* this returns null.
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*
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* If we use a preallocated process, it will schedule the start of
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* another on Idle (AllocateOnIdle()).
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*/
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static already_AddRefed<ContentParent> Take(const nsACString& aRemoteType);
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/**
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* Cache a process (currently only DEFAULT_REMOTE_TYPE) for reuse later
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* via Take(). Returns true if we cached the process, and false if
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* another process is already cached (so the caller knows to destroy it).
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* This takes a reference to the ContentParent if it is cached.
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*/
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static bool Provide(ContentParent* aParent);
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static void Erase(ContentParent* aParent);
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private:
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PreallocatedProcessManager();
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DISALLOW_EVIL_CONSTRUCTORS(PreallocatedProcessManager);
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};
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} // namespace mozilla
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#endif // defined mozilla_PreallocatedProcessManager_h
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