Hi,
currently, I am a bit confused about the semaphore between rtdev and
stack_mgr: how it is used to synchronize these two?
According to my understanding thus far, the real time task "do_stacktask" is
blocked at decrementing the semaphore, while there is
no packet pending in the rx_queue, which means the semaphore is zero. So
when some packets are received, the rtdev should increment the
semaphore somewhere, but I can not found the piece of code where the
semaphore is incremented. Is my understanding right? Could you give me
some hints? Thx in adv.
The related up operations are performed via rt_mark_stack_mgr by the drivers:
http://www.rts.uni-hannover.de/rtnet/lxr/source/include/stack_mgr.h#L57
What may be confusing is that the rtdev structure holds a pointer to the semaphore stored in the device manager structure. This linking is not really required. RTnet only knows of a single stack manager so far, thus the semaphore could be a global variable as well. We still keep the option of introducing multiple device managers for different interfaces. Might only be useful in very special scenarios, though.
Jan
PS: I picked up your question about a developer list and created [EMAIL PROTECTED] yesterday - after producing a chat-like mail thread with Marc. :)
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