How does the Dart VM manage OS threads under the hood when multiple isolates are created?

[mraleph]

@filip

To allocate memory for Int64List outside the Dart heap, I need to use FFI, correct? I can’t, for example, use some invocation on Int64List or ByteBuffer, can I?

You need to use FFI but you should not need to write any native code for that:

import 'package:ffi/ffi.dart';

final mem = malloc.allocate<Uint8>(n);
final list = mem.asTypedList(n, finalizer: malloc.nativeFree);

// You can sent `mem` to another isolate and there `asTypeList` it.

This is all you need. Just need to be careful with finalization (don’t attach multiple finalizers or you would need more complicated lifetime management scheme with ref counting).