ROS Resources: Documentation | Support | Discussion Forum | Index | Service Status | ros @ Robotics Stack Exchange

Attention: Answers.ros.org is deprecated as of August the 11th, 2023. Please visit robotics.stackexchange.com to ask a new question. This site will remain online in read-only mode during the transition and into the foreseeable future. Selected questions and answers have been migrated, and redirects have been put in place to direct users to the corresponding questions on Robotics Stack Exchange. Additional details are available here.

4

Throwing out recursive print.

print

asked 2011-06-20 07:55:54 -0600

flag of United States of America

347 ●13 ●19 ●32 https://ubuntuslave.github.io/

Why am I getting this after pressing "Ctrl+C"?

Warning: recursive print statement has occurred. Throwing out recursive print.

Warning: recursive print statement has occurred. Throwing out recursive print.

forever

I can't stop it!

edit retag flag offensive close merge delete

Comments

I have seen this being discussed (and fixed) for nodelets, but for me it happens also for regular nodes. Quick Fix: Ctrl+Z to send process to background, Then "kill %1" to kill the background process.

Felix Endres ( 2011-06-20 08:30:21 -0600 )edit

Even quicker fix: CTRLl-\ to directly send a sigkill.

Lorenz ( 2011-06-20 20:33:33 -0600 )edit

nice, didn't know that :-)

Felix Endres ( 2011-06-20 23:45:35 -0600 )edit

2 Answers

Sort by » oldest newest most voted

0

answered 2011-06-20 21:58:50 -0600

Martin Günther

flag of Germany

11816 ●82 ●159 ●198 https://www.dfki.de/en...

Perhaps you don't check for ros::ok()? If you don't, then Ctrl-C won't kill your node.

edit flag offensive delete link

Comments

I have the problem too. I'm using the multithreaded spinner (but I think I also had it with other spinners), so I'm just calling spin(), which should to the ros::ok check, shouldn't it?

Felix Endres ( 2011-06-20 23:45:20 -0600 )edit

Yes, spin() does the ros::ok() check.

Martin Günther ( 2011-06-21 00:00:19 -0600 )edit

0

answered 2011-06-20 20:23:00 -0600

flag of Germany

31395 ●134 ●284 ●498

Maybe you have a while (ros::ok()) loop and some ROS_INFO... like printouts after that? (so ROS_INFO... is called, when ros::ok() is false).

edit flag offensive delete link

Comments

With that advice in mind, is this wrong? [code] while (ros::ok()) { // do whatever } ROS_WARN("No longer looping!");

ubuntuslave ( 2011-07-16 05:04:43 -0600 )edit

Also, How the hell can someone post codes inside comments???

ubuntuslave ( 2011-07-16 05:07:26 -0600 )edit

I would say: That shouldn't work (but it's easy to test). ROS_WARN would try to contact rosout, but at that time ros::ok() is false.

dornhege ( 2011-07-16 05:27:05 -0600 )edit

Question Tools

1 follower

Stats

Asked: 2011-06-20 07:55:54 -0600

Seen: 465 times

Last updated: Jun 20 '11

Related questions

ROS Answers is licensed under Creative Commons Attribution 3.0 Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.

Powered by Askbot version 0.10.2