A C# example of how we might use locks inside GitHub Desktop

LockExample.cs

public class LockExample
{
  private IRepository repository;

  public LockExample(IRepository repository)
  {
    this.repository = repository;
  }

  public IObservable<Unit> Fetch()
  {
    // execute a git fetch
  }

  public IObservable<Unit> FindMergeBase(Sha first, Sha second)
  {
    // calculate the merge base between two sha's
  }

  public IObservable<Unit> Commit()
  {
    // create a commit
  }

  public void DoWork(Sha first, Sha second)
  {
    repository.WithConcurrentConnection(Fetch)
              .Subscribe();

    repository.WithConcurrentConnection(FindMergeBase(first, second))
              .Subscribe();

    repository.WithExclusiveConnection(Commit)
              .Subscribe();
  }
}