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
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