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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"
[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
{
/**
* 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);
};
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