Update Files

Kha/Tools/linux_x64/std/sys/thread/FixedThreadPool.hx

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