Re: [ECOS] Task switching problem

[Yuriy Coureelo <coureelo@micran.ru>]

Dear Sir!

AL> It looks like you get into trouble at 152, 153. There is a
AL> SCHED_UNLOCK missing.
Let's take a look at the group of lines 152-160
The same situation is at lines 139-147, 66-74, 35-43, but there
everything is ok.

AL> You might also want to enabled more instrumentation calls.
all the instrumentations are enabled

AL> However its hard to tell what is going on here. You could change 
AL> packages/kernel/current/include/sched.inl
AL> CYG_INSTRUMENT_SCHED(LOCK,get_sched_lock(),0);
AL> to
AL> CYG_INSTRUMENT_SCHED(LOCK,get_sched_lock(),__builtin_return_address(0));
AL> and the same with the UNLOCK call. You can then get the address of
AL> what called the lock and unlock functions.
ok, done, got this:

Num Thread Time                    Arg1       Arg2
149 06     0x1d90 SCHED_LOCK       0x00000001 0x020053d4   radiorx_data()
150 06     0x1d96 MUTEX_UNLOCK     0x0211dfc0 0x00000000   radio_mutex
151 06     0x1d9f SCHED_UNLOCK     0x00000001 0x020053d4   radiorx_data()
152 06     0x1db4 SCHED_LOCK       0x00000001 0x020054c4   radioErx_proc()
153 06     0x1dbc SCHED_LOCK       0x00000002 0x0201adbc   _flagwait
154 06     0x1dc3 SCHED_UNLOCK     0x00000002 0x0201adbc   _flagwait
155 06     0x1dcf THREAD_SLEEP     0x0211dfe0 0x00000000   radioErx_thread
156 06     0x1dd6 SCHED_LOCK       0x00000002 0x0201ae3c   _flagwait
157 06     0x1de0 SCHED_UNLOCK     0x00000002 0x0201ae3c   _flagwait
158 06     0x1dea SCHED_RESCHEDULE 0x00000001 0x00000000
159 06     0x1df2 SCHED_RESCHEDULE 0x00000000 0x00000000
160 06     0x1e0f THREAD_SWITCH    0x0211dfe0 0x0208cfe4   radioErx_thread => idle_thread

161 01     0x1e27 INTR_RESTORE     0x00000000 0x00000000
162 01     0x1d72 INTR_MASK        0x00000000 0x00000000
163 01     0x1d7b INT_ACK          0x00000000 0x00000000
164 01     0x1d8a INTR_END         0x00000000 0x00000003
165 01     0x1d91 INTR_POST_DSR    0x00000000 0x00000000
166 01     0x1d99 SCHED_UNLOCK     0x00000002 0x02000538   return_from_exception
167 01     0x1da1 INTR_RESTORE     0x00000000 0x00000000

here all stops, no more messages, processor hangs (?)

Function radiorx_data() works with mutex, unlocks it (...149-151).
Then radiorx_data() returns to radioErx_proc() thread function.
radioErx_proc() begins waiting on flag (152-157), so it's correct
number of SCHED_LOCKs.

Can't understand anything :(((

Sincerely yours
Yuriy Coureelo
------------------------
Engineer
Telecommunication Equipment Division
Micran Company
Tomsk, Russia


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