[Bug 1814] SMP race condition between stack free and dispatch

bugzilla-daemon at rtems.org bugzilla-daemon at rtems.org
Fri Aug 10 08:36:51 UTC 2012


--- Comment #9 from Marta Rybczynska <marta.rybczynska at kalray.eu> 2012-08-10 03:36:51 CDT ---
We do not have a document that describes the lock sequences. However, the one
that causes big problems is the lock around the object allocator (Object_Get &
friends). It should be probably split into per-type lock, but that would change
the API in an important way.

We have tried per-core _Thread_Dispatch_disable. If I remember correctly, the
problem was that in some cases the 'interrupts' are disabled in some Object_Get
function and release under some conditions in another. That causes important
state problems in SMP as multiple tasks may be passing by thread-related
functions at the same time.

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