Need help to explain the test result

Joel Sherrill joel.sherrill at
Sun Jan 10 15:41:03 UTC 2010

On 01/10/2010 09:17 AM, Leon Pollak wrote:
> Hello, all.
> I am trying to do the task switch logger.
> For this I installed the user extension and the function "TASK SWITCH
> Extension", which logs (into cyclic buffer) the current_task->
> Everything seems to work, but I have 2 questions:
> 1. Sometimes I see the name 0x10e150 to appear. Under debugger, I see this
> name when an external interrupt occurs and task switch is called from the ISR
> handler. Strange, as I thought that IRQ has no "task" context. OK, but what is
> this name? I did:
> (gdb) p/x current_task->Object
> p/x current_task->Object
> $59 = {Node = {next = 0x54f410, previous = 0x54f40c}, id = 0x9010001, name =
> 0x10e150}
Some object types have string names.  This is the id of the idle
thread.  I am betting *(char *) 0x10e150 is "IDLE".
> 2. For now, I designated the above as "*IRQ" name and continued. Then, I
> received something that I can not understand:
> *IRQ    MRT2    V2HD    FCr1    FCr1    V2HD    FCr1    FCr1    V2HD    FCr1
> V2HD    FCr1
> How can it be that FCr1 is repeated? There was a context switch to itself!?
Signal? Or a reevaluation?  Hard to say.
> Many thanks for the help.

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