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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_PROCESS_SINGLETON_H_
#define CHROME_BROWSER_PROCESS_SINGLETON_H_
#include <string>
#include <windows.h>
#include "base/basictypes.h"
#include "base/file_path.h"
// ProcessSingleton ----------------------------------------------------------
//
// This class allows different browser processes to communicate with
// each other. It is named according to the user data directory, so
// we can be sure that no more than one copy of the application can be
// running at once with a given data directory.
//
// The Windows implementation uses an invisible global message window for
// IPC.
class ProcessSingleton {
public:
explicit ProcessSingleton(const FilePath& user_data_dir);
~ProcessSingleton();
// Returns true if another process was found and notified, false if we
// should continue with this process. Roughly based on Mozilla
//
// TODO(brettw): this will not handle all cases. If two process start up too
// close to each other, the window might not have been created yet for the
// first one, so this function won't find it.
bool NotifyOtherProcess();
// Create the toplevel message window for IPC.
void Create();
// Blocks the dispatch of CopyData messages.
void Lock() {
locked_ = true;
}
// Allows the dispatch of CopyData messages.
void Unlock() {
locked_ = false;
}
// This ugly behemoth handles startup commands sent from another process.
LRESULT OnCopyData(HWND hwnd, const COPYDATASTRUCT* cds);
// Looks for zombie renderer and plugin processes that could have survived.
void HuntForZombieChromeProcesses();
private:
LRESULT CALLBACK WndProc(HWND hwnd,
UINT message,
WPARAM wparam,
LPARAM lparam);
static LRESULT CALLBACK WndProcStatic(HWND hwnd,
UINT message,
WPARAM wparam,
LPARAM lparam) {
ProcessSingleton* msg_wnd = reinterpret_cast<ProcessSingleton*>(
GetWindowLongPtr(hwnd, GWLP_USERDATA));
return msg_wnd->WndProc(hwnd, message, wparam, lparam);
}
HWND remote_window_; // The HWND_MESSAGE of another browser.
HWND window_; // The HWND_MESSAGE window.
bool locked_;
DISALLOW_COPY_AND_ASSIGN(ProcessSingleton);
};
#endif // #ifndef CHROME_BROWSER_PROCESS_SINGLETON_H_
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