зеркало из https://github.com/mozilla/gecko-dev.git
111 строки
4.1 KiB
Plaintext
111 строки
4.1 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: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#include "nsIThread.idl"
|
|
|
|
interface nsIRunnable;
|
|
interface nsIThreadObserver;
|
|
|
|
/**
|
|
* The XPCOM thread object implements this interface, which allows a consumer
|
|
* to observe dispatch activity on the thread.
|
|
*/
|
|
[builtinclass, scriptable, uuid(a3a72e5f-71d9-4add-8f30-59a78fb6d5eb)]
|
|
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;
|
|
|
|
/**
|
|
* Add an observer that will *only* receive onProcessNextEvent,
|
|
* beforeProcessNextEvent. 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() {
|
|
* NativeQueue.signal();
|
|
* }
|
|
* onProcessNextEvent(thread, mayWait) {
|
|
* 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.
|
|
*/
|
|
[uuid(cc8da053-1776-44c2-9199-b5a629d0a19d)]
|
|
interface nsIThreadObserver : nsISupports
|
|
{
|
|
/**
|
|
* This method is called after an event has been dispatched to the thread.
|
|
* This method may be called from any thread.
|
|
*/
|
|
void onDispatchedEvent();
|
|
|
|
/**
|
|
* This method is called when nsIThread::ProcessNextEvent is called. It does
|
|
* not guarantee that an event is actually going to be 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.
|
|
*/
|
|
void onProcessNextEvent(in nsIThreadInternal thread, in boolean mayWait);
|
|
|
|
/**
|
|
* This method is called (from nsIThread::ProcessNextEvent) after an event
|
|
* is processed. It does not guarantee that an event was actually processed
|
|
* (depends on the value of |eventWasProcessed|. This method is only called
|
|
* on the target thread. DO NOT EVER RUN SCRIPT FROM THIS CALLBACK!!!
|
|
*
|
|
* @param thread
|
|
* The thread that processed another event.
|
|
* @param eventWasProcessed
|
|
* Indicates whether an event was actually processed. May be false if the
|
|
* |mayWait| flag was false when calling nsIThread::ProcessNextEvent().
|
|
*/
|
|
void afterProcessNextEvent(in nsIThreadInternal thread,
|
|
in bool eventWasProcessed);
|
|
};
|