Getting a live view of environment variables (Gradle and JDK 9)
dalibor topic
dalibor.topic at oracle.com
Fri May 12 13:28:28 UTC 2017
On 11.05.2017 18:29, Cédric Champeau wrote:
>
>
> Unfortunately, they are not safely mutable in multi-threaded
> programs on many operating system/libc combinations.
>
> But the problem is less about mutating, that it is about reading: the VM
> returns wrong values at some point, because it _assumes_ that the
> environment variables are not mutated.
Right. Assuming that another thread could be simultaneously writing to
the same data structure holding environment variables (char **), reading
itself becomes problematic at such points in time, as you might read a
temporarily corrupted data structure.
I guess the question underneath is if there is a safe point in time when
reading the data could be preformed and no concurrent write from JNI
code corrupting the data when it's partially read is possible.
cheers,
dalibor topic
--
<http://www.oracle.com> Dalibor Topic | Principal Product Manager
Phone: +494089091214 <tel:+494089091214> | Mobile: +491737185961
<tel:+491737185961>
ORACLE Deutschland B.V. & Co. KG | Kühnehöfe 5 | 22761 Hamburg
ORACLE Deutschland B.V. & Co. KG
Hauptverwaltung: Riesstr. 25, D-80992 München
Registergericht: Amtsgericht München, HRA 95603
Komplementärin: ORACLE Deutschland Verwaltung B.V.
Hertogswetering 163/167, 3543 AS Utrecht, Niederlande
Handelsregister der Handelskammer Midden-Niederlande, Nr. 30143697
Geschäftsführer: Alexander van der Ven, Jan Schultheiss, Val Maher
<http://www.oracle.com/commitment> Oracle is committed to developing
practices and products that help protect the environment
More information about the core-libs-dev
mailing list