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1 // Copyright (c) 2009 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2009 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "chrome/browser/process_singleton.h" | 5 #include "chrome/browser/process_singleton.h" |
6 | 6 |
7 #include "app/l10n_util.h" | 7 #include "app/l10n_util.h" |
8 #include "app/win_util.h" | 8 #include "app/win_util.h" |
9 #include "base/base_paths.h" | 9 #include "base/base_paths.h" |
10 #include "base/command_line.h" | 10 #include "base/command_line.h" |
11 #include "base/path_service.h" | 11 #include "base/path_service.h" |
12 #include "base/process_util.h" | 12 #include "base/process_util.h" |
13 #include "base/scoped_handle.h" | |
13 #include "base/win_util.h" | 14 #include "base/win_util.h" |
14 #include "chrome/browser/browser_init.h" | 15 #include "chrome/browser/browser_init.h" |
15 #include "chrome/browser/browser_process.h" | 16 #include "chrome/browser/browser_process.h" |
16 #include "chrome/browser/profile.h" | 17 #include "chrome/browser/profile.h" |
17 #include "chrome/browser/profile_manager.h" | 18 #include "chrome/browser/profile_manager.h" |
18 #include "chrome/common/chrome_constants.h" | 19 #include "chrome/common/chrome_constants.h" |
19 #include "chrome/common/chrome_paths.h" | 20 #include "chrome/common/chrome_paths.h" |
20 #include "chrome/common/result_codes.h" | 21 #include "chrome/common/result_codes.h" |
22 #include "chrome/installer/util/browser_distribution.h" | |
21 #include "grit/chromium_strings.h" | 23 #include "grit/chromium_strings.h" |
22 #include "grit/generated_resources.h" | 24 #include "grit/generated_resources.h" |
23 | 25 |
24 namespace { | 26 namespace { |
25 | 27 |
26 // Checks the visibility of the enumerated window and signals once a visible | 28 // Checks the visibility of the enumerated window and signals once a visible |
27 // window has been found. | 29 // window has been found. |
28 BOOL CALLBACK BrowserWindowEnumeration(HWND window, LPARAM param) { | 30 BOOL CALLBACK BrowserWindowEnumeration(HWND window, LPARAM param) { |
29 bool* result = reinterpret_cast<bool*>(param); | 31 bool* result = reinterpret_cast<bool*>(param); |
30 *result = IsWindowVisible(window) != 0; | 32 *result = IsWindowVisible(window) != 0; |
31 // Stops enumeration if a visible window has been found. | 33 // Stops enumeration if a visible window has been found. |
32 return !*result; | 34 return !*result; |
33 } | 35 } |
34 | 36 |
35 } // namespace | 37 } // namespace |
36 | 38 |
37 // Look for a Chrome instance that uses the same profile directory. | 39 // Look for a Chrome instance that uses the same profile directory. |
38 ProcessSingleton::ProcessSingleton(const FilePath& user_data_dir) | 40 ProcessSingleton::ProcessSingleton(const FilePath& user_data_dir) |
39 : window_(NULL), locked_(false), foreground_window_(NULL) { | 41 : window_(NULL), locked_(false), foreground_window_(NULL) { |
40 // FindWindoEx and Create() should be one atomic operation in order to not | 42 std::wstring user_data_dir_str(user_data_dir.ToWStringHack()); |
41 // have a race condition. | 43 remote_window_ = FindWindowEx(HWND_MESSAGE, NULL, |
42 remote_window_ = FindWindowEx(HWND_MESSAGE, NULL, chrome::kMessageWindowClass, | 44 chrome::kMessageWindowClass, |
43 user_data_dir.ToWStringHack().c_str()); | 45 user_data_dir_str.c_str()); |
44 if (!remote_window_) | 46 if (!remote_window_) { |
45 Create(); | 47 // Make sure we will be the one and only process creating the window. |
48 // We use a named Mutex since we are protecting against multi-process | |
49 // access. As documented, it's clearer to NOT request ownership on creation | |
50 // since it isn't guaranteed we will get it. It is better to create it | |
51 // without ownership and explicitly get the ownership afterward. | |
52 std::wstring mutex_name(L"Local\\ProcessSingletonStartup!"); | |
53 mutex_name += BrowserDistribution::GetDistribution()->GetAppGuid(); | |
54 ScopedHandle only_me(CreateMutex(NULL, FALSE, mutex_name.c_str())); | |
55 DCHECK(only_me.Get() != NULL) << "GetLastError = " << GetLastError(); | |
56 | |
57 // This is how we acquire the mutex (as opposed to the initial ownership). | |
58 DWORD result = WaitForSingleObject(only_me, INFINITE); | |
Sigurður Ásgeirsson
2012/04/11 12:17:40
WFSO can also return WAIT_ABANDONED for success. T
| |
59 DCHECK(result == WAIT_OBJECT_0) << "Result = " << result << | |
60 "GetLastError = " << GetLastError(); | |
61 | |
62 // We now own the mutex so we are the only process that can create the | |
63 // window at this time, but we must still check if someone created it | |
64 // between the time where we looked for it above and the time the mutex | |
65 // was given to us. | |
66 remote_window_ = FindWindowEx(HWND_MESSAGE, NULL, | |
67 chrome::kMessageWindowClass, | |
68 user_data_dir_str.c_str()); | |
69 if (!remote_window_) | |
70 Create(); | |
71 BOOL success = ReleaseMutex(only_me); | |
72 DCHECK(success) << "GetLastError = " << GetLastError(); | |
73 } | |
46 } | 74 } |
47 | 75 |
48 ProcessSingleton::~ProcessSingleton() { | 76 ProcessSingleton::~ProcessSingleton() { |
49 if (window_) { | 77 if (window_) { |
50 DestroyWindow(window_); | 78 DestroyWindow(window_); |
51 UnregisterClass(chrome::kMessageWindowClass, GetModuleHandle(NULL)); | 79 UnregisterClass(chrome::kMessageWindowClass, GetModuleHandle(NULL)); |
52 } | 80 } |
53 } | 81 } |
54 | 82 |
55 ProcessSingleton::NotifyResult ProcessSingleton::NotifyOtherProcess() { | 83 ProcessSingleton::NotifyResult ProcessSingleton::NotifyOtherProcess() { |
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261 switch (message) { | 289 switch (message) { |
262 case WM_COPYDATA: | 290 case WM_COPYDATA: |
263 return OnCopyData(reinterpret_cast<HWND>(wparam), | 291 return OnCopyData(reinterpret_cast<HWND>(wparam), |
264 reinterpret_cast<COPYDATASTRUCT*>(lparam)); | 292 reinterpret_cast<COPYDATASTRUCT*>(lparam)); |
265 default: | 293 default: |
266 break; | 294 break; |
267 } | 295 } |
268 | 296 |
269 return ::DefWindowProc(hwnd, message, wparam, lparam); | 297 return ::DefWindowProc(hwnd, message, wparam, lparam); |
270 } | 298 } |
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