class SQLite3::Database

def busy_handler_timeout=(milliseconds)

while SQLite sleeps and retries.
This is an alternative to #busy_timeout, which holds the GVL
but only retries up to the indicated number of +milliseconds+.
Sets a #busy_handler that releases the GVL between retries, 
def busy_handler_timeout=(milliseconds)
  timeout_seconds = milliseconds.fdiv(1000)
  busy_handler do |count|
    now = Process.clock_gettime(Process::CLOCK_MONOTONIC)
    if count.zero?
      @timeout_deadline = now + timeout_seconds
    elsif now > @timeout_deadline
      next false
    else
      sleep(0.001)
    end
  end
end