Is the Peer Manager's use of FDS Threadsafe?

[Dave_couling]

I'm using the default implementation of the Peer Manager module.  I see under the hood it uses the FDS module to handle Flash Write/Reads.  If I wanted to implement some Flash storage in my application code using FStorage or FDS, within a freeRTOS architecture there is the possibility of two things trying to use the FDS module at the same time.  Therefore I gotta ask the question, is the Peer Manager thread safe in its use of FDS?  Otherwise I need to use the Peer Manager callback and BLE state changes to drive my application use of FDS.  Thanks for your help.

-DC

[Hung Bui]

Hi,

FDS has not been tested with FreeRTOS and it's not threadsafe. There is actually a define FDS_THREADS to active the critical section inside FDS to avoid the process being interrupted but it's not tested in FreeRTOS. 

Our suggestion is to use both FDS_THREADS and your own semaphore to limit to one transaction at a time. 

[StefXinet]

Dear Hung,

we are experiencing the same issue. we use SDK 17.0.2, BLE and FreeRTOS.

We started writing a library based on the "flash_fds" example but if we also use the peer manager there issue with the  fds_evt_handler (). It's crappy.

Where do you suggest to insert the semaphores in the code?