Fix signal handler

SF Markus Elfring elfring at
Sat Sep 29 13:00:13 CEST 2012

>> 2. Would it eventually need to be protected by a mutex (from the
>>    multi-threading perspective)?
> Using a mutex in a signal handler is neither conforming nor working in
> practise, so far worse than the current approach.

I find it interesting that the statements "ECB_MEMORY_FENCE_ACQUIRE" and
"ECB_MEMORY_FENCE_RELEASE" were added recently.


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