Changeset cd7581b in Lumiera

Timestamp:

2026-05-20T23:47:11Z (4 weeks ago)

Author:

Ichthyostega <prg@…>

Branches:

dev/play, documentation, integration

Children:

e32eec3

Parents:

a4b8313

git-author:

Ichthyostega <prg@…> (20/05/26 21:17:59)

git-committer:

Ichthyostega <prg@…> (20/05/26 23:47:11)

Message:

BufferProvider: investigate tricky race at thread shutdown

...even while this situation is unlikely, it needs to be considered:
A worker thread might terminate unexpectedly, due to an error;
all thread-local objects will be destroyed automatically — while the
EngineBufferManager might be processing further allocations requested
by that very thread, and dispatch them towards an already destroyed LocalMemPool

This turns out to be a nasty problem, since the whole setup was created
to allow the workers to operate independently from each other; any handshake
or registration/deregistration mechanism would require a lock of sorts,
thereby defeating the whole purpose of the setup.

The best solution I could find is to rely on a instance marker hash,
that can be checked with an atomic read prior to each dispatch of a
memory allocation. The destructor of the local pool would then be able
to disengage, by invalidating that hash.

To evaluate this solution, I developed this mechanism
as a free-standing library component, called LiveMark

(No files)