Questions tagged [threads]
The threads tag has no usage guidance.
22
questions
0
votes
1
answer
5
views
Executors do not spin correctly when launched separately
Hello,
I would like to build a modular package in which you can model some ROS systems using YAML files.
You can find the github repository here:
https://github.com/HarunTeper/ros_system_model
However,...
HarunTeper
0
votes
1
answer
2
views
Thread related problem while subscribing/using data
Hi,
I've been debugging my code recently and I've encountered this strange value assignments in my code (e.g. double value was set to ...
l4ncelot
0
votes
1
answer
2
views
Error: Threads Multiple Definition of
I have two GUI exactly the same except a few alterations. I copy-paste the code and changed only the node.
Code:
...
Geaper
0
votes
1
answer
1
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Multiple launchs in terminal
Hi!
I'm running experiments in my project using turtlebot and kinect but i'd like to improve the speed of that by launching all the .launch files once for each experiment. Is that possible?
For ...
Phelipe
0
votes
1
answer
4
views
how are threads used to service callbacks in nodelets?
I have several nodelets, each subscribes to different messages (using the single threaded node handle). However, I realized one of my nodes, which subscribes to images and to odometry messages, and ...
Matias
0
votes
2
answers
5
views
Independently change angular and linear velocities (cmd_vel)
Hi people!
This is really an easy question for the experts:
I am coding some roslisp/cram functions where I would like to change independently the angular and linear velocity of my robot in parallel ...
LovedByJesus
0
votes
2
answers
1
view
Dynamic information flow between ROSJAVA nodes and ROSActivity
Hi All,
When using ROSJAVA with android I'd like to pass information from the ROSActivity gui to the ros_node implementing nodeMain. Is there a way to do this without using the normal ROS message ...
PeterMilani
0
votes
1
answer
1
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Using Actionlib for publishing force data in ROS
Hello All!
So here is what I want to implement, in a simple list format
I want to have a topic which publishes data from my force sensor (serial) onto the network constantly.
I want to have a ...
Nishant
0
votes
1
answer
11
views
Spawning multiple Action Clients from one node
Hi All,
I am creating several action server nodes to cater to different kinds of Actions that I need to perform. However, I find it inefficient to create 'n' Action Clients for the 'n' # of Action ...
Ammar
0
votes
1
answer
12
views
Publishing and subscribing to a topic in different threads
Hi all!
I was just curious about this, before I actually sit for coding.
Suppose I have a thread in which I am publishing to a topic. Then, can I subscribe
to that same topic from some different ...
Nishant
0
votes
1
answer
1
view
How to avoid/manage process/thread starvation?
Short version: how to keep one (cpu bound) node from starving all other nodes without explicit sleep()?
I have a system in which one node (in particular) is a cpu ...
ipso
0
votes
1
answer
3
views
Calling ros::spinOnce() in nodelets?
Is it possible to integrate a while(true){ros::spinOnce(); ..} loop into a nodelet? I've based mine on the velodyne_driver nodelet, which runs a separate thread ...
ipso
0
votes
1
answer
4
views
Threading function - udp client integration to a Ros node
Hi,
I have working ROS node with callBacks for subscriptions, and also with timers like this:
...
ajr_
0
votes
2
answers
1
view
ros::ok() within pthread
I am have a couple of threads that run in a node. The threads have a while(ros::ok()) infinite loop inside. The problem is that when I Ctrl-C my program, it has to escalate to a SIGTERM because the ...
rplankenhorn
0
votes
1
answer
1
view
Execute loops in multiple nodes at the same time?
Hello,
I have a system that has two ROS nodes, each with a while loop that waits for a certain amount of time to pass. However, when the first node enters its loop, the rest of the system freezes ...
gavinmachine
0
votes
1
answer
1
view
programmatically killing Subscriber in another thread (ROSJAVA)
The title says it all. I have a subscriber in a separate runnable thread from my main program. When I close my main program, I want to kill the subscriber thread, but calling the stop() method below ...
morrowsend
0
votes
2
answers
1
view
Running ROSJAVA as a thread in a larger app
How might the ROSJAVA talker example be spawned as a separate thread since it must be passed the NodeConfiguration at startup? I get an error stating that I cannot cast my main file to org.ros.node....
morrowsend
0
votes
2
answers
7
views
How to spawn multiple nodes in same C++ process
Hello there,
I want to spawn multiple nodes within the same C++ process. To this end I used boost/thread. All seems to work, except that always one of the nodes is not showing up in 'rosnode list'.
...
nitschej
0
votes
2
answers
20
views
Multiple Threads in Single ROS Node
What is the preferred threading library to use when trying to write a ROS node with multiple threads? Boost::Thread ? Posix ? Pthreads ?
Are there any issues with callback functions when multiple ...
SyllogismRXS
0
votes
1
answer
67
views
What "escalating to SIGTERM" mean?
Hi everyone !
I have develop my on keyboard to start doing a teleoperation, to read the keys I have created a thread and and i have a ros::rate to publish my data in other frequency. But when I kill ...
Catotaku
0
votes
2
answers
1
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How much can I control ROS real-time behavior?
Hello all,
I'm quite new on ROS and I've a question which answer could not find in the web.
The question is originated by this phrase: "ROS is not a realtime framework, though it is possible to ...
dantard
0
votes
1
answer
5
views
is ros client c++ code thread safe?
Can I initialize and run the ros C++ client code in it's own thread?
I'm thinking of creating a thread, and in the thread initializing ROS, then having my main loop run there.
I can't see why not, but ...
SeanPayne