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+/* -*- 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);
+
+};