Re: SGCL - Garbage Collector for C++

Hi.

I added the possibility of blocking resources on the level of single
indicators. The blocking mechanism is using the "lock cmpxchg" instruction.
This solution isn't more efficient than system mechanisms. All atomic
operations are very time-consuming.

rgds
Sebastian Nibisz


//-------------------------------------------------------------------------------
void thread_writer()
{
    gc<int> val = gcnew int;
    lock(g_val)
    {
        *val = *g_val + 1;
        g_val = val;
    }
}

void thread_reader()
{
    gc<int> l_val;
    lock(g_val) // copy operation isn't atomic
    {
        l_val = g_val;
    }

    if (l_val)
    {
        printf("read %d\n", *l_val);
    }
}

//-------------------------------------------------------------------------------
//-------------------------------------------------------------------------------
struct node
{
    node(void* s) : state(s) {}
    gc<node> next;
    void* state;
};

static gc<node> g_list;

void list_push(void* state) throw(std::bad_alloc)
{
    gc<node> n = gcnew node(state);
    lock(g_list)
    {
        n->next = g_list;
        g_list = n;
    }
}

void* list_pop()
{
    void* state = 0;
    lock(g_list)
    {
        if (g_list)
        {
            state = g_list->state;
            g_list = g_list->next;
        }
    }
    return state;
}
//-------------------------------------------------------------------------------

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