Yasuhiro Matsumoto wrote:

> On Wednesday, March 16, 2016 at 7:11:29 AM UTC+9, Bram Moolenaar wrote:
> > Patch 7.4.1578
> > Problem:    There is no way to invoke a function later or periodically.
> > Solution:   Add timer support.
> > Files:      src/eval.c, src/ex_cmds2.c, src/screen.c, src/ex_docmd.c,
> >             src/feature.h, src/gui.c, src/proto/eval.pro,
> >             src/proto/ex_cmds2.pro, src/proto/screen.pro, src/structs.h,
> >             src/version.c, src/testdir/test_alot.vim,
> >             src/testdir/test_timers.vim, runtime/doc/eval.txt
> 
> win32 console doesn't work. maybe unix also need fix like this.
> 
> diff --git a/src/os_win32.c b/src/os_win32.c
> index d7b5634..88abb60 100644
> --- a/src/os_win32.c
> +++ b/src/os_win32.c
> @@ -1469,6 +1469,9 @@ WaitForChar(long msec)
>  #ifdef FEAT_CLIENTSERVER
>       serverProcessPendingMessages();
>  #endif
> +#ifdef FEAT_TIMERS
> +     check_due_timer();
> +#endif
>  
>       if (0
>  #ifdef FEAT_MOUSE

Can you explain why this is needed?  There is a call to
check_due_timer() a bit further down, is that not reached?

The idea is that timers are not triggered when checking if a character
is available (waittime zero), only when actually getting a character
(waittime -1 or 'updatetime').

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