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Altera_Forum
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14 years ago

multiprocessor: Share same variable

Hi , I try to implement a c-code for multiprocessor architecture(3 CPU). I need to know if it is possible that the three processor share the same variable. For example i declare an integer "var...
Altera_Forum's avatar
Altera_Forum
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12 years ago

Hello,

I am also working on implementing mutex for data sharing amongst 4 cores.

I want to share a particular on chip memory address amongst 4 cores.

I included one mutex in my qsys design and using the below code format in my 4 cores:

# ifdef MUTEX_BASE

m1 = altera_avalon_mutex_open( "/dev/mutex");

# endif

if (!altera_avalon_mutex_trylock (m1, ALT_CPU_CPU_ID_VALUE))

{

done0 = IORD(OnChip,1); //On chip memory access

altera_avalon_mutex_unlock (m1);

}

When I run any first core, it runs. When I run any second core, the first core is PAUSED.

Please suggest.