bug#17392: 24.3.90; cursor blinks faster and faster

[Eli Zaretskii]

> From: Lennart Borgman <lennart.borgman@gmail.com>
> Date: Tue, 13 May 2014 20:25:40 +0200
> Cc: Michael Heerdegen <michael_heerdegen@web.de>, 17392@debbugs.gnu.org
> 
> For me it was difficult to understand the division among threads.

There are no threads involved here, as both the C code which runs the
timers and the Lisp code run in the same single thread.

On top of that, Michael is working on GNU/Linux, so any w32 threads
aren't relevant.

> What could be done to make this easier is checking the return value of
> every single system call.

There are no system calls involved in the code in question.