From a814a8d55429605fe6d7045045cd25b6bf624580 Mon Sep 17 00:00:00 2001 From: "initial.commit" Date: Sat, 26 Jul 2008 22:41:28 +0000 Subject: Add sandbox to the repository. git-svn-id: svn://svn.chromium.org/chrome/trunk/src@13 0039d316-1c4b-4281-b951-d872f2087c98 --- sandbox/src/win2k_threadpool.h | 83 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) create mode 100644 sandbox/src/win2k_threadpool.h (limited to 'sandbox/src/win2k_threadpool.h') diff --git a/sandbox/src/win2k_threadpool.h b/sandbox/src/win2k_threadpool.h new file mode 100644 index 0000000..21bb3a7 --- /dev/null +++ b/sandbox/src/win2k_threadpool.h @@ -0,0 +1,83 @@ +// Copyright 2008, Google Inc. +// All rights reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +#ifndef SANDBOX_SRC_WIN2K_THREADPOOL_H__ +#define SANDBOX_SRC_WIN2K_THREADPOOL_H__ + +#include +#include +#include "sandbox/src/crosscall_server.h" + +namespace sandbox { + +// Win2kThreadPool a simple implementation of a thread provider as required +// for the sandbox IPC subsystem. See sandbox\crosscall_server.h for the details +// and requirements of this interface. +// +// Implementing the thread provider as a thread pool is desirable in the case +// of shared memory IPC because it can generate a large number of waitable +// events: as many as channels. A thread pool does not create a thread per +// event, instead maintains a few idle threads but can create more if the need +// arises. +// +// This implementation simply thunks to the nice thread pool API of win2k. +class Win2kThreadPool : public ThreadProvider { + public: + Win2kThreadPool() { + ::InitializeCriticalSection(&lock_); + } + ~Win2kThreadPool(); + + virtual bool RegisterWait(const void* client, HANDLE waitable_object, + CrossCallIPCCallback callback, + void* context); + + virtual bool UnRegisterWaits(void* cookie); + + // Returns the total number of non-released wait objects associated with + // the thread pool. + size_t OutstandingWaits(); + + private: + // record to keep track of a wait and its associated cookie. + struct PoolObject { + const void* cookie; + HANDLE wait; + }; + // The list of pool wait objects. + typedef std::list PoolObjects; + PoolObjects pool_objects_; + // This lock protects the list of pool wait objects. + CRITICAL_SECTION lock_; + DISALLOW_EVIL_CONSTRUCTORS(Win2kThreadPool); +}; + +} // namespace sandbox + +#endif // SANDBOX_SRC_WIN2K_THREADPOOL_H__ -- cgit v1.1