这让我感到沮丧。我只是想创建一个共享内存缓冲区类,该类在通过 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;
}
当我运行它时,它写入数据正常,但memcpy
在读取循环中的第一个出现段错误。gdb 说:
程序收到信号 EXC_BAD_ACCESS,无法访问内存。原因:KERN_INVALID_ADDRESS 在地址:0x0000000000000000 0x00007fffffe007c5 in __memcpy()
(gdb) 在哪里
#0 0x00007fffffe007c5 in __memcpy () #1 0x0000000100000e45 in main (argc=1, argv=0x7fff5fbff9d0) at try.cpp:36
功能如此简单,我不知道我错过了什么。任何帮助都感激不尽。