gecko/xpcom/threads/nsThread.h
2007-07-10 17:57:17 -07:00

165 lines
4.9 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla code.
*
* The Initial Developer of the Original Code is Google Inc.
* Portions created by the Initial Developer are Copyright (C) 2006
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Darin Fisher <darin@meer.net>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsThread_h__
#define nsThread_h__
#include "nsIThreadInternal.h"
#include "nsISupportsPriority.h"
#include "nsEventQueue.h"
#include "nsThreadUtils.h"
#include "nsString.h"
#include "nsAutoLock.h"
#include "nsAutoPtr.h"
// A native thread
class nsThread : public nsIThreadInternal, public nsISupportsPriority
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIEVENTTARGET
NS_DECL_NSITHREAD
NS_DECL_NSITHREADINTERNAL
NS_DECL_NSISUPPORTSPRIORITY
nsThread();
// Initialize this as a wrapper for a new PRThread.
nsresult Init();
// Initialize this as a wrapper for the current PRThread.
nsresult InitCurrentThread();
// The PRThread corresponding to this thread.
PRThread *GetPRThread() { return mThread; }
// If this flag is true, then the nsThread was created using
// nsIThreadManager::NewThread.
PRBool ShutdownRequired() { return mShutdownRequired; }
// The global thread observer
static nsIThreadObserver* sGlobalObserver;
private:
friend class nsThreadShutdownEvent;
~nsThread();
PRBool ShuttingDown() { return mShutdownContext != nsnull; }
PR_STATIC_CALLBACK(void) ThreadFunc(void *arg);
// Helper
already_AddRefed<nsIThreadObserver> GetObserver() {
nsIThreadObserver *obs;
nsThread::GetObserver(&obs);
return already_AddRefed<nsIThreadObserver>(obs);
}
// Wrappers for event queue methods:
PRBool GetEvent(PRBool mayWait, nsIRunnable **event) {
return mEvents->GetEvent(mayWait, event);
}
PRBool PutEvent(nsIRunnable *event);
// Wrapper for nsEventQueue that supports chaining.
class nsChainedEventQueue {
public:
nsChainedEventQueue(nsIThreadEventFilter *filter = nsnull)
: mNext(nsnull), mFilter(filter) {
}
PRBool IsInitialized() {
return mQueue.IsInitialized();
}
PRBool GetEvent(PRBool mayWait, nsIRunnable **event) {
return mQueue.GetEvent(mayWait, event);
}
PRBool PutEvent(nsIRunnable *event);
class nsChainedEventQueue *mNext;
private:
nsCOMPtr<nsIThreadEventFilter> mFilter;
nsEventQueue mQueue;
};
// This lock protects access to mObserver and mEvents. Both of those fields
// are only modified on the thread itself (never from another thread). This
// means that we can avoid holding the lock while using mObserver and mEvents
// on the thread itself. When calling PutEvent on mEvents, we have to hold
// the lock to synchronize with PopEventQueue.
PRLock *mLock;
nsCOMPtr<nsIThreadObserver> mObserver;
nsChainedEventQueue *mEvents; // never null
nsChainedEventQueue mEventsRoot;
PRInt32 mPriority;
PRThread *mThread;
PRUint32 mRunningEvent; // counter
struct nsThreadShutdownContext *mShutdownContext;
PRPackedBool mShutdownRequired;
PRPackedBool mShutdownPending;
};
//-----------------------------------------------------------------------------
class nsThreadSyncDispatch : public nsRunnable {
public:
nsThreadSyncDispatch(nsIThread *origin, nsIRunnable *task)
: mOrigin(origin), mSyncTask(task) {
}
PRBool IsPending() {
return mSyncTask != nsnull;
}
private:
NS_DECL_NSIRUNNABLE
nsCOMPtr<nsIThread> mOrigin;
nsCOMPtr<nsIRunnable> mSyncTask;
};
#endif // nsThread_h__