Re: [Valgrind-users] Execution of a dirty helper: atomic?

[John R. <jr...@bi...>]

On 12/28/2012 07:57 AM, Julian Seward wrote:
> 
>> I mean "atomic" in the sense of "no thread switching/interleaving".
> 
> In that case, yes it is atomic.  That is, V will not switch threads 
> within a superblock.  It can only switch threads at superblock boundaries.To
Today this is true.  However, there are serious investigations and efforts
into making coregrind/memcheck multi-threaded.  One likely candidate
will allow multiple simultaneous threads on multiple CPU cores.
Each CPU core may switch logical threads only at a superblock boundary,
but mutual exclusion between threads on different CPU cores is not guaranteed.
For some purposes this will look like "interleaving".

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