[Bug 236815] [patch] devel/glib20: loops over all possible file descriptors

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236815

--- Comment #19 from rozhuk.im at gmail.com ---
(In reply to Ting-Wei Lan from comment #12)

IMHO this is wrong or incomplete description.

1. malloc() can not cause deadlock, it is heavy used by many multithread apps.

2. Docs says that opendir() is thread and mt safe:
http://man7.org/linux/man-pages/man3/opendir.3.html
But readdir() is not: MT-Unsafe:
http://man7.org/linux/man-pages/man3/readdir.3.html

3. Reading dir using more than one syscall is bad idea because between read it
can change some content is it will not be handled/processed.
As I remember this was a reason to drop opendir() in mine FAM backend and some
strange crashes:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214338

So I do not understand why some one can need LOCK() in fdwalk().

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