org.jboss.threads.EnhancedQueueExecutorBase5 Maven / Gradle / Ivy
/*
* JBoss, Home of Professional Open Source.
* Copyright 2018, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.threads;
import static org.jboss.threads.JBossExecutors.unsafe;
/**
* EQE base: thread status
*/
abstract class EnhancedQueueExecutorBase5 extends EnhancedQueueExecutorBase4 {
static final long threadStatusOffset;
static {
try {
threadStatusOffset = unsafe.objectFieldOffset(EnhancedQueueExecutorBase5.class.getDeclaredField("threadStatus"));
} catch (NoSuchFieldException e) {
throw new NoSuchFieldError(e.getMessage());
}
}
// =======================================================
// Current state fields
// =======================================================
/**
* Active consumers:
*
* - Bit 00..19: current number of running threads
* - Bit 20..39: core pool size
* - Bit 40..59: maximum pool size
* - Bit 60: 1 = allow core thread timeout; 0 = disallow core thread timeout
* - Bit 61: 1 = shutdown requested; 0 = shutdown not requested
* - Bit 62: 1 = shutdown task interrupt requested; 0 = interrupt not requested
* - Bit 63: 1 = shutdown complete; 0 = shutdown not complete
*
*/
@SuppressWarnings("unused") // used by field updater
volatile long threadStatus;
EnhancedQueueExecutorBase5() {
super();
}
// =======================================================
// Compare-and-set operations
// =======================================================
boolean compareAndSetThreadStatus(final long expect, final long update) {
return unsafe.compareAndSwapLong(this, threadStatusOffset, expect, update);
}
}