NamedLocks are allowing callers through when many locks taken.

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The following unit test will reproduce the error:

import 'dart:isolate';
import 'package:dshell/dshell.dart';
import 'package:test/test.dart';

void worker(int port) {
  print('starting $port');
  NamedLock(name: 'gshared-compile').withLock(() {
    print('acquired lock $port');
    sleep(5);
    print('finished $port');
  });
}

void main() {
  void locker(int name) {
    Isolate.spawn(worker, name);
  }

  test('named lock 1', () {
    for (var i = 0; i < 20; i++) {
      locker(i);
    }
    sleep(59);
  }, timeout: Timeout(Duration(minutes: 2)));
}

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Fixed in 1.10.13