如何使用Boost.Interprocess将数据流式传输到其他应用程序？

The main application needs to update the shared memory at a fast frequency.

主应用程序需要以较快的频率更新共享内存。

And several consuming applications need to read from the shared memory to update the streamed data.

并且几个消费应用程序需要从共享内存中读取以更新流数据。

main and consuming applications are different processes.

主要和消费应用程序是不同的过程。

How to implement this with Boost.Interprocess ?

如何使用Boost.Interprocess实现这一点？

1 个解决方案

#1

producer:

制片人：

#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/sync/scoped_lock.hpp>
#include <boost/interprocess/sync/interprocess_mutex.hpp>
#include <boost/thread.hpp>
#include <iostream>

struct shared_data_t {
   boost::uint32_t data;
   boost::interprocess::interprocess_mutex mutex;
};

/***************************************************************************/

/* producer */
int main(int argc, char** argv) {
   const char* shname = "_unique_object_name_";
   boost::shared_ptr<const char> remover(
      shname,
      boost::interprocess::shared_memory_object::remove
   );
   try {
      boost::interprocess::shared_memory_object shared_object(
         boost::interprocess::create_only,
         shname,
         boost::interprocess::read_write
      );
      shared_object.truncate(sizeof(shared_data_t));
      boost::interprocess::mapped_region region(
         shared_object,
         boost::interprocess::read_write
      );
      shared_data_t* data = new(region.get_address())shared_data_t;
      assert(data);
      const boost::uint32_t count = 0x1000;
      for ( boost::uint32_t idx = 0; idx < count; ++idx ) {
         {  boost::interprocess::scoped_lock<
               boost::interprocess::interprocess_mutex
            > lock(data->mutex);
            data->data = idx;
         }
         boost::this_thread::sleep(boost::posix_time::seconds(1));
      }
   } catch(boost::interprocess::interprocess_exception &e){
      std::cout << e.what() << std::endl;
      return 1;
   }

   return 0;
}

consumer:

消费者：

#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/sync/scoped_lock.hpp>
#include <boost/interprocess/sync/interprocess_mutex.hpp>
#include <boost/thread.hpp>

struct shared_data_t {
   boost::uint32_t data;
   boost::interprocess::interprocess_mutex mutex;
};

/***************************************************************************/

/* consumer */
int main(int argc, char** argv) {
   try {
      boost::interprocess::shared_memory_object shared_object(
         boost::interprocess::open_only,
         "_unique_object_name_",
         boost::interprocess::read_only
      );
      shared_object.truncate(sizeof(shared_data_t));
      boost::interprocess::mapped_region region(
         shared_object,
         boost::interprocess::read_only
      );
      shared_data_t* data = new(region.get_address())shared_data_t;
      assert(data);
      while ( true ) {
         {  boost::interprocess::scoped_lock<
               boost::interprocess::interprocess_mutex
            > lock(data->mutex);
            std::cout << "ping: " << data->data << std::endl;
         }
         boost::this_thread::sleep(boost::posix_time::milliseconds(100));
      }
   } catch(boost::interprocess::interprocess_exception &e){
      std::cout << e.what() << std::endl;
      return 1;
   }
   return 0;
}

man: http://www.boost.org/doc/libs/1_43_0/doc/html/interprocess/synchronization_mechanisms.html

man：http：//www.boost.org/doc/libs/1_43_0/doc/html/interprocess/synchronization_mechanisms.html

#1