Re: Surprisingly high use of file descriptors

[Robert Pluim]

>>>>> On Thu, 05 May 2022 11:20:49 +0300, Eli Zaretskii <eliz@gnu.org> said:

    >> From: Robert Pluim <rpluim@gmail.com>
    >> Cc: monnier@iro.umontreal.ca,  emacs-devel@gnu.org
    >> Date: Thu, 05 May 2022 09:51:03 +0200
    >> 
    >> >>>>> On Thu, 05 May 2022 10:47:26 +0300, Eli Zaretskii <eliz@gnu.org> 
said:
    >> 
    Eli> FTR, on MS-Windows the implementation uses a file handle per watch
    Eli> (one watch for each directory), but that handle is not monitored by
    Eli> the emulated pselect.  It also creates one thread per each watch.  The
    Eli> maximum number of file handles per process on MS-Windows is AFAIK very
    Eli> large (in the millions), and the maximum number of threads per process
    Eli> is on the order of tens of thousands.
    >> 
    >> That sounds like something Someone™ could use to write a proper 'poll'
    >> emulation ☺️

    Eli> What for? for file notifications we don't use any poll-like interface
    Eli> anyway.

I meant for subprocess support. Although if it behaved like 'select' I
wouldnʼt mind either.

    >> (I think gnulib has one, but I haven't looked at it).

    Eli> Isn't is still limited to 64 handles?

<peeks> It uses MsgWaitForMultipleObjects, so I think so.

Robert
--