[Mpi3-rma] RMA proposal 1 update
thakur at mcs.anl.gov
Wed May 26 13:13:05 CDT 2010
> > Not just lockall. The user would have to assert that no other
> > will call regular lock with an exclusive lock.
> I believe this would just be da-facto illegal in the current set of
> rules. Because lock-all gives you a shared lock. If anybody
> is trying to acquire an exclusive lock, he would deadlock.
Not necessarily. They can just get serialized. For example
Rank 0 Rank 9
Lockall(shared) Lock(rank 5, excl)
Either rank 0's operations happen first or rank 9's. If rank 0 never
calls unlockall, it is a different story. But that can happen even today
if you do a lock but don't call unlock.
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