I am trying to use a vector with a managed_mapped_file. http://www.boost.org/doc/libs/1_35_0/doc/html/boost/interprocess/vector.html
seems to indicate this can be done. When I try to run the code
below, it fails with a "bus error" (on OS X) after printing "Entering
item in vector". What am I doing wrong? Also, how can I grow this
managed_mapped_file as I add things to the vector? I get runtime
errors using the managed_mapped_file::grow() function.
The code below should just fill up a vector with powers of 2, and
print it. I am trying to understand the library before I implement it
for something real.
Code below:
#include
#include
#include
#include
#include
#include
#include
#include <iostream>
#include <fstream>
#include <cstring>
#include <cstddef>
#include <cstdio>
#include <cmath>
int main ()
{
using namespace boost::interprocess;
try{
std::cout << "Starting" << std::endl;
managed_mapped_file mfile (open_or_create, "MyMappedFile", 65536);
std::cout << "Mapped file" << std::endl;
typedef allocator
ShmemAllocator;
typedef vector MyVector;
const ShmemAllocator alloc_inst (mfile.get_segment_manager());
std::cout << "Making vector" << std::endl;
MyVector* vec = mfile.construct<MyVector>("vec")(alloc_inst);
std::cout << "Made vector" << std::endl;
std::cout << "Filling vector" << std::endl;
int i = 0;
for(i = 0; i < 63; ++i)
{
std::cout << "Entering item in vector" << std::endl;
vec->push_back(pow(2,i));
std::cout << "Entered item in vector" << std::endl;
}
std::cout << "Filled vector" << std::endl;
std::cout << "Size of vec is:\t" << vec->size() << std::endl;
std::cout << "Reverse printing contents of vector" << std::endl;
for(i = vec->size()-1; i >= 0; --i)
{
std::cout << "At " << i << ":\t" << vec->at(i) << std::endl;
}
std::cout << "Printed contents of vector" << std::endl;
}
catch(interprocess_exception &ex){
std::remove("MyMappedFile");
std::cout << ex.what() << std::endl;
return 1;
}
std::remove("MyMappedFile");
return 0;
}
Henry