[
http://jira.qos.ch/browse/LBCORE-63?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ceki Gulcu moved LBCLASSIC-35 to LBCORE-63:
-------------------------------------------
Project: logback-core (was: logback-classic)
Key: LBCORE-63 (was: LBCLASSIC-35)
Component/s: (was: Other)
Affects Version/s: 0.9.9
(was: unspecified)
> Deadlock when running on multiple core processors
> -------------------------------------------------
>
> Key: LBCORE-63
> URL: http://jira.qos.ch/browse/LBCORE-63
> Project: logback-core
> Issue Type: Bug
> Affects Versions: 0.9.9
> Environment: Operating System: Windows
> Platform: PC
> Reporter: Toni Heimala
> Assignee: Ceki Gulcu
> Priority: Blocker
> Attachments: patch.txt, patch2.txt, patch3.txt
>
>
> When you run logging into same file from many threads on a system that has
> more than one physical processor (Dual Core for example), a deadlock will
> occur after a while. This can not be reproduced on HyperThreading processors.
> Here's an example program that will demonstrate the behavior:
> -----------------------------
> Main.java
> -----------------------------
> import java.util.Date;
> import java.util.concurrent.ScheduledThreadPoolExecutor;
> import java.util.concurrent.TimeUnit;
> import org.slf4j.Logger;
> import org.slf4j.LoggerFactory;
> import ch.qos.logback.classic.LoggerContext;
> import ch.qos.logback.classic.joran.JoranConfigurator;
> import ch.qos.logback.core.joran.spi.JoranException;
> public class Main extends Thread
> {
> private final static String LOGGER_CONFIGURATION_FILE = "logger.xml";
> private final Logger logger = LoggerFactory.getLogger(Main.class);
>
> private final long start;
>
> public Main()
> throws JoranException
> {
> start = new Date().getTime();
> LoggerContext lc = (LoggerContext)LoggerFactory.getILoggerFactory();
> JoranConfigurator configurator = new JoranConfigurator();
> lc.shutdownAndReset();
> configurator.setContext(lc);
> configurator.doConfigure(LOGGER_CONFIGURATION_FILE);
> }
>
> public void start()
> {
> ScheduledThreadPoolExecutor ex1 = new ScheduledThreadPoolExecutor(1);
> ScheduledThreadPoolExecutor ex2 = new ScheduledThreadPoolExecutor(1);
> ScheduledThreadPoolExecutor ex3 = new ScheduledThreadPoolExecutor(1);
> ScheduledThreadPoolExecutor ex4 = new ScheduledThreadPoolExecutor(1);
> ScheduledThreadPoolExecutor ex5 = new ScheduledThreadPoolExecutor(1);
> ex1.scheduleAtFixedRate(new Task("EX1"), 10, 10,
> TimeUnit.MICROSECONDS);
> ex2.scheduleAtFixedRate(new Task("EX2"), 10, 10,
> TimeUnit.MICROSECONDS);
> ex3.scheduleAtFixedRate(new Task("EX3"), 10, 10,
> TimeUnit.MICROSECONDS);
> ex4.scheduleAtFixedRate(new Task("EX4"), 10, 10,
> TimeUnit.MICROSECONDS);
> ex5.scheduleAtFixedRate(new Task("EX5"), 10, 10,
> TimeUnit.MICROSECONDS);
>
> super.start();
> }
>
> public void run()
> {
> try
> {
> while(true)
> {
> logger.debug("[MAIN] {}", new Date().getTime() - start);
> Thread.sleep(10);
> }
> }
> catch (InterruptedException e)
> {
> logger.info("[MAIN]: Interrupted: {}", e.getMessage());
> }
> }
>
> public static void main(String[] args)
> {
> try
> {
> Main main = new Main();
> main.start();
> }
> catch (JoranException e)
> {
> System.out.println("Failed to load application: " +
> e.getMessage());
> }
> }
> }
> -------------------------------
> Task.java
> -------------------------------
> import java.util.Date;
> import org.slf4j.Logger;
> import org.slf4j.LoggerFactory;
> public class Task implements Runnable
> {
> private final Logger logger = LoggerFactory.getLogger(Task.class);
> private final Logger logger_main = LoggerFactory.getLogger(Main.class);
> private final String name;
> private final long start;
>
> public Task(final String name)
> {
> this.name = name;
> start = new Date().getTime();
> }
> public void run()
> {
> logger.debug("[{}] {}", name, new Date().getTime() - start);
> logger_main.debug("[MAIN] - [{}] {}", name, new Date().getTime() -
> start);
> }
> }
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