Hi!

When we pass a pointer to another thread on multi-core processors the 
receiving thread may have an old copy of the memory place in its cache (am 
I wrong?)

I read the uv_async_send implementations for win and linux but did not 
found memory barriers/fences.

Is it safe to access the memory pointed by the pointer on the other thread 
on multi-core and/or multi-processor computers?

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