Ken Takata wrote:

> 2016/11/25 Fri 1:23:12 UTC+9 Bram Moolenaar wrote:
> > Patch 8.0.0097
> > Problem:    When a channel callback consumes a lot of time Vim becomes
> >             unresponsive. (skywind)
> > Solution:   Bail out of checking channel readahead after 100 msec.
> > Files:      src/os_unix.c, src/misc2.c, src/vim.h, src/os_win32.c
> 
> > +     long
> > + elapsed(DWORD start_tick)
> > + {
> > +     DWORD now = GetTickCount();
> > + 
> > +     if (now < start_tick)
> > +   /* overflow */
> > +   return (long)now;
> > +     return (long)now - (long)start_tick;
> > + }
> 
> I don't think overflow checking is needed here.
> 
>     return (long)now - (long)start_tick;
> 
> should work on Windows even if overflow occurs.

DWORD is 32 bits unsigned, right?  And long is 32 bits signed.
I suppose that works.

-- 
hundred-and-one symptoms of being an internet addict:
49. You never have to deal with busy signals when calling your ISP...because
    you never log off.

 /// Bram Moolenaar -- b...@moolenaar.net -- http://www.Moolenaar.net   \\\
///        sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
\\\  an exciting new programming language -- http://www.Zimbu.org        ///
 \\\            help me help AIDS victims -- http://ICCF-Holland.org    ///

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