116 lines
3.3 KiB
Haxe
116 lines
3.3 KiB
Haxe
/*
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* Copyright (C)2005-2019 Haxe Foundation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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package sys.thread;
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#if (!target.threaded)
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#error "This class is not available on this target"
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#end
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import haxe.Exception;
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/**
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Thread pool with a constant amount of threads.
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Threads in the pool will exist until the pool is explicitly shut down.
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**/
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@:coreApi
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class FixedThreadPool implements IThreadPool {
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/* Amount of threads in this pool. */
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public var threadsCount(get,null):Int;
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function get_threadsCount():Int return threadsCount;
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/** Indicates if `shutdown` method of this pool has been called. */
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public var isShutdown(get,never):Bool;
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var _isShutdown = false;
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function get_isShutdown():Bool return _isShutdown;
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final pool:Array<Worker>;
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final poolMutex = new Mutex();
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final queue = new Deque<()->Void>();
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/**
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Create a new thread pool with `threadsCount` threads.
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**/
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public function new(threadsCount:Int):Void {
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if(threadsCount < 1)
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throw new ThreadPoolException('FixedThreadPool needs threadsCount to be at least 1.');
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this.threadsCount = threadsCount;
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pool = [for(i in 0...threadsCount) new Worker(queue)];
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}
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/**
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Submit a task to run in a thread.
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Throws an exception if the pool is shut down.
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**/
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public function run(task:()->Void):Void {
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if(_isShutdown)
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throw new ThreadPoolException('Task is rejected. Thread pool is shut down.');
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if(task == null)
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throw new ThreadPoolException('Task to run must not be null.');
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queue.add(task);
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}
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/**
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Initiates a shutdown.
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All previousely submitted tasks will be executed, but no new tasks will
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be accepted.
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Multiple calls to this method have no effect.
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**/
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public function shutdown():Void {
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if(_isShutdown) return;
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_isShutdown = true;
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for(_ in pool) {
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queue.add(shutdownTask);
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}
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}
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static function shutdownTask():Void {
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throw new ShutdownException('');
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}
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}
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private class ShutdownException extends Exception {}
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private class Worker {
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var thread:Thread;
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final queue:Deque<Null<()->Void>>;
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public function new(queue:Deque<Null<()->Void>>) {
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this.queue = queue;
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thread = Thread.create(loop);
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}
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function loop() {
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try {
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while(true) {
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var task = queue.pop(true);
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task();
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}
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} catch(_:ShutdownException) {
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} catch(e) {
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thread = Thread.create(loop);
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throw e;
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}
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}
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} |