// Static variables
struct evl_heap heap_manager::s_runtime_heap;
bool heap_manager::s_use_evl = false; // Flag used in global new/delete to switch between Linux and EVL heaps
size_t heap_manager::s_init_bytes = 2147483648; // 2GB

///////////////////////////////////////////////////////////////////////////////
void* heap_manager::alloc_block(size_t bytes)
{
    void* data = evl_alloc_block(&s_runtime_heap, bytes);
    if (data == NULL)
    {
        // Switch back to Linux heap to avoid infinite alloc loop
        s_use_evl = false;
        throw(std::runtime_error("Error allocating a block on the EVL heap"));
    }
    return data;
}

///////////////////////////////////////////////////////////////////////////////
void heap_manager::free_block(void* block)
{
    int ret = evl_free_block(&s_runtime_heap, block);
    if (ret < 0)
    {
        sfhm::rtString msg;
        msg.Format("%s:%d: Error freeing a block on the EVL heap", __FILE__, __LINE__);
        throw(std::system_error(ret, std::generic_category(), msg));
    }
}

///////////////////////////////////////////////////////////////////////////////
void heap_manager::prefault()
{
    char *dummy = (char*)alloc_block(s_init_bytes);
    for (size_t i = 0; i < s_init_bytes; i += sysconf(_SC_PAGESIZE))
        dummy[i] = 1;  
    free_block(dummy);
}