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Altera_Forum
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20 years ago

mutex for multiprocessors with multi memories

Hi also if i have flash and sdram and sram connected to multiprocessors(shared memory) can i manage them with one single mutex or do i need to have mutliple mutexes for each of the shar...
Altera_Forum's avatar
Altera_Forum
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20 years ago

You need one mutex per subsystem you wish to control access to. By "subsystem," I mean any set of peripherals which work together. It could be a single register, or a memory block, some UARTs, or whatever.

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originally posted by prasad_forums@Oct 21 2005, 07:54 AM

means i want to have single mutex control for all the memories

shared by the processors

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There you go; one mutex. This means that only one CPU can access any of the memories at a single time.

Bear in mind that the Avalon Bus Module knows nothing of your mutexes. It's not going to put a CPU into wait states if that CPU decides to skip the mutex and use the memory directly.