Add timeout to timeout error message.

lib/async/scheduler.rb

@@ -241,7 +241,7 @@ def io_wait(io, events, timeout = nil)
  elsif timeout = get_timeout(io)
  # Otherwise, if we default to the io's timeout, we raise an exception:
  timer = @timers.after(timeout) do
- fiber.raise(::IO::TimeoutError, "Timeout while waiting for IO to become ready!")
+ fiber.raise(::IO::TimeoutError, "Timeout (#{timeout}s) while waiting for IO to become ready!")
  end
  end
 
@@ -256,7 +256,7 @@ def io_read(io, buffer, length, offset = 0)
 
  if timeout = get_timeout(io)
  timer = @timers.after(timeout) do
- fiber.raise(::IO::TimeoutError, "Timeout while waiting for IO to become readable!")
+ fiber.raise(::IO::TimeoutError, "Timeout (#{timeout}s) while waiting for IO to become readable!")
  end
  end
 
@@ -271,7 +271,7 @@ def io_write(io, buffer, length, offset = 0)
 
  if timeout = get_timeout(io)
  timer = @timers.after(timeout) do
- fiber.raise(::IO::TimeoutError, "Timeout while waiting for IO to become writable!")
+ fiber.raise(::IO::TimeoutError, "Timeout (#{timeout}s) while waiting for IO to become writable!")
  end
  end