зеркало из https://github.com/mozilla/pjs.git
140 строки
3.6 KiB
C++
140 строки
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsThread_h__
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#define nsThread_h__
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#include "mozilla/Mutex.h"
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#include "nsIThreadInternal.h"
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#include "nsISupportsPriority.h"
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#include "nsEventQueue.h"
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#include "nsThreadUtils.h"
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#include "nsString.h"
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#include "nsTObserverArray.h"
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#include "mozilla/Attributes.h"
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// A native thread
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class nsThread MOZ_FINAL : public nsIThreadInternal,
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public nsISupportsPriority
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{
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIEVENTTARGET
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NS_DECL_NSITHREAD
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NS_DECL_NSITHREADINTERNAL
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NS_DECL_NSISUPPORTSPRIORITY
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enum MainThreadFlag {
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MAIN_THREAD,
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NOT_MAIN_THREAD
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};
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nsThread(MainThreadFlag aMainThread, PRUint32 aStackSize);
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// Initialize this as a wrapper for a new PRThread.
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nsresult Init();
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// Initialize this as a wrapper for the current PRThread.
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nsresult InitCurrentThread();
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// The PRThread corresponding to this thread.
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PRThread *GetPRThread() { return mThread; }
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// If this flag is true, then the nsThread was created using
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// nsIThreadManager::NewThread.
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bool ShutdownRequired() { return mShutdownRequired; }
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// Clear the observer list.
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void ClearObservers() { mEventObservers.Clear(); }
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private:
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friend class nsThreadShutdownEvent;
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~nsThread();
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bool ShuttingDown() { return mShutdownContext != nsnull; }
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static void ThreadFunc(void *arg);
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// Helper
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already_AddRefed<nsIThreadObserver> GetObserver() {
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nsIThreadObserver *obs;
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nsThread::GetObserver(&obs);
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return already_AddRefed<nsIThreadObserver>(obs);
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}
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// Wrappers for event queue methods:
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bool GetEvent(bool mayWait, nsIRunnable **event) {
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return mEvents.GetEvent(mayWait, event);
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}
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nsresult PutEvent(nsIRunnable *event);
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// This lock protects access to mObserver, mEvents and mEventsAreDoomed.
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// All of those fields are only modified on the thread itself (never from
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// another thread). This means that we can avoid holding the lock while
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// using mObserver and mEvents on the thread itself. When calling PutEvent
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// on mEvents, we have to hold the lock to synchronize with PopEventQueue.
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mozilla::Mutex mLock;
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nsCOMPtr<nsIThreadObserver> mObserver;
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// Only accessed on the target thread.
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nsAutoTObserverArray<nsCOMPtr<nsIThreadObserver>, 2> mEventObservers;
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nsEventQueue mEvents;
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PRInt32 mPriority;
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PRThread *mThread;
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PRUint32 mRunningEvent; // counter
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PRUint32 mStackSize;
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struct nsThreadShutdownContext *mShutdownContext;
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bool mShutdownRequired;
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bool mShutdownPending;
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// Set to true when events posted to this thread will never run.
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bool mEventsAreDoomed;
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MainThreadFlag mIsMainThread;
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};
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//-----------------------------------------------------------------------------
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class nsThreadSyncDispatch : public nsRunnable {
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public:
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nsThreadSyncDispatch(nsIThread *origin, nsIRunnable *task)
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: mOrigin(origin), mSyncTask(task), mResult(NS_ERROR_NOT_INITIALIZED) {
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}
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bool IsPending() {
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return mSyncTask != nsnull;
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}
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nsresult Result() {
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return mResult;
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}
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private:
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NS_DECL_NSIRUNNABLE
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nsCOMPtr<nsIThread> mOrigin;
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nsCOMPtr<nsIRunnable> mSyncTask;
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nsresult mResult;
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};
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namespace mozilla {
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/**
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* This function causes the main thread to fire a memory pressure event at its
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* next available opportunity.
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*
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* You may call this function from any thread.
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*/
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void ScheduleMemoryPressureEvent();
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} // namespace mozilla
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#endif // nsThread_h__
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