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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
| commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
| tree | f435a8308119effd964b339f76abb83a57c29483 /xpcom/threads/nsIThreadInternal.idl | |
| parent | Initial commit. (diff) | |
| download | firefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz firefox-26a029d407be480d791972afb5975cf62c9360a6.zip | |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'xpcom/threads/nsIThreadInternal.idl')
| -rw-r--r-- | xpcom/threads/nsIThreadInternal.idl | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/xpcom/threads/nsIThreadInternal.idl b/xpcom/threads/nsIThreadInternal.idl new file mode 100644 index 0000000000..ecc0f540f1 --- /dev/null +++ b/xpcom/threads/nsIThreadInternal.idl @@ -0,0 +1,110 @@ +/* -*- 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, rust_sync, 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); +}; |