RejectedSoftware Forums

On Mon, 13 Jul 2015 15:17:12 +0200, Sönke Ludwig wrote:

Do you have any more information?

After pressing Ctrl+C "Received signal 2. Shutting down." appears, but application seems continuing work - tasks do I/O and print logs.

Unfortunately, I can't reproduce that behaviour on a simple project.

I found the reason. Look at this funny code

import vibe.d;
import std.stdio;

void main() {
  runTask({
    while(true) {
      sleep(5.seconds);
      logInfo("working");
    }
  }).join;
  // this point will never be reached
  runEventLoop();
}

After pressing Ctrl+C we exit to console, but program continues working in background like daemon.

Workaround is simple - don't use join() before running event loop:

import vibe.d;
import std.stdio;

void main() {
  runTask({
    runTask({
      while(true) {
        sleep(5.seconds);
        logInfo("working");
      }
    }).join;
  });
  runEventLoop();
}

But that daemonization looks strange.

Am 14.07.2015 um 11:37 schrieb Jack Applegame:

I found the reason. Look at this funny code

import vibe.d;
import std.stdio;

void main() {
   runTask({
     while(true) {
       sleep(5.seconds);
       logInfo("working");
     }
   }).join;
   // this point will never be reached
   runEventLoop();
}

After pressing Ctrl+C we exit to console, but program continues working in background like daemon.

Does it also continue after pressing Ctrl+C twice in that case? I'm not
sure about Linux now, but on Windows, although the keyboard input is
back to the command interpreter, a Ctrl+C will still go to the old process.

Workaround is simple - don't use join() before running event loop:

import vibe.d;
import std.stdio;

void main() {
   runTask({
     runTask({
       while(true) {
         sleep(5.seconds);
         logInfo("working");
       }
     }).join;
   });
   runEventLoop();
}

But that daemonization looks strange.

It behaved like that as long as I remember. I simply assumed that this
behavior is somehow specific to the console, but maybe I'm just doing
something stupid in the signal handler...