[Playerstage-users] How to implement a multi-thread or multi-process system with player?

[chyujian <iam...@gm...>]

hi, guys

weeks ago i tried to build a multi-thread using pthread to work with
player, in detail, i sent one of the sub-thread to retrieve sensor datas
from player and report them to the decision-making thread, but failed.

however, i really need a multi-thread or multi-process model to
designate different component different missions, like, the
walker-thread is only dedicated to implement the pre-fixed walk action,
meanwhile the sonar-monitor-thread is constantly watching the obstacles
around, once somebody put a stake in front of the robot suddenly, the
sonar-monitor-thread is expected to send an instant message directly to
the walk-thread to force the walk-thread to abort its current walking
mission and turn around immediately to protect the robot itself.

i checked the palyer docs about multi-thread or process programming, but
i didn't quite understand the description about boost signals and thread
in the libplayerc++'s document. could anybody tell me weather is it the
internal mechanism inside the player or some kind of multi-thread
accessibility offered to us that mentioned in the libplayerc++'s
documentation?