зеркало из https://github.com/mozilla/pjs.git
191 строка
7.2 KiB
Plaintext
191 строка
7.2 KiB
Plaintext
/* -*- 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 ***** */
|
|
|
|
#include "nsIThread.idl"
|
|
|
|
interface nsIThreadObserver;
|
|
interface nsIThreadEventFilter;
|
|
|
|
/**
|
|
* The XPCOM thread object implements this interface, which allows a consumer
|
|
* to observe dispatch activity on the thread.
|
|
*/
|
|
[scriptable, uuid(e0d35c22-53d5-4b48-8627-93e05b94cf2c)]
|
|
interface nsIThreadInternal : nsIThread
|
|
{
|
|
/**
|
|
* Get/set the current thread observer (may be null). This attribute may be
|
|
* read from any thread, but must only be set on the thread corresponding to
|
|
* this thread object. The observer will be released on the thread
|
|
* corresponding to this thread object after all other events have been
|
|
* processed during a call to Shutdown.
|
|
*/
|
|
attribute nsIThreadObserver observer;
|
|
|
|
/**
|
|
* This method causes any events currently enqueued on the thread to be
|
|
* suppressed until PopEventQueue is called. Additionally, any new events
|
|
* dispatched to the thread will only be processed if they are accepted by
|
|
* the given filter. If the filter is null, then new events are accepted.
|
|
* Calls to PushEventQueue may be nested and must each be paired with a call
|
|
* to PopEventQueue in order to restore the original state of the thread.
|
|
*
|
|
* @param filter
|
|
* The thread event filter to apply to dispatched events, or null to accept
|
|
* all dispatched events.
|
|
*/
|
|
void pushEventQueue(in nsIThreadEventFilter filter);
|
|
|
|
/**
|
|
* Revert a call to PushEventQueue. When an event queue is popped, any
|
|
* events remaining in the queue are appended to the elder queue.
|
|
*/
|
|
void popEventQueue();
|
|
|
|
/**
|
|
* The current recursion depth, 0 when no events are running, 1 when a single
|
|
* event is running, and higher when nested events are running. Must only be
|
|
* called on the target thread.
|
|
*/
|
|
readonly attribute unsigned long recursionDepth;
|
|
|
|
/**
|
|
* Add an observer that will *only* receive onProcessNextEvent and
|
|
* afterProcessNextEvent callbacks. Always called on the target thread, and
|
|
* the implementation does not have to be threadsafe. Order of callbacks is
|
|
* not guaranteed (i.e. afterProcessNextEvent may be called first depending on
|
|
* whether or not the observer is added in a nested loop). Holds a strong ref.
|
|
*/
|
|
void addObserver(in nsIThreadObserver observer);
|
|
|
|
/**
|
|
* Remove an observer added via the addObserver call. Once removed the
|
|
* observer will never be called again by the thread.
|
|
*/
|
|
void removeObserver(in nsIThreadObserver observer);
|
|
};
|
|
|
|
/**
|
|
* This interface provides the observer with hooks to implement a layered
|
|
* event queue. For example, it is possible to overlay processing events
|
|
* for a GUI toolkit on top of the events for a thread:
|
|
*
|
|
* var NativeQueue;
|
|
* Observer = {
|
|
* onDispatchedEvent(thread) {
|
|
* NativeQueue.signal();
|
|
* }
|
|
* onProcessNextEvent(thread, mayWait, recursionDepth) {
|
|
* if (NativeQueue.hasNextEvent())
|
|
* NativeQueue.processNextEvent();
|
|
* while (mayWait && !thread.hasPendingEvent()) {
|
|
* NativeQueue.wait();
|
|
* NativeQueue.processNextEvent();
|
|
* }
|
|
* }
|
|
* };
|
|
*
|
|
* NOTE: The implementation of this interface must be threadsafe.
|
|
*
|
|
* NOTE: It is valid to change the thread's observer during a call to an
|
|
* observer method.
|
|
*
|
|
* NOTE: Will be split into two interfaces soon: one for onProcessNextEvent and
|
|
* afterProcessNextEvent, then another that inherits the first and adds
|
|
* onDispatchedEvent.
|
|
*/
|
|
[scriptable, uuid(81D0B509-F198-4417-8020-08EB4271491F)]
|
|
interface nsIThreadObserver : nsISupports
|
|
{
|
|
/**
|
|
* This method is called after an event has been dispatched to the thread.
|
|
* This method may be called from any thread.
|
|
*
|
|
* @param thread
|
|
* The thread where the event is being dispatched.
|
|
*/
|
|
void onDispatchedEvent(in nsIThreadInternal thread);
|
|
|
|
/**
|
|
* This method is called (from nsIThread::ProcessNextEvent) before an event
|
|
* is processed. This method is only called on the target thread.
|
|
*
|
|
* @param thread
|
|
* The thread being asked to process another event.
|
|
* @param mayWait
|
|
* Indicates whether or not the method is allowed to block the calling
|
|
* thread. For example, this parameter is false during thread shutdown.
|
|
* @param recursionDepth
|
|
* Indicates the number of calls to ProcessNextEvent on the call stack in
|
|
* addition to the current call.
|
|
*/
|
|
void onProcessNextEvent(in nsIThreadInternal thread, in boolean mayWait,
|
|
in unsigned long recursionDepth);
|
|
|
|
/**
|
|
* This method is called (from nsIThread::ProcessNextEvent) after an event
|
|
* is processed. This method is only called on the target thread.
|
|
*
|
|
* @param thread
|
|
* The thread that processed another event.
|
|
* @param recursionDepth
|
|
* Indicates the number of calls to ProcessNextEvent on the call stack in
|
|
* addition to the current call.
|
|
*/
|
|
void afterProcessNextEvent(in nsIThreadInternal thread,
|
|
in unsigned long recursionDepth);
|
|
};
|
|
|
|
/**
|
|
* Interface passed to the nsIThreadInternal::PushEventQueue method.
|
|
*/
|
|
[scriptable, uuid(a0605c0b-17f5-4681-b8cd-a1cd75d42559)]
|
|
interface nsIThreadEventFilter : nsISupports
|
|
{
|
|
/**
|
|
* This method is called to determine whether or not an event may be accepted
|
|
* by a "nested" event queue (see nsIThreadInternal::PushEventQueue).
|
|
*
|
|
* @param event
|
|
* The event being dispatched.
|
|
*
|
|
* WARNING: This method must not make any calls on the thread object.
|
|
*/
|
|
[notxpcom] boolean acceptEvent(in nsIRunnable event);
|
|
};
|