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Update:<br>
<br>
After some heavy lifting I have more or less isolated the resultant
crash to always occur here:<br>
<br>
taskletobject.c<br>
--------------<br>
<br>
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<![endif]-->void<br>
slp_current_insert(PyTaskletObject *task)<br>
{<br>
PyThreadState *ts = task->cstate->tstate;<br>
PyTaskletObject **chain = &ts->st.current;<br>
<br>
SLP_CHAIN_INSERT(PyTaskletObject, chain, task, next, prev);<br>
++ts->st.runcount;<br>
}<br>
<br>
<br>
due to 'task' being in a bad (but not generic memory corrupted, at
least it doesn't look like it) state. task->cstate is null, as are
next/prev.. refcnt is 4 and recursion depth is 1.. yeah few more
crashes it always looks about that way.<br>
<br>
BUT if I amend worker to look like this:<br>
<br>
worker()
<br>
{
<br>
// blah blah wait on queue and get a job and do some work
waiting for awhile (or returning immediately)
<br>
<br>
EnterCriticalSection( &stacklessLock ); // do not risk
access to a thread-unsafe (apparently) API<br>
while( !PyTasklet_Paused(request->task) ) // prevent race
(deadlock if this runs before the _Schedule call)
<br>
{
<br>
Sleep(0); // yield
<br>
}
<br>
<br>
Sleep(2); // LOSE THE RACE<br>
PyTasklet_Insert( request->task );
<br>
LeaveCriticalSection( &stacklessLock );<br>
}
<br>
<br>
it works, 5000 tasklets running full speed with 16 worker threads, all
busy (no logging or anything, just pounding the interface) the mutex I
should have put in to begin with, but the Sleep(2); is also critical it
seems.<br>
<br>
No way I'm leaving it that delicate.<br>
<br>
So question is, what do I need to lose the race to? I am up to my
armpits in stackless code, have tried some pretty ghastly things, such
as adding a global flag that is set during the initial _Schedule()
until it is released at the end of slp_transfer.. really figured that
would work but it didn't. I'll keep plugging away but if any
brainstorms thunder down please let me know.<br>
<br>
<br>
On 6/10/2010 11:46 AM, Chris wrote:
<blockquote cite="mid:4C1108D2.5090501@northarc.com" type="cite">I must
be doing something silly and wrong, hopefully I can get some help from
this list. I am writing a blocking call in the c api which is serviced
by a [pool] of other threads, of course when the call is made I want to
let stackless continue processing, so I did this, which works great:
<br>
<br>
<br>
PyObject* getData(PyObject *self, PyObject *args)
<br>
{
<br>
// blah blah construct request on the heap
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request->task = PyStackless_GetCurrent();
<br>
queueRequest( request ); // this will get picked up by the thread
pool
<br>
PyStackless_Schedule( request->task ); // away it goes back into
python-land
<br>
<br>
Py_DECREF( request->task ); // if we got here its because we
were woken up
<br>
<br>
// blah blah construct response and return
<br>
}
<br>
<br>
<br>
The thread pool does this:
<br>
<br>
<br>
worker()
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{
<br>
// blah blah wait on queue and get a job and do some work
waiting for awhile (or returning immediately)
<br>
<br>
while( !PyTasklet_Paused(request->task) ) // prevent race
(deadlock if this runs before the _Schedule call)
<br>
{
<br>
Sleep(0); // yield
<br>
}
<br>
<br>
PyTasklet_Insert( request->task );
<br>
}
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<br>
<br>
This works just fine. Until I stress it. this program from python
crashes instantly in unpredicatbale (corrupt memory) ways:
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<br>
import stackless
<br>
import dbase
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<br>
def test():
<br>
while 1:
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dbase.request()
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<br>
for i in range( 10 ):
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task = stackless.tasklet( test )()
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while 1:
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stackless.schedule()
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<br>
<br>
BUT if I change that range from 10 to 1? runs all day long without any
problems. Clearly I am doing something that isn't thread safe. but
what? I've tried placing mutexes around the PyTask_ calls but since
schedule doesn't normally return thats not possible everywhere, If I
add Sleep's it helps, in fact if I make them long enough it fixes the
problem and all 10 threads run concurrently.
<br>
<br>
I assume PyTasklet_Schedule()/_Insert() are meant to be used this way,
(ie- multiple threads) can anyone tell me which stupid way I have gone
wrong?
<br>
<br>
<br>
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<br>
</blockquote>
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