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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 "nsIEventTarget.idl"
+#include "nsIThread.idl"
+
+[uuid(ef194cab-3f86-4b61-b132-e5e96a79e5d1)]
+interface nsIThreadPoolListener : nsISupports
+{
+ /**
+ * Called when a new thread is created by the thread pool. The notification
+ * happens on the newly-created thread.
+ */
+ void onThreadCreated();
+
+ /**
+ * Called when a thread is about to be destroyed by the thread pool. The
+ * notification happens on the thread that is about to be destroyed.
+ */
+ void onThreadShuttingDown();
+};
+
+/**
+ * An interface to a thread pool. A thread pool creates a limited number of
+ * anonymous (unnamed) worker threads. An event dispatched to the thread pool
+ * will be run on the next available worker thread.
+ */
+[uuid(76ce99c9-8e43-489a-9789-f27cc4424965)]
+interface nsIThreadPool : nsIEventTarget
+{
+ /**
+ * Set the entire pool's QoS priority. If the priority has not changed, do nothing.
+ * Existing threads will update their QoS priority the next time they become
+ * active, and newly created threads will set this QoS priority upon creation.
+ */
+ [noscript] void setQoSForThreads(in nsIThread_QoSPriority aPriority);
+
+ /**
+ * Shutdown the thread pool. This method may not be executed from any thread
+ * in the thread pool. Instead, it is meant to be executed from another
+ * thread (usually the thread that created this thread pool). When this
+ * function returns, the thread pool and all of its threads will be shutdown,
+ * and it will no longer be possible to dispatch tasks to the thread pool.
+ *
+ * As a side effect, events on the current thread will be processed.
+ */
+ void shutdown();
+
+ /**
+ * Shutdown the thread pool, but only wait for aTimeoutMs. After the timeout
+ * expires, any threads that have not shutdown yet are leaked and will not
+ * block shutdown.
+ *
+ * This method should only be used at during shutdown to cleanup threads that
+ * made blocking calls to code outside our control, and can't be safely
+ * terminated. We choose to leak them intentionally to avoid a shutdown hang.
+ */
+ [noscript] void shutdownWithTimeout(in long aTimeoutMs);
+
+ /**
+ * Get/set the maximum number of threads allowed at one time in this pool.
+ */
+ attribute unsigned long threadLimit;
+
+ /**
+ * Get/set the maximum number of idle threads kept alive.
+ */
+ attribute unsigned long idleThreadLimit;
+
+ /**
+ * Get/set the amount of time in milliseconds before an idle thread is
+ * destroyed.
+ */
+ attribute unsigned long idleThreadTimeout;
+
+ /**
+ * If set to true the idle timeout will be calculated as idleThreadTimeout
+ * divideded by the number of idle threads at the moment. This may help
+ * save memory allocations but still keep reasonable amount of idle threads.
+ * Default is false, use |idleThreadTimeout| for all threads.
+ */
+ attribute boolean idleThreadTimeoutRegressive;
+
+ /**
+ * Get/set the number of bytes reserved for the stack of all threads in
+ * the pool. By default this is nsIThreadManager::DEFAULT_STACK_SIZE.
+ */
+ attribute unsigned long threadStackSize;
+
+ /**
+ * An optional listener that will be notified when a thread is created or
+ * destroyed in the course of the thread pool's operation.
+ *
+ * A listener will only receive notifications about threads created after the
+ * listener is set so it is recommended that the consumer set the listener
+ * before dispatching the first event. A listener that receives an
+ * onThreadCreated() notification is guaranteed to always receive the
+ * corresponding onThreadShuttingDown() notification.
+ *
+ * The thread pool takes ownership of the listener and releases it when the
+ * shutdown() method is called. Threads created after the listener is set will
+ * also take ownership of the listener so that the listener will be kept alive
+ * long enough to receive the guaranteed onThreadShuttingDown() notification.
+ */
+ attribute nsIThreadPoolListener listener;
+
+ /**
+ * Set the label for threads in the pool. All threads will be named
+ * "<aName> #<n>", where <n> is a serial number.
+ */
+ void setName(in ACString aName);
+};