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DPI Calls

Hi, I have a question regarding DPI calls. I read that always_ff is modelled as a thread. so If I have two always_ff calling the same DPI function on same clk, will it behave like multithread on C/CPP side? I ask this to know If have to do thread safe.

StephenH over 2 years ago

SV always / always_ff / always_comb are modelled as parallel processes, but in reality event-driven simulation is single-threaded by nature and the simulator kernel takes care of the SV process "threading" for you, it does not use OS threads for this. Thus your DPI-C code will not have to worry about being thread-safe in a SV simulation.
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pradeep14JP over 2 years ago in reply to StephenH

what about emulation? no need to worry on emulation too?
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StephenH over 2 years ago in reply to pradeep14JP

Not normally because the emulator interfaces to the user via the same simulator kernel.
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pradeep14JP over 2 years ago in reply to StephenH

Thanks Stephen, any link or reference to read about the same?
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StephenH over 2 years ago in reply to pradeep14JP

Well, login to support.cadence.com and you'll find a ton of material about how DPI works in simulation and emulation...
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