void* memory = ::mmap(nullptr, size << xbt_pagebits, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_POPULATE, -1, 0);
if (memory == MAP_FAILED)
xbt_die("Could not mmap initial snapshot pages.");
this->top_index_ = 0;
void* memory = ::mmap(nullptr, size << xbt_pagebits, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_POPULATE, -1, 0);
if (memory == MAP_FAILED)
xbt_die("Could not mmap initial snapshot pages.");
this->top_index_ = 0;