security/sandbox/win/src/win2k_threadpool.h@6474c204b198 (annotated)
security/sandbox/win/src/win2k_threadpool.h
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| michael@0 | 2 | // Use of this source code is governed by a BSD-style license that can be |
| michael@0 | 3 | // found in the LICENSE file. |
| michael@0 | 4 | |
| michael@0 | 5 | #ifndef SANDBOX_SRC_WIN2K_THREADPOOL_H_ |
| michael@0 | 6 | #define SANDBOX_SRC_WIN2K_THREADPOOL_H_ |
| michael@0 | 7 | |
| michael@0 | 8 | #include <list> |
| michael@0 | 9 | #include <algorithm> |
| michael@0 | 10 | #include "sandbox/win/src/crosscall_server.h" |
| michael@0 | 11 | |
| michael@0 | 12 | namespace sandbox { |
| michael@0 | 13 | |
| michael@0 | 14 | // Win2kThreadPool a simple implementation of a thread provider as required |
| michael@0 | 15 | // for the sandbox IPC subsystem. See sandbox\crosscall_server.h for the details |
| michael@0 | 16 | // and requirements of this interface. |
| michael@0 | 17 | // |
| michael@0 | 18 | // Implementing the thread provider as a thread pool is desirable in the case |
| michael@0 | 19 | // of shared memory IPC because it can generate a large number of waitable |
| michael@0 | 20 | // events: as many as channels. A thread pool does not create a thread per |
| michael@0 | 21 | // event, instead maintains a few idle threads but can create more if the need |
| michael@0 | 22 | // arises. |
| michael@0 | 23 | // |
| michael@0 | 24 | // This implementation simply thunks to the nice thread pool API of win2k. |
| michael@0 | 25 | class Win2kThreadPool : public ThreadProvider { |
| michael@0 | 26 | public: |
| michael@0 | 27 | Win2kThreadPool() { |
| michael@0 | 28 | ::InitializeCriticalSection(&lock_); |
| michael@0 | 29 | } |
| michael@0 | 30 | virtual ~Win2kThreadPool(); |
| michael@0 | 31 | |
| michael@0 | 32 | virtual bool RegisterWait(const void* cookie, HANDLE waitable_object, |
| michael@0 | 33 | CrossCallIPCCallback callback, |
| michael@0 | 34 | void* context); |
| michael@0 | 35 | |
| michael@0 | 36 | virtual bool UnRegisterWaits(void* cookie); |
| michael@0 | 37 | |
| michael@0 | 38 | // Returns the total number of wait objects associated with |
| michael@0 | 39 | // the thread pool. |
| michael@0 | 40 | size_t OutstandingWaits(); |
| michael@0 | 41 | |
| michael@0 | 42 | private: |
| michael@0 | 43 | // record to keep track of a wait and its associated cookie. |
| michael@0 | 44 | struct PoolObject { |
| michael@0 | 45 | const void* cookie; |
| michael@0 | 46 | HANDLE wait; |
| michael@0 | 47 | }; |
| michael@0 | 48 | // The list of pool wait objects. |
| michael@0 | 49 | typedef std::list<PoolObject> PoolObjects; |
| michael@0 | 50 | PoolObjects pool_objects_; |
| michael@0 | 51 | // This lock protects the list of pool wait objects. |
| michael@0 | 52 | CRITICAL_SECTION lock_; |
| michael@0 | 53 | DISALLOW_COPY_AND_ASSIGN(Win2kThreadPool); |
| michael@0 | 54 | }; |
| michael@0 | 55 | |
| michael@0 | 56 | } // namespace sandbox |
| michael@0 | 57 | |
| michael@0 | 58 | #endif // SANDBOX_SRC_WIN2K_THREADPOOL_H_ |
