I need some help of creating shared ddr sdram memory

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You'll need to use Dekker's algorythm on uncached memory to do any form of inter-cpu synchronisation.

Generating a 'spin lock' is easiest, and, in fact, all the other synchronisation schemes are based on them.

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Hi, dsl, thanks for your reply.

However, Deckker's algorithm is kind of 'busy waiting' or 'spin lock' as you said. What I need is some kind of blocking machinism. Just like then recv() in socket programming , it will block the process. In mailbox, we have pend(). And though it seems that the lock() in Mutex is a blocking rountine, as I said before , it can not be used to coordinate processes.:(