mutex for multiprocessors with multi memories

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originally posted by mike desimone@Oct 21 2005, 11:24 AM

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[/b]

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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.

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[/b]

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Hi Mike,

so in that case i need to have multiple mutexes

suppose i want to have sram and sdram being shared.

in that case if i have 2 mutexes and i can use them

independently .i.e i can write into sram from cpu0 using one mutex

and also into sdram using cpu1 concurrently .they can go independently.

correct me if i am wrong.then how to take care which mutex corresponds

to which shared resource????is it hardware or software.

i mean ask that how to throw mutex and lock the particular memory only?

regards

prasad