bug#18420: 24.3; interaction with external process hangs emacs

[Stephen Leake]

Eli Zaretskii <eliz@gnu.org> writes:

> Anyway, it turns out we can make our pipes non-blocking on write,
> which then allows us to use the EWOULDBLOCK/EAGAIN handling in
> send_process.  Please try the patch below, and if it gives good
> results, I will install it shortly.  

Yes, it fixes the problem.

For this test, I reverted wisi-ada-parse-session-send-parse to use a
single (process-send-string process buf-string).

-- 
-- Stephe