[zeromq-dev] Thread creation location in source

Kenneth Adam Miller kennethadammiller at gmail.com
Sun Jan 12 16:15:20 CET 2014

Yes, it most definitely is in socket creation.

On Sun, Jan 12, 2014 at 9:12 AM, Kenneth Adam Miller <
kennethadammiller at gmail.com> wrote:

> Actually, I found the location of the thread creation function just a
> little after I sent this. It's actually in zmq::thread_t::start. I put a
> cout function there, and although I can see where it runs it prints what I
> gave it to print, I still don't see the link in the code between context
> creation and when the thread start function gets called...
> I think it has to do with socket creation. I'm going to investigate that
> as my next go at it.
> On Sun, Jan 12, 2014 at 6:56 AM, Kenneth Adam Miller <
> kennethadammiller at gmail.com> wrote:
>> I was told that it is in the context creation that threads are created,
>> but so far I haven't found it.
>> I looked through the zmq.cpp file's new_context_t function, which is
>> called to construct a new context just as I was told.
>> new_context_t had nothing to do pertaining to thread creation, so I
>> traced it down to the ctx_t object constructor. I found that it set some
>> parameters to default values, and that it didn't descend from another
>> object but that all of these parameters were not threads. The body of the
>> ctx_t constructor contains only getpid.
>> It isn't until you get into the socket creation part that it starts
>> creating threads. But these are io_thread_t types. I went into it's
>> constructor and found that it doesn't create any threads. It isn't until
>> I've gotten to the thread.cpp files that I see threads creation of the type
>> where concurrency really occurs. I may not have found the right place yet
>> in source (there's a lot, & I'm new), but is that where I need to start, in
>> thread.cpp?
>> It doesn't make sense to me, because I even went so far as to compile and
>> run the hellow world server and client examples, and to place some cout
>> calls in the appropriate constructors:
>> std::cout << "Hooha" << std::endl;    //in io_thread.cpp io_thread_t
>> constructor, which it showed
>> and
>> std::cout << "har har" << std::endl;  //in thread.cpp thread_t start
>> function
>> I even put a few lines in the constructor of thread_t objects. I still
>> can't for the life of me find the place where internal background threads
>> get started by zmq!
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