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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;
import haxe.Timer;
import cs.Lib;
import cs.system.threading.ManualResetEvent;
class Lock {
final lockObj = {};
final releaseEvent = new ManualResetEvent(false);
var waitCount = 1; // initially locked
var releaseCount = 0;
public function new():Void {}
public function wait(?timeout:Float):Bool {
var myTicket;
// Get a ticket in queue
Lib.lock(lockObj, {
myTicket = waitCount;
waitCount++;
if (myTicket <= releaseCount) {
return true;
}
releaseEvent.Reset();
});
if (timeout == null) {
do {
releaseEvent.WaitOne();
if (myTicket <= releaseCount) {
return true;
}
} while (true);
} else {
var timeoutStamp = Timer.stamp() + timeout;
do {
var secondsLeft = timeoutStamp - Timer.stamp();
if (secondsLeft <= 0 || !releaseEvent.WaitOne(Std.int(secondsLeft * 1000))) {
// Timeout. Do not occupy a place in queue anymore
release();
return false;
}
if (myTicket <= releaseCount) {
return true;
}
} while (true);
}
}
public function release():Void {
Lib.lock(lockObj, {
releaseCount++;
releaseEvent.Set();
});
}
}
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