What happens if the appcore and the netcore access the same memory at the same time.

[Even Falch-Larsen]

Hi,

We have some variables in shared memory. These variables can be accessed directly by both cores, and this is not controlled through IPC.These variables can be accessed by the cores at random times. Typically these variables are only written from one core and read from the other core. What happens if one core want to read the same variable as another core writes it at the same time?

[Susheel Nuguru]

If they try to access the same memory at the same time, then it is a race condition. There is no implicit hardware protection against that. If you are not using RPC modules or other libraries that are built on top of IPC then you need to implement your own protection against conflicting access of that shared memory from those cores.

[Even Falch-Larsen]

There will not be any hard faults or any other issues with such code if two AHB masters access the same memory at the same time?

[Susheel Nuguru]

It might be possible to have a memfault, since two cores are at same priorities on the AHB bus. I haven't found detailed documentation on that scenario yet.