CODEWITHSUNDEEP
c#multithreadingsuspend
sanchop22
sanchop22

Reputation: 2809

Alternative to Thread.Suspend() method

Thread.Suspend() method is obsolete as you know. I want to suspend thread immidiately when button click event comes. I used Thread.Suspend() and it works perfect but everyone suggest that using Thread.Suspend() method is not a good method to suspend the task. I used a flag to suspend the task but every time when a button click event comes, i have to wait to exit from task. I used Thread.IsAlive flag to wait the thread to exit but this method freezes form.

void ButtonClickEvent(object sender, ButtonClickEventArgs e)
{
    TheadExitFlag = false;

    if(MyThread != null)
    {
        while(MyThread.IsAlive);
        //MyThread.Suspend();
    }
}

void MyTask(void)
{
    while(TheadExitFlag)
    {
        // some process
        Thread.Sleep(5000);
    }
}

How can i suspend the thread immidiately?

Upvotes: 3

Views: 4082

Answers (3)

zafar142003
zafar142003

Reputation: 2149

There is an approximate solution to this problem at https://stackoverflow.com/a/45786529/3013473 using AspectJ and wait/notify.

Upvotes: 0

Brian Gideon
Brian Gideon

Reputation: 48949

Use a ManualResetEvent to toggle between a running and idle state.

ManualResetEvent run = new ManualResetEvent(true);

void ResumeButton_Click(object sender, ButtonClickEventArgs e)
{
  run.Set();
  PauseButton.Enabled = true;
  ResumeButton.Enabled = false;
}

void PauseButton_Click(object sender, ButtonClickEventArgs e)
{
  run.Reset();
  PauseButton.Enabled = false;
  ResumeButton.Enabled = true;
}

void MyTask(void)
{
    while (run.WaitOne())  // Wait for the run signal.
    {
      // Do work here.
    }
}

Upvotes: 4

Martin James
Martin James

Reputation: 24847

There is no alternative with the same functionality, AFAIK. I am not sure if the problems with an OS Suspend() could be worked around within the language/libraries, but no attempt has been made to do so, so maybe it's too difficult or even sensibly impossible.

Until such an alernative exists, you are reduced to polling for a suspend flag and then waiting on some synchronization object for a 'resume' signal. I have used AutoResetEvent for this.

Upvotes: 4

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