I was caught by this same thing a while ago. I was told that interrupting interprocess waits is not trivial and is not implemented. I just had to switch to a timed wait and sort of poll for the interrupt.

---
Aaron Wright




From:        Michael Herrmann <mherrmann.at@gmail.com>
To:        boost-users@lists.boost.org
Date:        04/12/2012 03:51 AM
Subject:        [Boost-users] Interrupting interprocess::message_queue::receive
Sent by:        boost-users-bounces@lists.boost.org

---

Hi all,

I am receiving messages from a message_queue via the blocking
receive(...)-method from a separate boost::thread. When I interrupt this
thread, the receive(...)-method never returns (not even with an
thread::thread_interrupted exception). Am i doing something wrong or
could this be a bug in message_queue?

The situation I am talking about is illustrated by the following program
never returning:

    #include <boost/thread.hpp>
    #include <boost/interprocess/detail/config_begin.hpp>
    #include <boost/interprocess/ipc/message_queue.hpp>
    #include <iostream>
    #include <vector>

    using namespace boost::interprocess;

    void receive() {
        try {
            message_queue mq(open_or_create, "message_queue", 100,
sizeof(int));

            unsigned int priority;
            message_queue::size_type recvd_size;

            int number;

            std::cout << "Trying to receive one int..." << std::endl;
            mq.receive(&number, sizeof(number), recvd_size, priority);
        } catch(interprocess_exception &ex) {
            message_queue::remove("message_queue");
            std::cout << "Exception occurred: " << ex.what() << std::endl;
        } catch(boost::thread_interrupted &ex) {
            std::cout << "Thread interrupted. " << std::endl;
        }
    }

    int main() {
        message_queue::remove("message_queue");
        boost::thread t(receive);
        t.interrupt();
        t.join();
    }

    #include <boost/interprocess/detail/config_end.hpp>

Thanks!

Michael
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