CODEWITHSUNDEEP
c++multithreadingpocodaemon
Aetf
Aetf

Reputation: 306

Multithread problems with Poco::ServerApplication

I'm using Poco::ServerApplication and Poco::TaskManager at the same time and encountered a wired problem.

If start without --daemon option, everything is ok. However when start with --daemon, the task passed to the taskmanager is never started. I debugged it with gdb and found that when with --daemon option, threads in the taskmanager's inner taskpool were started and soon stopped. So when calling TaskManager::start, it just uses an already finished thread and thus the task is never started.

I wonder if this is because of any restriction to a linux daemon, or is there anything else will cause this problem?

Here is the sample code which can reproduce the problem on my box.
http://codepaste.net/jhoyt5

Sorry for my poor English :P. And I would appreciate any ideas?

Upvotes: 1

Views: 1499

Answers (2)

Eric
Eric

Reputation: 1

I had this same Problem. I actually wasn't starting the threads in the constructor, but was creating the Poco::TaskManager container in the constructor. Once I created it in my main() everything worked.

Upvotes: 0

Lyyras
Lyyras

Reputation: 41

From the official ServerApplication documentation:

New threads must only be created in initialize() or main() or methods called from there, but not in the application class' constructor or in the constructor of instance variables. The reason for this is that fork() will be called in order to create the daemon process, and threads created prior to calling fork() won't be taken over to the daemon process.

Upvotes: 4

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