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1 // Copyright (c) 2012 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 SANDBOX_SRC_WIN2K_THREADPOOL_H_ | |
6 #define SANDBOX_SRC_WIN2K_THREADPOOL_H_ | |
7 | |
8 #include <stddef.h> | |
9 | |
10 #include <algorithm> | |
11 #include <list> | |
12 #include "base/macros.h" | |
13 #include "sandbox/win/src/crosscall_server.h" | |
14 | |
15 namespace sandbox { | |
16 | |
17 // Win2kThreadPool a simple implementation of a thread provider as required | |
18 // for the sandbox IPC subsystem. See sandbox\crosscall_server.h for the details | |
19 // and requirements of this interface. | |
20 // | |
21 // Implementing the thread provider as a thread pool is desirable in the case | |
22 // of shared memory IPC because it can generate a large number of waitable | |
23 // events: as many as channels. A thread pool does not create a thread per | |
24 // event, instead maintains a few idle threads but can create more if the need | |
25 // arises. | |
26 // | |
27 // This implementation simply thunks to the nice thread pool API of win2k. | |
28 class Win2kThreadPool : public ThreadProvider { | |
29 public: | |
30 Win2kThreadPool(); | |
31 ~Win2kThreadPool() override; | |
32 | |
33 bool RegisterWait(const void* cookie, | |
34 HANDLE waitable_object, | |
35 CrossCallIPCCallback callback, | |
36 void* context) override; | |
37 | |
38 bool UnRegisterWaits(void* cookie) override; | |
39 | |
40 // Returns the total number of wait objects associated with | |
41 // the thread pool. | |
42 size_t OutstandingWaits(); | |
43 | |
44 private: | |
45 // record to keep track of a wait and its associated cookie. | |
46 struct PoolObject { | |
47 const void* cookie; | |
48 HANDLE wait; | |
49 }; | |
50 // The list of pool wait objects. | |
51 typedef std::list<PoolObject> PoolObjects; | |
52 PoolObjects pool_objects_; | |
53 // This lock protects the list of pool wait objects. | |
54 CRITICAL_SECTION lock_; | |
55 | |
56 DISALLOW_COPY_AND_ASSIGN(Win2kThreadPool); | |
57 }; | |
58 | |
59 } // namespace sandbox | |
60 | |
61 #endif // SANDBOX_SRC_WIN2K_THREADPOOL_H_ | |
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