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Diffstat (limited to 'xpcom/threads/nsIThread.idl')
| -rw-r--r-- | xpcom/threads/nsIThread.idl | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/xpcom/threads/nsIThread.idl b/xpcom/threads/nsIThread.idl new file mode 100644 index 0000000000..e6735d5d64 --- /dev/null +++ b/xpcom/threads/nsIThread.idl @@ -0,0 +1,222 @@ +/* -*- 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 "nsISerialEventTarget.idl" +#include "nsIThreadShutdown.idl" + +%{C++ +#include "mozilla/AlreadyAddRefed.h" + +namespace mozilla { +class TimeStamp; +class TimeDurationValueCalculator; +template <typename T> class BaseTimeDuration; +typedef BaseTimeDuration<TimeDurationValueCalculator> TimeDuration; +enum class EventQueuePriority; +} +%} + +[ptr] native PRThread(PRThread); +native EventQueuePriority(mozilla::EventQueuePriority); + +native nsIEventTargetPtr(nsIEventTarget*); +native nsISerialEventTargetPtr(nsISerialEventTarget*); +native TimeStamp(mozilla::TimeStamp); +native TimeDuration(mozilla::TimeDuration); + +/** + * This interface provides a high-level abstraction for an operating system + * thread. + * + * Threads have a built-in event queue, and a thread is an event target that + * can receive nsIRunnable objects (events) to be processed on the thread. + * + * See nsIThreadManager for the API used to create and locate threads. + */ +[builtinclass, scriptable, uuid(5801d193-29d1-4964-a6b7-70eb697ddf2b)] +interface nsIThread : nsISerialEventTarget +{ + /** + * @returns + * The NSPR thread object corresponding to this nsIThread. + */ + [noscript] readonly attribute PRThread PRThread; + + /** + * @returns + * Whether or not this thread may call into JS. Used in the profiler + * to avoid some unnecessary locking. + */ + [noscript] attribute boolean CanInvokeJS; + + /** + * Thread QoS priorities. Currently only supported on MacOS. + */ + + cenum QoSPriority : 32 { + QOS_PRIORITY_NORMAL, + QOS_PRIORITY_LOW + }; + + /** + * Shutdown the thread. This method prevents further dispatch of events to + * the thread, and it causes any pending events to run to completion before + * the thread joins (see PR_JoinThread) with the current thread. During this + * method call, events for the current thread may be processed. + * + * This method MAY NOT be executed from the thread itself. Instead, it is + * meant to be executed from another thread (usually the thread that created + * this thread or the main application thread). When this function returns, + * the thread will be shutdown, and it will no longer be possible to dispatch + * events to the thread. + * + * @throws NS_ERROR_UNEXPECTED + * Indicates that this method was erroneously called when this thread was + * the current thread, that this thread was not created with a call to + * nsIThreadManager::NewThread, or if this method was called more than once + * on the thread object. + */ + void shutdown(); + + /** + * This method may be called to determine if there are any events ready to be + * processed. It may only be called when this thread is the current thread. + * + * Because events may be added to this thread by another thread, a "false" + * result does not mean that this thread has no pending events. It only + * means that there were no pending events when this method was called. + * + * @returns + * A boolean value that if "true" indicates that this thread has one or + * more pending events. + * + * @throws NS_ERROR_UNEXPECTED + * Indicates that this method was erroneously called when this thread was + * not the current thread. + */ + boolean hasPendingEvents(); + + /** + * Similar to above, but checks only possible high priority queue. + */ + boolean hasPendingHighPriorityEvents(); + + /** + * Process the next event. If there are no pending events, then this method + * may wait -- depending on the value of the mayWait parameter -- until an + * event is dispatched to this thread. This method is re-entrant but may + * only be called if this thread is the current thread. + * + * @param mayWait + * A boolean parameter that if "true" indicates that the method may block + * the calling thread to wait for a pending event. + * + * @returns + * A boolean value that if "true" indicates that an event was processed. + * + * @throws NS_ERROR_UNEXPECTED + * Indicates that this method was erroneously called when this thread was + * not the current thread. + */ + boolean processNextEvent(in boolean mayWait); + + /** + * Shutdown the thread asynchronously. This method immediately prevents + * further dispatch of events to the thread, and it causes any pending events + * to run to completion before this thread joins with the current thread. + * + * UNLIKE shutdown() this does not process events on the current thread. + * Instead it merely ensures that the current thread continues running until + * this thread has shut down. + * + * This method MAY NOT be executed from the thread itself. Instead, it is + * meant to be executed from another thread (usually the thread that created + * this thread or the main application thread). When this function returns, + * the thread will continue running until it exhausts its event queue. + * + * @throws NS_ERROR_UNEXPECTED + * Indicates that this method was erroneously called when this thread was + * the current thread, that this thread was not created with a call to + * nsIThreadManager::NewNamedThread, or that this method was called more + * than once on the thread object. + */ + void asyncShutdown(); + + /** + * Like `asyncShutdown`, but also returns a nsIThreadShutdown instance to + * allow observing and controlling the thread's async shutdown progress. + */ + nsIThreadShutdown beginShutdown(); + + /** + * Dispatch an event to a specified queue for the thread. This function + * may be called from any thread, and it may be called re-entrantly. + * Most users should use the NS_Dispatch*() functions in nsThreadUtils instead + * of calling this directly. + * + * @param event + * The alreadyAddRefed<> event to dispatch. + * NOTE that the event will be leaked if it fails to dispatch. + * @param queue + * Which event priority queue this should be added to + * + * @throws NS_ERROR_INVALID_ARG + * Indicates that event is null. + * @throws NS_ERROR_UNEXPECTED + * Indicates that the thread is shutting down and has finished processing + * events, so this event would never run and has not been dispatched. + */ + [noscript] void dispatchToQueue(in alreadyAddRefed_nsIRunnable event, + in EventQueuePriority queue); + + /** + * This is set to the end of the last 50+ms event that was executed on + * this thread (for MainThread only). Otherwise returns a null TimeStamp. + */ + [noscript] readonly attribute TimeStamp lastLongTaskEnd; + [noscript] readonly attribute TimeStamp lastLongNonIdleTaskEnd; + + /** + * Get information on the timing of the currently-running event. + * + * @param delay + * The amount of time the current running event in the specified queue waited + * to run. Will return TimeDuration() if the queue is empty or has not run any + * new events since event delay monitoring started. NOTE: delay will be + * TimeDuration() if this thread uses a PrioritizedEventQueue (i.e. MainThread) + * and the event priority is below Input. + * @param start + * The time the currently running event began to run, or TimeStamp() if no + * event is running. + */ + [noscript] void getRunningEventDelay(out TimeDuration delay, out TimeStamp start); + + /** + * Set information on the timing of the currently-running event. + * Overrides the values returned by getRunningEventDelay + * + * @param delay + * Delay the running event spent in queues, or TimeDuration() if + * there's no running event. + * @param start + * The time the currently running event began to run, or TimeStamp() if no + * event is running. + */ + [noscript] void setRunningEventDelay(in TimeDuration delay, in TimeStamp start); + + [noscript] void setNameForWakeupTelemetry(in ACString name); + + /** + * Set the QoS priority of threads where this may be available. Currently + * restricted to MacOS. Must be on the thread to call this method. + * + * @param aPriority + * The specified priority we will adjust to. Can be low (background) or + * normal (default / user-interactive) + */ + [noscript] void setThreadQoS(in nsIThread_QoSPriority aPriority); + +}; |