+#else
+ if (new_bytesize > old_bytesize) {
+ // Grow: first try to add new space after current map
+ new_memory = mmap((char *)this->memory_ + old_bytesize,
+ new_bytesize-old_bytesize,
+ PROT_READ|PROT_WRITE,
+ MAP_PRIVATE|MAP_ANONYMOUS|MAP_POPULATE,
+ -1, 0);
+ if (new_memory == MAP_FAILED)
+ xbt_die("Could not mremap snapshot pages.");
+ // Check if expanding worked
+ if (new_memory != (char *)this->memory_ + old_bytesize) {
+ // New memory segment could not be put at the end of this->memory_,
+ // so cancel this one and try to rellocate everything and copy data
+ munmap(new_memory, new_bytesize-old_bytesize);
+ new_memory = mmap(nullptr,
+ new_bytesize,
+ PROT_READ|PROT_WRITE,
+ MAP_PRIVATE|MAP_ANONYMOUS|MAP_POPULATE,
+ -1, 0);
+ if (new_memory == MAP_FAILED)
+ xbt_die("Could not mremap snapshot pages.");
+ memcpy(new_memory, this->memory_, old_bytesize);
+ munmap(this->memory_, old_bytesize);
+ }
+ }
+ else {
+ // We don't have functions to shrink a mapping, so leave memory as
+ // it is for now
+ new_memory = this->memory_;