The Tor Browser / file comparison
comparison: ipc/chromium/src/chrome/common/child_process.h
ipc/chromium/src/chrome/common/child_process.h
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| 1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef CHROME_COMMON_CHILD_PROCESS_H__ | |
| 6 #define CHROME_COMMON_CHILD_PROCESS_H__ | |
| 7 | |
| 8 #include <string> | |
| 9 #include <vector> | |
| 10 #include "base/basictypes.h" | |
| 11 #include "base/message_loop.h" | |
| 12 #include "base/scoped_ptr.h" | |
| 13 #include "base/waitable_event.h" | |
| 14 | |
| 15 class ChildThread; | |
| 16 | |
| 17 | |
| 18 // Base class for child processes of the browser process (i.e. renderer and | |
| 19 // plugin host). This is a singleton object for each child process. | |
| 20 class ChildProcess { | |
| 21 public: | |
| 22 // Child processes should have an object that derives from this class. The | |
| 23 // constructor will return once ChildThread has started. | |
| 24 ChildProcess(ChildThread* child_thread); | |
| 25 virtual ~ChildProcess(); | |
| 26 | |
| 27 // Getter for this process' main thread. | |
| 28 ChildThread* child_thread() { return child_thread_.get(); } | |
| 29 | |
| 30 // A global event object that is signalled when the main thread's message | |
| 31 // loop exits. This gives background threads a way to observe the main | |
| 32 // thread shutting down. This can be useful when a background thread is | |
| 33 // waiting for some information from the browser process. If the browser | |
| 34 // process goes away prematurely, the background thread can at least notice | |
| 35 // the child processes's main thread exiting to determine that it should give | |
| 36 // up waiting. | |
| 37 // For example, see the renderer code used to implement | |
| 38 // webkit_glue::GetCookies. | |
| 39 base::WaitableEvent* GetShutDownEvent(); | |
| 40 | |
| 41 // These are used for ref-counting the child process. The process shuts | |
| 42 // itself down when the ref count reaches 0. | |
| 43 // For example, in the renderer process, generally each tab managed by this | |
| 44 // process will hold a reference to the process, and release when closed. | |
| 45 void AddRefProcess(); | |
| 46 void ReleaseProcess(); | |
| 47 | |
| 48 // Getter for the one ChildProcess object for this process. | |
| 49 static ChildProcess* current() { return child_process_; } | |
| 50 | |
| 51 private: | |
| 52 // NOTE: make sure that child_thread_ is listed before shutdown_event_, since | |
| 53 // it depends on it (indirectly through IPC::SyncChannel). | |
| 54 scoped_ptr<ChildThread> child_thread_; | |
| 55 | |
| 56 int ref_count_; | |
| 57 | |
| 58 // An event that will be signalled when we shutdown. | |
| 59 base::WaitableEvent shutdown_event_; | |
| 60 | |
| 61 // The singleton instance for this process. | |
| 62 static ChildProcess* child_process_; | |
| 63 | |
| 64 DISALLOW_EVIL_CONSTRUCTORS(ChildProcess); | |
| 65 }; | |
| 66 | |
| 67 #endif // CHROME_COMMON_CHILD_PROCESS_H__ |
