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* Added a way to notify a Module that it's been attached to a ProcessThread. The benefit of this is to give the module a way to wake up the thread when it needs work to happen on the worker thread, immediately. Today, module instances are typically registered with a process thread outside the control of the modules themselves. I.e. they typically don't know about the process thread they're attached to. * Improve ProcessThread's WakeUp algorithm to not call TimeUntilNextProcess when a WakeUp call is requested. This is an optimization for the above case which avoids the module having to acquire a lock or do an interlocked operation before calling WakeUp(), which would ensure the module's TimeUntilNextProcess() implementation would return 0. BUG=2822 R=stefan@webrtc.org Review URL: https://webrtc-codereview.appspot.com/39239004 Cr-Commit-Position: refs/heads/master@{#8527} git-svn-id: http://webrtc.googlecode.com/svn/trunk@8527 4adac7df-926f-26a2-2b94-8c16560cd09d
82 lines
2.8 KiB
C++
82 lines
2.8 KiB
C++
/*
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* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_INTERFACE_MODULE_H_
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#define MODULES_INTERFACE_MODULE_H_
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#include "webrtc/typedefs.h"
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namespace webrtc {
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class ProcessThread;
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class Module {
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public:
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// Returns the number of milliseconds until the module wants a worker
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// thread to call Process.
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// This method is called on the same worker thread as Process will
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// be called on.
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// TODO(tommi): Almost all implementations of this function, need to know
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// the current tick count. Consider passing it as an argument. It could
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// also improve the accuracy of when the next callback occurs since the
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// thread that calls Process() will also have it's tick count reference
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// which might not match with what the implementations use.
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virtual int64_t TimeUntilNextProcess() = 0;
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// Process any pending tasks such as timeouts.
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// Called on a worker thread.
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virtual int32_t Process() = 0;
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// This method is called when the module is attached to a *running* process
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// thread or detached from one. In the case of detaching, |process_thread|
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// will be nullptr.
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//
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// This method will be called in the following cases:
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//
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// * Non-null process_thread:
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// * ProcessThread::RegisterModule() is called while the thread is running.
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// * ProcessThread::Start() is called and RegisterModule has previously
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// been called. The thread will be started immediately after notifying
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// all modules.
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//
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// * Null process_thread:
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// * ProcessThread::DeRegisterModule() is called while the thread is
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// running.
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// * ProcessThread::Stop() was called and the thread has been stopped.
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//
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// NOTE: This method is not called from the worker thread itself, but from
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// the thread that registers/deregisters the module or calls Start/Stop.
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virtual void ProcessThreadAttached(ProcessThread* process_thread) {}
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protected:
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virtual ~Module() {}
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};
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// Reference counted version of the Module interface.
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class RefCountedModule : public Module {
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public:
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// Increase the reference count by one.
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// Returns the incremented reference count.
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virtual int32_t AddRef() = 0;
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// Decrease the reference count by one.
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// Returns the decreased reference count.
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// Returns 0 if the last reference was just released.
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// When the reference count reaches 0 the object will self-destruct.
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virtual int32_t Release() = 0;
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protected:
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virtual ~RefCountedModule() {}
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};
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} // namespace webrtc
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#endif // MODULES_INTERFACE_MODULE_H_
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