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Side by Side Diff: content/browser/browser_thread.h

Issue 7800015: prune down content_dll change to just the CONTENT_EXPORTS (Closed)
Patch Set: fix exports for switches, content_main Created 9 years, 3 months ago
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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2011 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 #ifndef CONTENT_BROWSER_BROWSER_THREAD_H_ 5 #ifndef CONTENT_BROWSER_BROWSER_THREAD_H_
6 #define CONTENT_BROWSER_BROWSER_THREAD_H_ 6 #define CONTENT_BROWSER_BROWSER_THREAD_H_
7 #pragma once 7 #pragma once
8 8
9 #include "base/callback.h" 9 #include "base/callback.h"
10 #include "base/synchronization/lock.h" 10 #include "base/synchronization/lock.h"
11 #include "base/task.h" 11 #include "base/task.h"
12 #include "base/threading/thread.h" 12 #include "base/threading/thread.h"
13 13
14 #if defined(UNIT_TEST) 14 #if defined(UNIT_TEST)
15 #include "base/logging.h" 15 #include "base/logging.h"
16 #endif // UNIT_TEST 16 #endif // UNIT_TEST
17 17
18 #include "content/common/content_export.h"
darin (slow to review) 2011/09/04 15:41:04 move up to main block of includes. it is normal f
Dirk Pranke 2011/09/07 01:46:07 Done.
19
18 namespace base { 20 namespace base {
19 class MessageLoopProxy; 21 class MessageLoopProxy;
20 } 22 }
21 23
22 /////////////////////////////////////////////////////////////////////////////// 24 ///////////////////////////////////////////////////////////////////////////////
23 // BrowserThread 25 // BrowserThread
24 // 26 //
25 // This class represents a thread that is known by a browser-wide name. For 27 // This class represents a thread that is known by a browser-wide name. For
26 // example, there is one IO thread for the entire browser process, and various 28 // example, there is one IO thread for the entire browser process, and various
27 // pieces of code find it useful to retrieve a pointer to the IO thread's 29 // pieces of code find it useful to retrieve a pointer to the IO thread's
28 // Invoke a task by thread ID: 30 // Invoke a task by thread ID:
29 // 31 //
30 // BrowserThread::PostTask(BrowserThread::IO, FROM_HERE, task); 32 // BrowserThread::PostTask(BrowserThread::IO, FROM_HERE, task);
31 // 33 //
32 // The return value is false if the task couldn't be posted because the target 34 // The return value is false if the task couldn't be posted because the target
33 // thread doesn't exist. If this could lead to data loss, you need to check the 35 // thread doesn't exist. If this could lead to data loss, you need to check the
34 // result and restructure the code to ensure it doesn't occur. 36 // result and restructure the code to ensure it doesn't occur.
35 // 37 //
36 // This class automatically handles the lifetime of different threads. 38 // This class automatically handles the lifetime of different threads.
37 // It's always safe to call PostTask on any thread. If it's not yet created, 39 // It's always safe to call PostTask on any thread. If it's not yet created,
38 // the task is deleted. There are no race conditions. If the thread that the 40 // the task is deleted. There are no race conditions. If the thread that the
39 // task is posted to is guaranteed to outlive the current thread, then no locks 41 // task is posted to is guaranteed to outlive the current thread, then no locks
40 // are used. You should never need to cache pointers to MessageLoops, since 42 // are used. You should never need to cache pointers to MessageLoops, since
41 // they're not thread safe. 43 // they're not thread safe.
42 class BrowserThread : public base::Thread { 44 class CONTENT_EXPORT BrowserThread : public base::Thread {
43 public: 45 public:
44 // An enumeration of the well-known threads. 46 // An enumeration of the well-known threads.
45 // NOTE: threads must be listed in the order of their life-time, with each 47 // NOTE: threads must be listed in the order of their life-time, with each
46 // thread outliving every other thread below it. 48 // thread outliving every other thread below it.
47 enum ID { 49 enum ID {
48 // The main thread in the browser. 50 // The main thread in the browser.
49 UI, 51 UI,
50 52
51 // This is the thread that interacts with the database. 53 // This is the thread that interacts with the database.
52 DB, 54 DB,
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241 static base::Lock lock_; 243 static base::Lock lock_;
242 244
243 // An array of the BrowserThread objects. This array is protected by |lock_|. 245 // An array of the BrowserThread objects. This array is protected by |lock_|.
244 // The threads are not owned by this array. Typically, the threads are owned 246 // The threads are not owned by this array. Typically, the threads are owned
245 // on the UI thread by the g_browser_process object. BrowserThreads remove 247 // on the UI thread by the g_browser_process object. BrowserThreads remove
246 // themselves from this array upon destruction. 248 // themselves from this array upon destruction.
247 static BrowserThread* browser_threads_[ID_COUNT]; 249 static BrowserThread* browser_threads_[ID_COUNT];
248 }; 250 };
249 251
250 #endif // CONTENT_BROWSER_BROWSER_THREAD_H_ 252 #endif // CONTENT_BROWSER_BROWSER_THREAD_H_
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