What is the iOS (or RubyMotion) idiom for waiting on a block that executes asynchronously?

Question

I have been pulling my hair out for weeks on this niggling problem, and I just can\'t find any info or tips on how or what to do, so I\'m hoping someone here on the RubyMoti

Answer 1

Here's what I do to make multi-threaded synchronized asynchronous calls.

def make_sync2(&block)
  @semaphore ||= Dispatch::Semaphore.new(0)
  @semaphore2 ||= Dispatch::Semaphore.new(1)
  BubbleWrap::Reactor.schedule do
    result = block.call("Mateus")
    @semaphore2.wait # Wait for access to @result
    @result = result
    @semaphore.signal
  end
  @semaphore.wait # Wait for async task to complete
  result = @result
  @semaphore2.signal
  result
end