forked from mirrors/gecko-dev
effc2ca999
All event targets should be threadsafe and implemented in C++, and so should be able to be used in `Sync` types in Rust code. This also required annotating all interfaces deriving from `nsIEventTarget`, as well as adding some associated constants to specific types to indicate to the static assertion that they have threadsafe reference counts. Differential Revision: https://phabricator.services.mozilla.com/D183592
222 lines
8.3 KiB
Text
222 lines
8.3 KiB
Text
/* -*- 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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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsISerialEventTarget.idl"
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#include "nsIThreadShutdown.idl"
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%{C++
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#include "mozilla/AlreadyAddRefed.h"
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namespace mozilla {
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class TimeStamp;
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class TimeDurationValueCalculator;
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template <typename T> class BaseTimeDuration;
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typedef BaseTimeDuration<TimeDurationValueCalculator> TimeDuration;
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enum class EventQueuePriority;
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}
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%}
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[ptr] native PRThread(PRThread);
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native EventQueuePriority(mozilla::EventQueuePriority);
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native nsIEventTargetPtr(nsIEventTarget*);
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native nsISerialEventTargetPtr(nsISerialEventTarget*);
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native TimeStamp(mozilla::TimeStamp);
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native TimeDuration(mozilla::TimeDuration);
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/**
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* This interface provides a high-level abstraction for an operating system
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* thread.
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*
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* Threads have a built-in event queue, and a thread is an event target that
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* can receive nsIRunnable objects (events) to be processed on the thread.
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*
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* See nsIThreadManager for the API used to create and locate threads.
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*/
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[builtinclass, scriptable, rust_sync, uuid(5801d193-29d1-4964-a6b7-70eb697ddf2b)]
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interface nsIThread : nsISerialEventTarget
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{
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/**
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* @returns
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* The NSPR thread object corresponding to this nsIThread.
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*/
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[noscript] readonly attribute PRThread PRThread;
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/**
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* @returns
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* Whether or not this thread may call into JS. Used in the profiler
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* to avoid some unnecessary locking.
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*/
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[noscript] attribute boolean CanInvokeJS;
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/**
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* Thread QoS priorities. Currently only supported on MacOS.
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*/
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cenum QoSPriority : 32 {
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QOS_PRIORITY_NORMAL,
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QOS_PRIORITY_LOW
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};
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/**
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* Shutdown the thread. This method prevents further dispatch of events to
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* the thread, and it causes any pending events to run to completion before
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* the thread joins (see PR_JoinThread) with the current thread. During this
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* method call, events for the current thread may be processed.
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*
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* This method MAY NOT be executed from the thread itself. Instead, it is
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* meant to be executed from another thread (usually the thread that created
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* this thread or the main application thread). When this function returns,
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* the thread will be shutdown, and it will no longer be possible to dispatch
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* events to the thread.
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*
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* @throws NS_ERROR_UNEXPECTED
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* Indicates that this method was erroneously called when this thread was
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* the current thread, that this thread was not created with a call to
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* nsIThreadManager::NewThread, or if this method was called more than once
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* on the thread object.
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*/
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void shutdown();
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/**
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* This method may be called to determine if there are any events ready to be
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* processed. It may only be called when this thread is the current thread.
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*
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* Because events may be added to this thread by another thread, a "false"
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* result does not mean that this thread has no pending events. It only
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* means that there were no pending events when this method was called.
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*
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* @returns
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* A boolean value that if "true" indicates that this thread has one or
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* more pending events.
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*
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* @throws NS_ERROR_UNEXPECTED
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* Indicates that this method was erroneously called when this thread was
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* not the current thread.
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*/
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boolean hasPendingEvents();
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/**
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* Similar to above, but checks only possible high priority queue.
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*/
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boolean hasPendingHighPriorityEvents();
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/**
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* Process the next event. If there are no pending events, then this method
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* may wait -- depending on the value of the mayWait parameter -- until an
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* event is dispatched to this thread. This method is re-entrant but may
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* only be called if this thread is the current thread.
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*
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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 was processed.
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*
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* @throws NS_ERROR_UNEXPECTED
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* Indicates that this method was erroneously called when this thread was
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* not the current thread.
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*/
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boolean processNextEvent(in boolean mayWait);
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/**
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* Shutdown the thread asynchronously. This method immediately prevents
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* further dispatch of events to the thread, and it causes any pending events
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* to run to completion before this thread joins with the current thread.
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*
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* UNLIKE shutdown() this does not process events on the current thread.
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* Instead it merely ensures that the current thread continues running until
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* this thread has shut down.
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*
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* This method MAY NOT be executed from the thread itself. Instead, it is
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* meant to be executed from another thread (usually the thread that created
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* this thread or the main application thread). When this function returns,
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* the thread will continue running until it exhausts its event queue.
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*
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* @throws NS_ERROR_UNEXPECTED
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* Indicates that this method was erroneously called when this thread was
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* the current thread, that this thread was not created with a call to
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* nsIThreadManager::NewNamedThread, or that this method was called more
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* than once on the thread object.
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*/
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void asyncShutdown();
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/**
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* Like `asyncShutdown`, but also returns a nsIThreadShutdown instance to
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* allow observing and controlling the thread's async shutdown progress.
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*/
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nsIThreadShutdown beginShutdown();
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/**
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* Dispatch an event to a specified queue for the thread. This function
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* may be called from any thread, and it may be called re-entrantly.
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* Most users should use the NS_Dispatch*() functions in nsThreadUtils instead
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* of calling this directly.
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*
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* @param event
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* The alreadyAddRefed<> event to dispatch.
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* NOTE that the event will be leaked if it fails to dispatch.
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* @param queue
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* Which event priority queue this should be added to
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*
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* @throws NS_ERROR_INVALID_ARG
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* Indicates that event is null.
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* @throws NS_ERROR_UNEXPECTED
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* Indicates that the thread is shutting down and has finished processing
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* events, so this event would never run and has not been dispatched.
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*/
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[noscript] void dispatchToQueue(in alreadyAddRefed_nsIRunnable event,
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in EventQueuePriority queue);
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/**
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* This is set to the end of the last 50+ms event that was executed on
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* this thread (for MainThread only). Otherwise returns a null TimeStamp.
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*/
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[noscript] readonly attribute TimeStamp lastLongTaskEnd;
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[noscript] readonly attribute TimeStamp lastLongNonIdleTaskEnd;
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/**
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* Get information on the timing of the currently-running event.
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*
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* @param delay
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* The amount of time the current running event in the specified queue waited
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* to run. Will return TimeDuration() if the queue is empty or has not run any
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* new events since event delay monitoring started. NOTE: delay will be
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* TimeDuration() if this thread uses a PrioritizedEventQueue (i.e. MainThread)
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* and the event priority is below Input.
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* @param start
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* The time the currently running event began to run, or TimeStamp() if no
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* event is running.
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*/
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[noscript] void getRunningEventDelay(out TimeDuration delay, out TimeStamp start);
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/**
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* Set information on the timing of the currently-running event.
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* Overrides the values returned by getRunningEventDelay
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*
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* @param delay
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* Delay the running event spent in queues, or TimeDuration() if
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* there's no running event.
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* @param start
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* The time the currently running event began to run, or TimeStamp() if no
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* event is running.
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*/
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[noscript] void setRunningEventDelay(in TimeDuration delay, in TimeStamp start);
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[noscript] void setNameForWakeupTelemetry(in ACString name);
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/**
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* Set the QoS priority of threads where this may be available. Currently
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* restricted to MacOS. Must be on the thread to call this method.
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*
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* @param aPriority
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* The specified priority we will adjust to. Can be low (background) or
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* normal (default / user-interactive)
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*/
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[noscript] void setThreadQoS(in nsIThread_QoSPriority aPriority);
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};
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