Ticket #4374: ShmTest.cpp

#include <iostream>

#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/allocators/allocator.hpp>
#include <boost/interprocess/containers/vector.hpp>

namespace bip = boost::interprocess;

typedef bip::managed_shared_memory::segment_manager segment_manager_t;
typedef bip::allocator<long, segment_manager_t> long_allocator;
typedef bip::vector<long, long_allocator> long_vector;

int main(int argc, char ** argv) {
        struct shm_remove  {
                shm_remove()    { bip::shared_memory_object::remove("ShmTest"); }
                ~shm_remove()   { bip::shared_memory_object::remove("ShmTest"); }
        } remover;

        size_t szLength = 280000000;
        size_t szRequired = szLength * sizeof(long);
        size_t szRequested = (size_t) (szRequired * 1.05);
        bip::managed_shared_memory segment(bip::create_only, "ShmTest", szRequested);

        std::cout <<
                "Length:       " << szLength << "\n" <<
                "sizeof(long): " << sizeof(long) << "\n" <<
                "Required:     " << szRequired << "\n" <<
                "Requested:    " << szRequested << "\n" <<
                "Allocated:    " << segment.get_size() << "\n" <<
                "Overhead:     " << segment.get_size() - segment.get_free_memory() << "\n" <<
                "Free:         " << segment.get_free_memory() << "\n\n";

        long_allocator alloc(segment.get_segment_manager());
        long_vector vector(alloc);

        if (argc > 1) {
                std::cout << "Reserving Length of " << szLength << "\n";
                vector.reserve(szLength);
                std::cout << "Vector Capacity: " << vector.capacity() << "\tFree: " << segment.get_free_memory() << "\n\n";
        }

        for (size_t i = 0; i < szLength; i++) {
                if ((i % (szLength / 100)) == 0) {
                        std::cout << i << ": " <<"\tVector Capacity: " << vector.capacity() << "\tFree: " << segment.get_free_memory() << "\n";
                }
                vector.push_back(i);
        }
        std::cout << "end: " <<"\tVector Capacity: " << vector.capacity() << "\tFree: " << segment.get_free_memory() << "\n";

        return 0;
}