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377 lines
10 KiB
C++
377 lines
10 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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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla code.
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*
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* The Initial Developer of the Original Code is Google Inc.
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* Portions created by the Initial Developer are Copyright (C) 2006
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Darin Fisher <darin@meer.net>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsThreadUtils_h__
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#define nsThreadUtils_h__
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#include "prthread.h"
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#include "prinrval.h"
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#include "nsIThreadManager.h"
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#include "nsIThread.h"
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#include "nsIRunnable.h"
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#include "nsStringGlue.h"
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#include "nsCOMPtr.h"
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// This is needed on some systems to prevent collisions between the symbols
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// appearing in xpcom_core and xpcomglue. It may be unnecessary in the future
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// with better toolchain support.
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#ifdef MOZILLA_INTERNAL_API
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# define NS_NewThread NS_NewThread_P
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# define NS_GetCurrentThread NS_GetCurrentThread_P
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# define NS_GetMainThread NS_GetMainThread_P
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# define NS_IsMainThread NS_IsMainThread_P
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# define NS_DispatchToCurrentThread NS_DispatchToCurrentThread_P
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# define NS_DispatchToMainThread NS_DispatchToMainThread_P
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# define NS_ProcessPendingEvents NS_ProcessPendingEvents_P
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# define NS_HasPendingEvents NS_HasPendingEvents_P
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# define NS_ProcessNextEvent NS_ProcessNextEvent_P
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#endif
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//-----------------------------------------------------------------------------
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// These methods are alternatives to the methods on nsIThreadManager, provided
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// for convenience.
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/**
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* Create a new thread, and optionally provide an initial event for the thread.
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*
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* @param result
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* The resulting nsIThread object.
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* @param initialEvent
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* The initial event to run on this thread. This parameter may be null.
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*
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* @returns NS_ERROR_INVALID_ARG
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* Indicates that the given name is not unique.
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*/
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extern NS_COM_GLUE NS_METHOD
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NS_NewThread(nsIThread **result, nsIRunnable *initialEvent = nsnull);
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/**
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* Get a reference to the current thread.
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*
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* @param result
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* The resulting nsIThread object.
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*/
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extern NS_COM_GLUE NS_METHOD
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NS_GetCurrentThread(nsIThread **result);
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/**
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* Get a reference to the main thread.
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*
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* @param result
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* The resulting nsIThread object.
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*/
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extern NS_COM_GLUE NS_METHOD
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NS_GetMainThread(nsIThread **result);
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/**
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* Test to see if the current thread is the main thread.
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*
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* @returns PR_TRUE if the current thread is the main thread, and PR_FALSE
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* otherwise.
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*/
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extern NS_COM_GLUE NS_METHOD_(PRBool)
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NS_IsMainThread();
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/**
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* Dispatch the given event to the current thread.
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*
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* @param event
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* The event to dispatch.
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*
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* @returns NS_ERROR_INVALID_ARG
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* If event is null.
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*/
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extern NS_COM_GLUE NS_METHOD
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NS_DispatchToCurrentThread(nsIRunnable *event);
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/**
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* Dispatch the given event to the main thread.
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*
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* @param event
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* The event to dispatch.
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* @param dispatchFlags
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* The flags to pass to the main thread's dispatch method.
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*
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* @returns NS_ERROR_INVALID_ARG
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* If event is null.
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*/
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extern NS_COM_GLUE NS_METHOD
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NS_DispatchToMainThread(nsIRunnable *event,
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PRUint32 dispatchFlags = NS_DISPATCH_NORMAL);
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#ifndef XPCOM_GLUE_AVOID_NSPR
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/**
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* Process all pending events for the given thread before returning. This
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* method simply calls ProcessNextEvent on the thread while HasPendingEvents
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* continues to return true and the time spent in NS_ProcessPendingEvents
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* does not exceed the given timeout value.
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*
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* @param thread
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* The thread object for which to process pending events. If null, then
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* events will be processed for the current thread.
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* @param timeout
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* The maximum number of milliseconds to spend processing pending events.
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* Events are not pre-empted to honor this timeout. Rather, the timeout
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* value is simply used to determine whether or not to process another event.
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* Pass PR_INTERVAL_NO_TIMEOUT to specify no timeout.
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*/
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extern NS_COM_GLUE NS_METHOD
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NS_ProcessPendingEvents(nsIThread *thread,
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PRIntervalTime timeout = PR_INTERVAL_NO_TIMEOUT);
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#endif
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/**
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* Shortcut for nsIThread::HasPendingEvents.
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*
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* It is an error to call this function when the given thread is not the
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* current thread. This function will return PR_FALSE if called from some
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* other thread.
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*
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* @param thread
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* The current thread or null.
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*
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* @returns
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* A boolean value that if "true" indicates that there are pending events
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* in the current thread's event queue.
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*/
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extern NS_COM_GLUE PRBool
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NS_HasPendingEvents(nsIThread *thread = nsnull);
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/**
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* Shortcut for nsIThread::ProcessNextEvent.
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*
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* It is an error to call this function when the given thread is not the
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* current thread. This function will simply return PR_FALSE if called
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* from some other thread.
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*
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* @param thread
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* The current thread or null.
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* @param mayWait
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* A boolean parameter that if "true" indicates that the method may block
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* the calling thread to wait for a pending event.
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*
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* @returns
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* A boolean value that if "true" indicates that an event from the current
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* thread's event queue was processed.
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*/
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extern NS_COM_GLUE PRBool
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NS_ProcessNextEvent(nsIThread *thread = nsnull, PRBool mayWait = PR_TRUE);
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//-----------------------------------------------------------------------------
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// Helpers that work with nsCOMPtr:
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inline already_AddRefed<nsIThread>
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do_GetCurrentThread() {
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nsIThread *thread = nsnull;
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NS_GetCurrentThread(&thread);
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return already_AddRefed<nsIThread>(thread);
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}
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inline already_AddRefed<nsIThread>
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do_GetMainThread() {
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nsIThread *thread = nsnull;
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NS_GetMainThread(&thread);
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return already_AddRefed<nsIThread>(thread);
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}
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//-----------------------------------------------------------------------------
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#ifdef MOZILLA_INTERNAL_API
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// Fast access to the current thread. Do not release the returned pointer! If
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// you want to use this pointer from some other thread, then you will need to
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// AddRef it. Otherwise, you should only consider this pointer valid from code
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// running on the current thread.
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extern NS_COM_GLUE nsIThread *NS_GetCurrentThread();
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#endif
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//-----------------------------------------------------------------------------
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#ifndef XPCOM_GLUE_AVOID_NSPR
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#undef IMETHOD_VISIBILITY
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#define IMETHOD_VISIBILITY NS_COM_GLUE
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// This class is designed to be subclassed.
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class NS_COM_GLUE nsRunnable : public nsIRunnable
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{
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIRUNNABLE
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nsRunnable() {
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}
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protected:
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virtual ~nsRunnable() {
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}
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};
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#undef IMETHOD_VISIBILITY
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#define IMETHOD_VISIBILITY NS_VISIBILITY_HIDDEN
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// An event that can be used to call a method on a class. The class type must
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// support reference counting.
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template <class T>
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class nsRunnableMethod : public nsRunnable
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{
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public:
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typedef void (T::*Method)();
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nsRunnableMethod(T *obj, Method method)
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: mObj(obj), mMethod(method) {
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NS_ADDREF(mObj);
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}
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NS_IMETHOD Run() {
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(mObj->*mMethod)();
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return NS_OK;
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}
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private:
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virtual ~nsRunnableMethod() {
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NS_RELEASE(mObj);
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}
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T *mObj;
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Method mMethod;
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};
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// Use this helper macro like so:
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//
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// nsCOMPtr<nsIRunnable> event =
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// NS_NEW_RUNNABLE_METHOD(MyClass, myObject, HandleEvent);
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// NS_DispatchToCurrentThread(event);
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//
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// Constraints:
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// - myObject must be of type MyClass
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// - MyClass must defined AddRef and Release methods
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//
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// NOTE: Attempts to make this a template function caused VC6 to barf :-(
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//
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#define NS_NEW_RUNNABLE_METHOD(class_, obj_, method_) \
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new nsRunnableMethod<class_>(obj_, &class_::method_)
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#endif // XPCOM_GLUE_AVOID_NSPR
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// This class is designed to be used when you have an event class E that has a
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// pointer back to resource class R. If R goes away while E is still pending,
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// then it is important to "revoke" E so that it does not try use R after R has
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// been destroyed. nsRevocableEventPtr makes it easy for R to manage such
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// situations:
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//
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// class R;
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//
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// class E : public nsRunnable {
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// public:
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// void Revoke() {
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// mResource = nsnull;
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// }
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// private:
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// R *mResource;
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// };
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//
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// class R {
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// public:
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// void EventHandled() {
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// mEvent.Forget();
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// }
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// private:
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// nsRevocableEventPtr<E> mEvent;
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// };
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//
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// void R::PostEvent() {
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// // Make sure any pending event is revoked.
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// mEvent->Revoke();
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//
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// nsCOMPtr<nsIRunnable> event = new E();
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// if (NS_SUCCEEDED(NS_DispatchToCurrentThread(event))) {
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// // Keep pointer to event so we can revoke it.
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// mEvent = event;
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// }
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// }
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//
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// NS_IMETHODIMP E::Run() {
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// if (!mResource)
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// return NS_OK;
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// ...
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// mResource->EventHandled();
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// return NS_OK;
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// }
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//
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template <class T>
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class nsRevocableEventPtr {
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public:
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nsRevocableEventPtr()
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: mEvent(nsnull) {
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}
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~nsRevocableEventPtr() {
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Revoke();
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}
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const nsRevocableEventPtr& operator=(T *event) {
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Revoke();
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mEvent = event;
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return *this;
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}
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void Revoke() {
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if (mEvent) {
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mEvent->Revoke();
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mEvent = nsnull;
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}
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}
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void Forget() {
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mEvent = nsnull;
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}
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PRBool IsPending() {
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return mEvent != nsnull;
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}
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private:
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// Not implemented
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nsRevocableEventPtr(const nsRevocableEventPtr&);
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nsRevocableEventPtr& operator=(const nsRevocableEventPtr&);
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T *mEvent;
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};
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#endif // nsThreadUtils_h__
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