зеркало из https://github.com/mozilla/gecko-dev.git
73 строки
2.1 KiB
C++
73 строки
2.1 KiB
C++
/* 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 mozilla_ipc_backgroundchild_h__
|
|
#define mozilla_ipc_backgroundchild_h__
|
|
|
|
#include "base/process.h"
|
|
#include "mozilla/Attributes.h"
|
|
#include "mozilla/ipc/Transport.h"
|
|
|
|
class nsIIPCBackgroundChildCreateCallback;
|
|
|
|
namespace mozilla {
|
|
namespace dom {
|
|
|
|
class ContentChild;
|
|
class ContentParent;
|
|
|
|
} // namespace dom
|
|
|
|
namespace ipc {
|
|
|
|
class PBackgroundChild;
|
|
|
|
// This class allows access to the PBackground protocol. PBackground allows
|
|
// communication between any thread (in the parent or a child process) and a
|
|
// single background thread in the parent process. Each PBackgroundChild
|
|
// instance is tied to the thread on which it is created and must not be shared
|
|
// across threads. Each PBackgroundChild is unique and valid as long as its
|
|
// designated thread lives.
|
|
//
|
|
// Creation of PBackground is asynchronous. GetForCurrentThread() will return
|
|
// null until the sequence is complete. GetOrCreateForCurrentThread() will start
|
|
// the creation sequence and will call back via the
|
|
// nsIIPCBackgroundChildCreateCallback interface when completed. Thereafter
|
|
// (assuming success) GetForCurrentThread() will return the same actor every
|
|
// time.
|
|
//
|
|
// The PBackgroundChild actor and all its sub-protocol actors will be
|
|
// automatically destroyed when its designated thread completes.
|
|
class BackgroundChild MOZ_FINAL
|
|
{
|
|
friend class mozilla::dom::ContentChild;
|
|
friend class mozilla::dom::ContentParent;
|
|
|
|
typedef base::ProcessId ProcessId;
|
|
typedef mozilla::ipc::Transport Transport;
|
|
|
|
public:
|
|
// See above.
|
|
static PBackgroundChild*
|
|
GetForCurrentThread();
|
|
|
|
// See above.
|
|
static bool
|
|
GetOrCreateForCurrentThread(nsIIPCBackgroundChildCreateCallback* aCallback);
|
|
|
|
private:
|
|
// Only called by ContentChild or ContentParent.
|
|
static void
|
|
Startup();
|
|
|
|
// Only called by ContentChild.
|
|
static PBackgroundChild*
|
|
Alloc(Transport* aTransport, ProcessId aOtherProcess);
|
|
};
|
|
|
|
} // namespace ipc
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_ipc_backgroundchild_h__
|