boost.interprocess中共享内存中的内存问题

这让我很沮丧。我只是想创建一个共享内存缓冲区类,它在通过boost.interprocess创建的共享内存中使用,我可以在其中读取/存储数据。我写了以下内容来测试功能

#include <boost/interprocess/shared_memory_object.hpp>
#include <boost/interprocess/mapped_region.hpp>
#include <iostream>
using namespace std;
using namespace boost::interprocess;

int main( int argc, char* argv[] ) {
    shared_memory_object::remove( "MyName" );
    // Create a shared memory object
    shared_memory_object shm ( create_only, "MyName", read_write );
    // Set size for the shared memory region
    shm.truncate(1000);
    // Map the whole shared memory in this process
    mapped_region region(shm, read_write);
    // Get pointer to the beginning of the mapped shared memory region
    int* start_ptr;
    start_ptr = static_cast<int*>(region.get_address());

    // Write data into the buffer
    int* write_ptr = start_ptr;
    for( int i= 0; i<10; i++ ) {
        cout << "Write data: " << i << endl;
        memcpy( write_ptr, &i, sizeof(int) );
        write_ptr++;
    }

    // Read data from the buffer
    int* read_ptr = start_ptr;
    int* data;
    for( int i= 0; i<10; i++ ) {
        memcpy( data, read_ptr, sizeof(int) );
        cout << "Read data: " << *data << endl;
        read_ptr++;
    }

    shared_memory_object::remove( "MyName" );
    return 0;
}

当我运行这个程序时,它可以写入数据,但第一个程序会出错。 memcpy 在读取循环中。GDB说:

程序接收到信号exc_bad_access,无法访问内存。 原因:kern_地址无效:0x0000000000000000 0x0007fffffe007c5在uu memcpy()中

(GDB)在哪里

#uuu memcpy()中的0 0x0007fffffe007c5 #1 0x0000000000100000E45 IN MAIN(argc=1,argv=0x7fff5fbff9d0)AT Try.cpp:36

功能很简单,我不知道我缺少什么。任何帮助都将不胜感激。