This is the mail archive of the
ecos-discuss@sources.redhat.com
mailing list for the eCos project.
Re: Task switching problem
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
--
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss