Libevent Multithread Support

multithreading libevent
user109343 picture user109343 · Feb 5, 2012 · Viewed 8.7k times · Source

i have a few questions regarding libevent2 and its multithread support.

Does libevent support multiple Threads? What i would like to achieve is something like this:

  1. Create an event_base in a single thread.
    • In this single Thread setup events and associate them to the event base. Also register Callbacks for each observed event.
  2. As soon as an observed event occurs, execute the registered callback in some other (worker)thread.

Is it possible to do s.th like this with libevent? Or are there any other approaches to support multiple cores?

Thank you very much

Answer

kainan picture kainan · May 14, 2013

If you add evthread_use_pthreads(); you must have -levent_pthreads

Example:

gcc chat.c -o chat -levent -lpthread -levent_pthreads

and:

$> ls /usr/lib/libevent*.a
/usr/lib/libevent.a  /usr/lib/libevent_core.a  /usr/lib/libevent_extra.a  /usr/lib/libevent_openssl.a  /usr/lib/libevent_pthreads.a

Related questions

What is the difference between a process and a thread?

What is the technical difference between a process and a thread? I get the feeling a word like 'process' is overused and there are also hardware and software threads. How about light-weight processes in languages like Erlang? Is there a …

Read More
How can I use threading in Python?

I am trying to understand threading in Python. I've looked at the documentation and examples, but quite frankly, many examples are overly sophisticated and I'm having trouble understanding them. How do you clearly show tasks being divided for multi-threading?

Read More
Difference between wait() and sleep()

What is the difference between a wait() and sleep() in Threads? Is my understanding that a wait()-ing Thread is still in running mode and uses CPU cycles but a sleep()-ing does not consume any CPU cycles correct? Why …

Read More