global variables access violation between SWI and Tasks

Tim xu

Folks,

I need to update a set of global variables within one of software interrupt routinue and two tasks, as the SWI has higher priority over tasks,

access violation occurs when the task is updating the global variables, and unfortunately it is preempted by SWI. I know LCK module in

DSP/BIOS is a good mechanism, but the document said LCK_pend/LCK_post should not be called from a SWI. Have anyone ran into

same situation and how do you get it through?

Thanks

Tim

0 David Friedland over 15 years ago

Tim,

Have you looked at simply disabling SWIs (using SWI_disable) during the critical operations within the tasks?

Dave

0 Tim xu over 15 years ago in reply to David Friedland

David,

Understand that SWI_disable will disable SWI and other tasks from running, thus avoid data access confliction.

Well, the concerns is do we lost SWI if the the HWI calls SWI_post to activate the SWI, but it was disabled at that

time? That is un-acceptable for my application.

Thanks

Tim

0 David Friedland over 15 years ago in reply to Tim xu

No, the posted Software Interrupt is not "lost", but just deferred.

0 Tim xu over 15 years ago in reply to David Friedland

Great, thanks, it answers my question

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