Ion Gaztañaga wrote:
Hi Glenn,
Since interprocess isn't in the official tarball yet i've been working with the head version from CVS. Whether or not emulation is used is determined by the value in _POSIX_THREAD_PROCESS_SHARED. In a 2.6.17 kernel that I'm running on another system the value is 200112L so indeed the native mutexes and condition variables are used. The system that I was having a problem with has a 2.6.9 kernel and the _POSIX_THREAD_PROCESS_SHARED value of -1; corresponding to "not supported".
Thanks for the information and the patch. I've just uploaded it to CVS.
Regards,
Ion _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost
Hey Ion, I am getting seg faults running the following interprocess code using the latest boost cvs distro. Conditions work properly using the old shmem libs but I think something must have changed since then to cause this. The seg fault happens in the atomic function atomic_dec32. I'm running kernel 2.6.9-42 if that helps. If I'm doing something wrong here, please let me know but this has worked in the past. Thanks, Harold //client code follows... #include <boost/interprocess/managed_shared_memory.hpp> #include <boost/interprocess/sync/mutex_family.hpp> #include <boost/interprocess/sync/scoped_lock.hpp> #include <boost/interprocess/sync/interprocess_condition.hpp> using namespace boost::interprocess; class MyClass { public: interprocess_condition sent_condition; interprocess_condition received_condition; interprocess_mutex mutex; }; int main () { managed_shared_memory* psegment = new managed_shared_memory( open_or_create, "MySharedMemory", //segment name 256000000); //segment size in bytes MyClass *instance = psegment->find_or_construct<MyClass> ("MyClass") /*name of the object*/ (); scoped_lock<mutex_family::mutex_type> lock(instance->mutex); std::cout << "Waiting on Server..." << std::endl; instance->sent_condition.wait(lock); instance->received_condition.notify_all(); return 0; } //server code follows... #include <boost/interprocess/managed_shared_memory.hpp> #include <boost/interprocess/sync/mutex_family.hpp> #include <boost/interprocess/sync/scoped_lock.hpp> #include <boost/interprocess/sync/interprocess_condition.hpp> using namespace boost::interprocess; class MyClass { public: interprocess_condition sent_condition; interprocess_condition received_condition; interprocess_mutex mutex; }; int main () { managed_shared_memory* psegment = new managed_shared_memory( open_or_create, "MySharedMemory", //segment name 256000000); //segment size in bytes MyClass *instance = psegment->find_or_construct<MyClass> ("MyClass") /*name of the object*/ (); instance->sent_condition.notify_all(); scoped_lock<mutex_family::mutex_type> lock(instance->mutex); std::cout << "Waiting on Client..." << std::endl; instance->received_condition.wait(lock); psegment->destroy<MyClass>("MyClass"); shared_memory_object::remove("MySharedMemory"); return 0; }