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comparison: security/sandbox/win/src/win2k_threadpool.h
security/sandbox/win/src/win2k_threadpool.h
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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 <list> | |
| 9 #include <algorithm> | |
| 10 #include "sandbox/win/src/crosscall_server.h" | |
| 11 | |
| 12 namespace sandbox { | |
| 13 | |
| 14 // Win2kThreadPool a simple implementation of a thread provider as required | |
| 15 // for the sandbox IPC subsystem. See sandbox\crosscall_server.h for the details | |
| 16 // and requirements of this interface. | |
| 17 // | |
| 18 // Implementing the thread provider as a thread pool is desirable in the case | |
| 19 // of shared memory IPC because it can generate a large number of waitable | |
| 20 // events: as many as channels. A thread pool does not create a thread per | |
| 21 // event, instead maintains a few idle threads but can create more if the need | |
| 22 // arises. | |
| 23 // | |
| 24 // This implementation simply thunks to the nice thread pool API of win2k. | |
| 25 class Win2kThreadPool : public ThreadProvider { | |
| 26 public: | |
| 27 Win2kThreadPool() { | |
| 28 ::InitializeCriticalSection(&lock_); | |
| 29 } | |
| 30 virtual ~Win2kThreadPool(); | |
| 31 | |
| 32 virtual bool RegisterWait(const void* cookie, HANDLE waitable_object, | |
| 33 CrossCallIPCCallback callback, | |
| 34 void* context); | |
| 35 | |
| 36 virtual bool UnRegisterWaits(void* cookie); | |
| 37 | |
| 38 // Returns the total number of wait objects associated with | |
| 39 // the thread pool. | |
| 40 size_t OutstandingWaits(); | |
| 41 | |
| 42 private: | |
| 43 // record to keep track of a wait and its associated cookie. | |
| 44 struct PoolObject { | |
| 45 const void* cookie; | |
| 46 HANDLE wait; | |
| 47 }; | |
| 48 // The list of pool wait objects. | |
| 49 typedef std::list<PoolObject> PoolObjects; | |
| 50 PoolObjects pool_objects_; | |
| 51 // This lock protects the list of pool wait objects. | |
| 52 CRITICAL_SECTION lock_; | |
| 53 DISALLOW_COPY_AND_ASSIGN(Win2kThreadPool); | |
| 54 }; | |
| 55 | |
| 56 } // namespace sandbox | |
| 57 | |
| 58 #endif // SANDBOX_SRC_WIN2K_THREADPOOL_H_ |
