Re: Can't Lua ever sleep?

[Daurnimator <quae@...>]

On 6 March 2017 at 17:39, Dirk Laurie <dirk.laurie@gmail.com> wrote:
> 2017-03-06 8:35 GMT+02:00 Daurnimator <quae@daurnimator.com>:
>> On 6 March 2017 at 17:31, Dirk Laurie <dirk.laurie@gmail.com> wrote:
>>> 2017-03-06 7:53 GMT+02:00 Sean Conner <sean@conman.org>:
>>>> It was thus said that the Great Dirk Laurie once stated:
>>>>> I've searched the manual for "sleep", "wait", "pause", "delay"
>>>>> and not found any except the pauses of the GC. Does it have
>>>>> a different name or must I load some module?
>>>>
>>>>   In the context of POSIX:
>>>>
>>>>         sleep() pause execution for a given amount of time
>>>>         wait()  pause execution until a child process exits
>>>>         pause() pause execution until a signal happens
>>>>         delay   there is no spoon
>>>>
>>>>   -spc (So what exactly are you trying to achieve?)
>>>
>>> A semi-animated slideshow in lcurses. I have a Turbo Pascal
>>> mindset when it comes to fullscreen text apps. Unit Crt used to
>>> have a "Delay", lcurses seems not to.
>>
>> Do you actually want to sleep for X seconds?
>> Or do you want to sleep for X seconds *or* until input is received?
>> (e.g. to allow pressing 'space' to go forwards a slide manually)
>
> I can imagine that one would crave for the latter sooner or later,
> although for now the former will do.

For just sleeping, you have lots of options:

  - os.execute(string.format("sleep %d", X))
  - require "unix".sleep(X)
  - require "posix".sleep(X)
  - require "cqueues".sleep(X)
  - require "socket".sleep(X)

However if you want to also wait on input, you'll need to be more choosy:

  - require "cqueues".poll({pollfd=0--[[for stdin]]}, X)
  - require "socket".select({some_fake_socket}, {}, X)
  - require "unix".poll({{fd=0; events=1}}, 1)

Personally I always just start with cqueues now: the only reason I
wouldn't is if I needed to support windows.