Re: [gtk-osx-users] Slow gdk_display_get_name() on macOS Sierra

[Jiří Techet <techet gmail com>]

By the way, I checked with wireshark and [NSHost currentHost] sends 3 pairs (IPv4 and IPv6) MDNS (multicast DNS used by Bonjour) PTR queries for the IPv6 address and waits for response until it times out. This really isn't a good method to be called by gdk_display_get_name() which could actually return arbitrary string because unlike X11 there will never be more displays.

By the way I noticed there's also g_get_host_name() which is a more user-friendly way to call gethostname().

Jiri

On Wed, Feb 15, 2017 at 10:33 PM, Jiří Techet <techet gmail com> wrote:

Hi,

after switching to macOS Sierra I (and another user) noticed that Geany whose OS X port I maintain starts significantly slower:

https://github.com/geany/geany/issues/1277

After some debugging it turns out it's the gdk_display_get_name() call which takes several seconds to complete. This function just returns [NSHost currentHost]; according to Apple documentation

https://developer.apple.com/reference/foundation/nshost/1408946-currenthost

the function can block for several seconds, depending on user's configuration. I found some more mentions of this behaviour, e.g.

http://secure.macscripter.net/viewtopic.php?id=45309

Interestingly, simple unix gethostname() as used in Apple's implementation of the hostname command

https://opensource.apple.com/source/shell_cmds/shell_cmds-81.1/hostname/hostname.c

returns immediately (at least for me). Would it be OK to use gethostname() in gdk_display_get_name()? Is there some specific reason why [NSHost currentHost] is used?

Cheers,

Jiri