Boost logo

Boost :

Subject: [boost] boost::interprocess::bad_alloc in copy ctor of slist
From: Christoph Mathys (eraserix_at_[hidden])
Date: 2008-12-03 04:55:20


I have an object containing an interprocess slist (wrapped in a simple
template) which I first construct outside shared memory. Then I want
to push_front this object into a slist lying inside shared memory. And
I get an interprocess::bad_alloc exception from the lists copy
constructor. If I don't use the slist's copy ctor but something like
this->assign(x.begin(), x.end()), the code runs through (the list was
always empty in the test).

I use gcc 4.2.4 on linux 2.6.24 (ubuntu 8.04). Boost 1.36

What am I doning wrong?


Following the throwing code:

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

using namespace boost::interprocess;

managed_shared_memory* getSegment() {
    static managed_shared_memory segment(create_only, "MySharedMemory", 65536);
    return &segment;

template<typename T>
struct my_slist {
   typedef allocator<T, managed_shared_memory::segment_manager> ShmemAllocator;
   typedef slist<T, ShmemAllocator> List;

   my_slist() : m_list(ShmemAllocator(getSegment()->get_segment_manager())) { }

   void push_front(const T& obj)
   { m_list.push_front(obj); }

   List m_list;

struct ListHolder {
    my_slist<int> m_slist;

typedef my_slist<ListHolder> HolderList;

int main() {
   HolderList *holderlist =

   ListHolder asdf;
   holderlist->push_front(asdf); // exception boost::interprocess::bad_alloc
   return 0;

Boost list run by bdawes at, gregod at, cpdaniel at, john at