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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 "build/build_config.h"
#if defined(OS_WIN)
#include <windows.h>
#endif
#include "base/basictypes.h"
#include "base/file_path.h"
#include "base/gfx/native_widget_types.h"
#include "base/logging.h"
#include "base/non_thread_safe.h"
#include "base/ref_counted.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.
//
// Implementation notes:
// - the Windows implementation uses an invisible global message window;
// - the Linux implementation uses a Unix domain socket in the user data dir.
class ProcessSingleton : public NonThreadSafe {
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.
// Windows code roughly based on Mozilla.
//
// TODO(brettw): this will not handle all cases. If two process start up too
// close to each other, the Create() might not yet have happened for the
// first one, so this function won't find it.
bool NotifyOtherProcess();
// Sets ourself up as the singleton instance.
void Create();
// Blocks the dispatch of CopyData messages. foreground_window refers
// to the window that should be set to the foreground if a CopyData message
// is received while the ProcessSingleton is locked.
void Lock(gfx::NativeWindow foreground_window) {
DCHECK(CalledOnValidThread());
locked_ = true;
foreground_window_ = foreground_window;
}
// Allows the dispatch of CopyData messages.
void Unlock() {
DCHECK(CalledOnValidThread());
locked_ = false;
foreground_window_ = NULL;
}
bool locked() {
DCHECK(CalledOnValidThread());
return locked_;
}
private:
bool locked_;
gfx::NativeWindow foreground_window_;
#if defined(OS_WIN)
// This ugly behemoth handles startup commands sent from another process.
LRESULT OnCopyData(HWND hwnd, const COPYDATASTRUCT* cds);
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.
#elif defined(OS_LINUX)
// Set up a socket and sockaddr appropriate for messaging.
void SetupSocket(int* sock, struct sockaddr_un* addr);
// Path in file system to the socket.
FilePath socket_path_;
// Helper class for linux specific messages. LinuxWatcher is ref counted
// because it posts messages between threads.
class LinuxWatcher;
scoped_refptr<LinuxWatcher> watcher_;
#endif
DISALLOW_COPY_AND_ASSIGN(ProcessSingleton);
};
#endif // CHROME_BROWSER_PROCESS_SINGLETON_H_
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