boost::interprocess(2)

//doc_anonymous_mutex_shared_data.hpp
#include <boost/interprocess/sync/interprocess_mutex.hpp>

struct shared_memory_log
{
    enum { NumItems = 100 };
    enum { LineSize = 100 };

    shared_memory_log()
        :  current_line(0)
        ,  end_a(false)
        ,  end_b(false)
    {}

    //Mutex to protect access to the queue
    boost::interprocess::interprocess_mutex mutex;

    //Items to fill
    char   items[NumItems][LineSize];
    int num;

    int    current_line;
    bool   end_a;
    bool   end_b;
};

发送端:

#include <boost/interprocess/shared_memory_object.hpp>
#include <boost/interprocess/mapped_region.hpp>
#include <boost/interprocess/sync/scoped_lock.hpp>
#include "doc_anonymous_mutex_shared_data.hpp"
#include <iostream>
#include <cstdio>
#include <windows.h>
#include <thread>
using namespace boost::interprocess;
mapped_region* p_reg;

void funs(shared_memory_log * data)
{
    while(true)
    {
        {
            //Write some logs
            //Lock the mutex
            scoped_lock<interprocess_mutex> lock(data->mutex);
            /*std::sprintf(data->items[(data->current_line++) % shared_memory_log::NumItems]
            ,"%s_%d", "process_a", i);*/
            data->num++;
            //if(i == (shared_memory_log::NumItems-1))
            //    data->end_a = true;
            //Mutex is released here
            
        }
        Sleep(500);
        //Wait until the other process ends
        /*while(1){
            scoped_lock<interprocess_mutex> lock(data->mutex);
            if(data->end_b)
                break;
        }*/
    }
}

int main ()
{
    try{
        //Remove shared memory on construction and destruction
        //struct shm_remove
        //{
        //    shm_remove() { shared_memory_object::remove("MySharedMemory"); }
        //    ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
        //} remover;

        //Create a shared memory object.
        shared_memory_object shm
            (open_or_create               //only create
            ,"MySharedMemory"          //name
            ,read_write   //read-write mode
            );

        //Set size
        shm.truncate(sizeof(shared_memory_log));

        //Map the whole shared memory in this process
        p_reg = new mapped_region
            (shm                       //What to map
            ,read_write   //Map it as read-write
            );

        //Get the address of the mapped region
        void * addr       = p_reg->get_address();

        //Construct the shared structure in memory
        shared_memory_log * data = new (addr) shared_memory_log;

        std::thread th(funs, data);
        th.detach();
        getchar();
        shared_memory_object::remove("MySharedMemory");
    }
    catch(interprocess_exception &ex){
        std::cout << ex.what() << std::endl;
        shared_memory_object::remove("MySharedMemory");
        getchar();
        return 1;
    }
    return 0;
}

接收端：

#include <boost/interprocess/shared_memory_object.hpp>
#include <boost/interprocess/mapped_region.hpp>
#include <boost/interprocess/sync/scoped_lock.hpp>
#include "doc_anonymous_mutex_shared_data.hpp"
#include <iostream>
#include <cstdio>
#include <thread>
#include <windows.h>
using namespace boost::interprocess;
mapped_region* p_reg;
int g_num = 0;
void fung(shared_memory_log * data)
{
    while (true)
    {
        {
            scoped_lock<interprocess_mutex> lock(data->mutex);
            std::cout << data->num << "---------" << data->num - g_num <<  std::endl;
            g_num = data->num;
        }
        Sleep(300);

    }
    
}


int main ()
{
    //如何保证会删除
    //Remove shared memory on destruction
    //struct shm_remove
    //{
    //    ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); }
    //} remover;

    //Open the shared memory object.
    shared_memory_object shm
        (open_only                  //only open
        ,"MySharedMemory"              //name
        ,read_write  //read-write mode
        );

    //Map the whole shared memory in this process
    p_reg = new mapped_region
        (shm                       //What to map
        ,read_write //Map it as read-write
        );

    //Get the address of the mapped region
    void * addr       = p_reg->get_address();

    //Construct the shared structure in memory
    shared_memory_log * data = static_cast<shared_memory_log*>(addr);
#if 0
    //Write some logs
    for(int i = 0; i < 100; ++i){
        //Lock the mutex
        scoped_lock<interprocess_mutex> lock(data->mutex);
        std::sprintf(data->items[(data->current_line++) % shared_memory_log::NumItems]
        ,"%s_%d", "process_a", i);
        if(i == (shared_memory_log::NumItems-1))
            data->end_b = true;
        //Mutex is released here
    }
#endif
    //读log
#if 1
    std::thread th(fung, data);
    th.detach();


#endif
    getchar();
    shared_memory_object::remove("MySharedMemory");
    //Wait until the other process ends
    //while(1){
    //    scoped_lock<interprocess_mutex> lock(data->mutex);
    //    if(data->end_a)
    //        break;
    //}
    return 0;
}

有点BUG，在调调