flock() #80
Description
It seems flock doesnt work like on posix. At least i have a testcase where a LOCK_SH cant be updated to a LOCK_EX. Another issue seem that when LOCK_SH is set i cant write to the file.
Heimdal has a testcase for that. And commit bitwiseworks/heimdal-os2@eef9bc1 works around it.