I'm relatively new to Threading in Java and I've noticed that everytime I use Thread.sleep() I have to catch InterrupetdException.
What kind of behaviour causes this, and in simple applications where I ... |
I want to launch a process from Java, read its output, and get its return code. But while it's executing, I want to be able to cancel it. I start out ... |
I would like to somehow log every time Thread.interrupt() is called, logging which Thread issued the call (and its current stack) as well as identifying information about which Thread is being ... |
Consider some code that calls, say,
file = new RandomAccessFile(x, "r");
file.getChannel().map(....)
and wants to handle a ClosedByInterruptException circumstance. I'm stumped by how to make a realistic, repeatable unit test.
To make ... |
Possible Duplicate: How do you kill a thread in Java?
I need to stop doing some big task by sending the interruption signal to the Thread. I am using most of ... |
I have a semaphore which restricts users to download n number of files at a time. Each file is downloaded in a separate thread.
EDIT: Modified the example so that the release ... |
I am using the Javamail API connecting to my IMAP server. Everything is working great with the javax.mail.Folder.idle() method. My listener gets called when a new mail comes in. ... |
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This is a modification of code from the Java tutorial on Concurrency
package threads;
public class SimpleThreads {
static void threadMessage(String msg) {
String threadName = Thread.currentThread().getName();
System.out.format("%s: %s%n", threadName,msg);
}
...
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I am running a thread whose main action is to call on a proxy using a blocking function , and wait for it to give it something.
I've used the known ... |
I am using a text file to store the serial port output. And now I want to put the contents of the file to an textArea in java. I have created ... |
Java question: As far as I know, there are two ways to check inside a thread whether the thread received an interrupt signal, Thread.interrupted() and Thread.isInterrupted(), and the only difference between ... |
My scenario is as follows:
I am implementing a server that must timeout or produce a response within the specified timeout period for each request. Thus each request is ensured a response ... |
The following program demonstrates the problem (latest JVM & whatnot):
public static void main(String[] args) throws InterruptedException {
// if this is true, both interrupted and isInterrupted work
...
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A teammate made the following claim: "Thread.interrupt() is inherently broken, and should (almost) never be used". I am trying to understand why this is the case.
Is it a known best practice ... |
I have a bunch of procedures that need to be executed successively until either they are all executed, or a certain condition is met. Here's the basic code that needs to ... |
I've read and re-read Java Concurrency in Practice, I've read several threads here on the subject, I've read the IBM article Dealing with InterruptedException and yet there's something I'm ... |
trying to figure out some behavior. I've got some code that spawns one thread. It waits some amount of time, and then interrupts it, joins it and then exits the method. ... |
When an Thread.interrupt() is called on some thread, what happens to that thread?
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I have a short version of the question:
- I start a thread like that:
counter.start();, where counter is a thread.
- At the point when I want to stop the thread I do that: ...
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This is a short question. At some point my thread understand that it should suicide. What is the best way to do it:
- Thread.currentThread().interrupt();
- return;
By the way, why in the first case we ... |
If a thread is interrupted while inside Object.wait() or Thread.join(), it throws an InterruptedException, which resets the thread's interrupted status. I. e., if I have a loop like this inside a ... |
I am trying to set up a method inside a class that implements the runnable interface that will set the interrupt status of that class. The reason i want to be ... |
I have a method which, conceptually, looks something like:
Object f(Object o1) {
Object o2 = longProcess1(o1);
Object o3 = longProcess2(o2);
return longProcess3(o3);
}
Where ... |
Could you explain me what does this function do when invoked?
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I am trying to read input from a socket line by line in multiple threads. How can I interrupt readLine() so that I can gracefully stop the thread that it's ... |
I would like to stop a thread in mid execution. From reading around, I am of the thought I will have to check a local variable to determine if the ... |
I'm using RXTX to read data from a serial port. The reading is done within a thread spawned in the following manner:
CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier(port);
CommPort comm = portIdentifier.open("Whatever", 2000);
SerialPort serial ...
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I am developing an application where every TimeMax_Sec seconds a complex function (optimisation) is run. The function can potentially enter in a loop or just to take too much time, and ... |
Possible Duplicate:
Interrupting or stopping a sleeping thread
How to stop or interrupt a sleeping thread in java.? I have a thread that syncs data and ... |
I have a Java application that I CAN'T EDIT that starts a Thread wich has this run method:
public void run(){
while(true){
System.out.println("Something");
}
}
And ... |
I have Ant build and execute a java program. This program tries to do something that sometimes hangs, so we execute it in a thread.
actionThread.start();
try {
actionThread.join(10000);
} ...
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When I revise some old code, I came across.
public void stop() {
if (this.simulationThread != null) {
this.simulationThread.interrupt();
...
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Thanks for all the help and support , I am facing a problem where by i have two threads one is a Timer thread , and another one is some File ... |
The official Sun Oracle stance on Thread.stop() is that it should not be used. Among other arguments, they write:
It should be noted that in all situations where ... |
Hy everyone!
I have a Thread who updates a view over the Observer Pattern. The update is working well, but the problem is that the interrupt doesn't work. Please help.
Main:
public class ...
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It is a widely known fact that one shall not stop running processes using Thread.stop().
Usually the manuals and tutorials suggest using Thread.interrupt() or some boolean variable instead, and checking from ... |
I have an alarm that will play a sound at a specific time. I'm looking for a way to stop it from running, how can I do it?
This is my alarm's ... |
I'm trying to understand how threads work in Java and currently investigating how to implement looped threads that can be cancelled. Here's the code:
public static void main(String[] args) throws Exception {
...
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Trying to interrupt a running thread, in this example, t1, which is executed by a thread in a thread pool.
t2 is the one that sends the interrupt.
I'm unable to stop the ... |
I was reading some java thread interruption and I don't understand some stuff. Hope someone will explain me. So, it's done the following code
public Integer getInteger(BlockingQueue<Integer> queue) {
...
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I'm trying to write some code that performs a wait via JNA (e.g. by calling the Kernel32 function WaitForSingleObject), but I'd also like the wait to finish if Thread.interrupt() is called; ... |
If run() hasen't finished and is recalled from outside I need to finish the running shread first.
public class EnvTime extends Thread {
public void run() {
...
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I am trying to interrupt a thread that is running AES encryption on a file. That can take a while, so far I have come up with this.
This body is ... |
Let's assume thread t1 is running (i.e. not in a sleep, wait or join state). Another thread t2 interrupts t1. The Javadoc says t1's interrupted status will be set.
Let's assume t1 ... |
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I read Maha Anna's nice explanation about how interrupt() acts on waiting threads & non-waiting threads. In the latter case Maha explained that interrupt() can be used for stopping a thread. But I could not understand one thing. Maha says that stopper-thread must set a boolean hastoDie variable to true. And then the stopper-thread must send an interrupt() to the target-thread, ... |
My answer would be yes. If thread B is sleeping or waiting then It would throw InterruptedException. If it is blocking for I/O then the Interrupted Exception may not be thrown,which is the case with even same priority threads. If B is running, then A is not. However B may yield and let A run and if A calls interrupt(), then ... |
Hi ALL I am relatively new to Threads. What does the method interrupt() do to a Thread ?? Is this a static method ?? How and Why would you use this method ?? Prompt reply will be highly appreciated as this is Urgent. Thanks in advance. [ July 26, 2006: Message edited by: Jim Yingst ] |
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While i was reading dicussion threads in this forum , i came across one statement : Calls to interrupt() are stored i.e. if interrupt() is called on a thread which is not blocked by sleep, wait, join etc. and doing something else, then it will continue with the work. When the thread, on which interrupt () was called, calls any of ... |
I have a thread processing task by task in the run method while(running) { Task = getTask(); porcess(task); } Sometimes (like process running too much) I might want to stop a running task and make the thread skip to the next one. What's the best solution ? (without creating a new 'clone') Do application servers provide such a feature for an ... |
I was hoping someone could clear something up for me. I am still not entirely sure what the interrupt method of Thread DOES. I have read that it should be used to replace the deprecated stop() method. So that makes it seem like the interrupt kills another thread. But then I also have read that a Sleeping Thread that recieves an ... |
Have you tried to use 'setSoTimeout'? It interrupts accept() when timeout expires. Then you can decide if you want to finish or not. Is like an active wait ... but I don't know if there is a better solution. I have never programmed with sockets in Java, but I think it can work ... |
Well, for a start Thread.interrupted() is a static method that always works on the current thread - your calls merely test if the main thread is interrupted, which it isn't. To do what you want to do, you'd need to use the isInterrupted() method. But that wouldn't work either. The interrupted flag indicates that a thread has been interrupted but the ... |
Hi, The main thread of server sets the status to IDLE and then it starts another thread (child thread). Now the main thread is waiting for client connection (by calling Socket.accept()method). In the mean time, the child thread sets the server status to STOPPING due to the request it received. Now the server main thread should not continue waiting for the ... |
Hi, I've got a program in which I need to interrupt a number of threads, reset a variable in the class in which the threads are running, and then restart all of the threads at the point which they were interrupted. I've worked around it using one of Doug Lea's util.concurrent classes but I've been searching high and low for some ... |
Hi! Can anyone tell me what does interrupt() method do and is it actually called to interrupt the same thread that it is called upon, for example if i call : first.interrupt(); then will it interrupt the same thread i.e first that i have called it upon ? if not what will it do ? . And one more thing when ... |
Hi, Does any one know under which circumstances, if any, the java.lang.Thread.interrupt() method would not return? I thought this would never happen but it's actually happening in our code. Basically, our main thread in the program calls the interrupt() method of the other user threads that are also executing before terminating the application. The main thread does not continue with its ... |
I don't have my copy of the Passport book with me right now to investigate, but the text in the form you show it is wrong. Either there's an error in the book, or you've misquoted. (What's in the "..." sections though? I can imagine several things that could go there which would change the meaning, so perhaps you should show ... |
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Hi, My first post here, yay! I'm writing a news ticker for Stunning-Stuff.com for other peeps to put on their web site. Everything is working until now . My problem is that I'm using threads for the first time and don't know how to resume a sleeping thread. I want to interrupt it's sleep when I mouse over the applet. After ... |
Dear all, I just have one simple Q about thread.interrupt(). I wonder what thread.interrupt() really does in the java program. from the name, I guess it is used when we would like to interupt the thread excution. But when I read some meterial in the internet, it is said it wakes the thread up(Wake up a sleeping thread or blocked thread). ... |
I have the following small method in my code. spt is a thread. Why doesn't isInterrupted() always return true? It always prints "false". Rebecca public void stopSegment( ) { if (segmentPlaying){ segmentTimer.stop( ); segmentLine.stop(); segmentLine.flush(); segmentLine.close(); spt.interrupt(); boolean interrupted = spt.isInterrupted(); spt = null; System.out.println("Spt is interrupted is " + interrupted); segmentPlaying = false; } } |
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Hi, I am currently working with threads and I've just read the Javadoc of "Thread.interrupt()" and it's written: [If this thread is blocked in an invocation of the wait(), wait(long), or wait(long, int) methods of the Object class, or of the join(), join(long), join(long, int), sleep(long), or sleep(long, int), methods of this class, then its interrupt status will be cleared and ... |
Well, at first sight, your main method seems to be executed in the "main" thread. You're not interrupting the main thread anywhere else in your code, therefore, I must say, in the context of the code that you posted, that your main method will never be interrupted. But you could interrupt you "main" thread from another thread, like this, for instance ... |
Actually, many people ignore the why of the matter: Depends on what your target user is. If the sole thread of execution, running both the user-interface and the program it's self, tries to open a socket or something that the operating system does not manage for the programmer - the mouse and everything else for that program is hung. To the ... |
Not quite. No thread can be interrupted unless it wants to be. You can have your base thread constantly check for isInterrupted(). That doesn't tell you anything about who did it or why you've been interrupted. You can have a variable in the base thread that another thread sets (in a sync method or statement) and have your base thread constantly ... |
Hi there. I have a program consisting of 4 classes at the moment: MainProgram.java class FileProcessor.java class FileCreator.java class ServerCommands.java class The MainProgram class provides an interface where somebody can input a file name and press a button 'Go'. This file name is then passed to the FileProcessor. The FileProcessor class interprets the data in the user input file and passes ... |
Hi. I have a main class coded in Netbeans. It codes for a GUI. It has a button on it which when I press invokes the following code: private void myButtonActionPerformed(java.awt.event.ActionEvent evt) { ThreadClass thisThread = new ThreadClass(); Thread myThread = new Thread(thisThread); myThread.start(); } Where the ThreadClass is a class containing the code: import java.lang.Thread; public class ThreadClass implements Runnable{ ... |
OK, but the question ( hoping not to get too far away from original posters needs ) is that a read() on System.in would block, not be interruptible and then ( conceivably ) make exiting the system sluggish or possbly error prone. I stll have to learn to code with channels, even though our discussion on this occured almost a year ... |
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Hi ALL What does the interrupt() method do when you call it on a Thread ?? Is is a Static method, how would you use it ?? Can I confirm with someone that A thead has 4 main states ehich are Running, Ready, Dead and Waiting. The Waiting state contains Blocking and Sleeping. Is this correct. Prompt reply would be Greatly ... |
hello, I often see this code construct in the java app that I have inherited. It's an application full of threaded operation but I havent seriously work on such type of app so I have my doubt on the following hilited code.. class MyThread extends Thread { public boolean bEndThread = false; public MyThread (String strName) { super(strName); } synchronized public ... |
Hi Folks, can any one suggest me some thing....I am running a thread using start () method which in turn calls the run() method of runnable object . Inside run() I am executing a very long running sql query....Now suddenly I need to stop the query /stop the thread...how can I do this from out side the thread that is executing ... |
Hi I am preparing for SCJP exam and came across this question in Devaka exam.Could somebody please explain why the user thread is not interrupted even though main thread set the interrupt when the user thread is sleeping? I see the output as Ex-B followed by exception.Why not Ex-A is not printed?Why the interrupt method not woking here? public class A ... |
Hi. I use a ThreadPoolExecutor that executes some runnable on 10 threads. the code that has been executed is read some information from a socket server. At some times I want a specific thread to be terminated so I use Thread.interrupt and it work in 90% of the cases. I know because afterExecute(Runnable run, Throwable t) method from the ThreadPoolExecutor is ... |
Leandro, To address your question about the usefulness of the Thread.interrupted() method - I think you have a problem with it because it checks the current thread to see if it is interrupted. I guess you think there is a problem with that because if the Thread is interrupted how could it be executing to the point where it would be ... |
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I am facing strange behavior (not as per spec) In my test application I have to create some number of threads which will do some database transaction. To manage these threads I am using a thread group. to close the threads I have used the Thread.isInterrupted() flag i.e. they check in a loop for this flag and if it is set ... |
Interrupt is used to safely signal a Thread that it should stop (or at least interrupt) what it is doing. Calling the interrupt() method does not change the state of the Thread, it sets a flag to tell the Thread it has been interrupted. Certain API will respond to interrupts with an InterruptedException, things like wait() and Thread.sleep(). Others will not ... |
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The only safe way to stop another Thread is to have a signal between all concerned Threads, and have all of the Threads periodically check that signal. One very common signal is the 'interrupted' flag. The Thread which wants to stop the others calls otherThread.interrupt() on each of the other Threads. The ones which need to respond check the interrupt status ... |
I am running multiple threads (Assume Thread1,Thread2,Thread3) for doing single operation.If any one of the threads done that operation(Thread2) then the remaining threads(Thread1,Thread3) will stop suddenly. please guide me how to kill that remaining threads suddenly.I don't know how to stop it suddenly.(Marked in red color). Ex: import java.util.Random; class RandomGenerator implements Runnable{ public void run(){ random(); } public void random(){ ... |
private static class MessageLoop implements Runnable { public void run() { String importantInfo[] = { "Mares eat oats", "Does eat oats", "Little lambs eat ivy", "A kid will eat ivy too" }; try { for (int i = 0; i < importantInfo.length; i++) { //Pause for 4 seconds Thread.sleep(4000); //Print a message threadMessage(importantInfo[i]); } } catch (InterruptedException e) { threadMessage("I wasn't ... |
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Hi, We have a custom Servlet Engine (Similar to Tomcat) which has configurable numbers of "Worker Threads" to handle HTTP request. The issues here is, this engine hangs if the "Worker Threads" are BLOCKED for long time. So I wanted to interrupt these "Worket Threads". When I took the thread dump with "jstack " will give the all the Worker Thread's ... |
import java.util.logging.Level; import java.util.logging.Logger; public class mainBot extends Thread { public int allDone; public int active = 1; String msg; @Override public void run() { while (active == 1) { mainRun(); try { Thread.sleep(1000); } catch (InterruptedException ex) { Logger.getLogger(mainBot.class.getName()).log(Level.SEVERE, null, ex); } System.out.println(allDone); if(allDone == 1) { System.out.println("yes"); return; } else { System.out.println(allDone); } System.out.println(allDone); } } public void mainRun() ... |
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I'm trying to understand how threads are interrupted. In particular, if I have to poll Thread.currentThread().isInterrupted() in a long running task. I find I'm not able to write a simple test that I can't interrupt. If I run the following in a bash shell, and type CTRL_C, it exits. By what mechanism does it exit? public static void main(String[] args) { ... |
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Hi there . I running a multi-threaded java program , over ten threads work simultaneously , while the program running some of these threads are in sleep mode and some of them are running based on some conditions , my question is how can I reach and wake a specific thread among all the sleeps threads, like if my threads names ... |
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Hello every I have got problem. My class MyClass is extend from one class PaternClass. This pattern creates and start inner thread in onw constructor. Note that the thread is user thread and not daemon and serves for repeating of some operations. Constructor of patern is called in constuctor of class MyClass what means the mentioned thread is created. But I ... |
I am using a block mode receive(ByteBuffer) of DatagramChannel in a thread. After running the interrupt() to interrupt this thread, the datagram channel can not be unblocked and the thread is still in running. I traced the code to java.nio.channels.spi.AbstractInterruptibleChannel and found this method: protected final void begin() { if (interruptor == null) { interruptor = new Interruptible() { public void ... |
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How do I create a timer that will interrupt a thread? I need to put this timer inside the thread, and I should be able to manipulate the time. I have managed to create an inner class that act as the timer. But, I can't make the timer to interrupt the main thread. Can anyone help me? Is there any simpler ... |