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Date of registration: Aug 26th 2010

Posts: 5


Tuesday, January 3rd 2012, 9:43am

emFile integration with embOs

Function FS_X_OS_Init() called from FS_Init. According to description user will need to create four binary semaphores.
Unfortunately it's impossible to change NumLocks parameter of FS_X_OS_Init. it's equal 1 always even FS_OS_LOCKING define is changed for value 2.
Any solution for me ?




Date of registration: Jan 3rd 2012

Posts: 1

Location: UK

Occupation: Development Engineer


Tuesday, January 10th 2012, 1:32pm

Hi, Sohoil.

Thought I would recount to you the behaviour of my system in this respect.

If I build my program using a Multilock version of the File System library. And #define FS_OS_LOCKING as 0 in the file ‘FS_Conf.h’. I see a value of 2 passed into the function FS_X_OS_Init through the argument NumLocks.

If I change the #define to equate FS_OS_LOCKING to 2. I still see a value of 2 passed into the function FS_X_OS_Init through the argument NumLocks.

Sorry I cannot be of more help.



SEGGER - Marius

Super Moderator

Date of registration: Aug 10th 2011

Posts: 32


Thursday, January 19th 2012, 4:30pm


The number of semaphores required is computed by emFile at runtime like this:
- no locking (FS_OS_LOCKING == 0) -> no semaphores
- coarse lock granularity (FS_OS_LOCKING == 1) -> 1 semaphore
- fine lock granularity (FS_OS_LOCKING == 2) -> 1 + <number of drivers> semaphores

When using emFile in library form setting FS_OS_LOCKING has no effect.
The required level of locking can be selected by linking the appropriate library.
This is the reason why emFile requires 2 semaphores even if FS_OS_LOCKING is set to 0.

Best regards,