On Sun, Feb 21, 2010 at 3:55 PM, Fabio Zadrozny <fab...@esss.com.br> wrote:
>
> Actually, Pydev should already trigger debugging in any thread (it
> sets the threading.settrace to do that).
Yeah, but some code uses thread.start_new_thread directly, which is
something not handled by
> I believe django creates a separate process to do that, which is the
> reason the remote debugger must used for debugging django (a version
> without the reload feature should already work for all threads).
True, but that's the behavior of Django under CPython.
Under Jython it doesn't start a new process, but a new thread. The
thread is started using thread.start_new_thread though, which makes it
untraceable.
> What could be done is that the remote debugger is started and each new
> process calls pydevd.settrace(suspend=False, traceAllThreads=True),
> where traceAllThreads is a flag that is still not implemented, which
> calls threading.settrace(debugger.trace_dispatch) for all new threads
> -- not only the pydevd_tracing.SetTrace(debugger.trace_dispatch) --
> and maybe pass the sys._current_frames to set the tracing for existing
> threads.
>
> If you think that'd be useful, I can create that option...
Actually, I discovered that the whole thing won't be useful for my use
case (debug the Django dev server under Jython with autoreloading
enabled). Unfortunately the debugger connection will be lost when the
reloading takes place (as it reloads the whole interpreter).
However, here is a use case:
1. You have the following program in PyDev:
import thread
def hello(name):
print "Hello", name
thread.start_new_thread(hello, ("World",))
2. You put a debugger marker on the print line.
3. You debug the program, but it never stops. Nor on CPython nor Jython.
The fix/hack consisted on the following code (with
self.monkeyPatchThread() being invoked after threading.settrace(), in
PyDB.run()):
def monkeyPatchThread(self):
import types
try:
import thread
except:
import _thread as thread # Python 3
original_start_new_thread = thread.start_new_thread
def patched_start_new_thread(func, *args, **kwargs):
def patched_func(*args, **kwargs):
import sys
pydevd_tracing.SetTrace(self.trace_dispatch)
func(*args, **kwargs)
original_start_new_thread(patched_func, *args, **kwargs)
if self.isJythonClassModule(thread):
thread.start_new_thread = staticmethod(patched_start_new_thread)
else:
thread.start_new_thread = patched_start_new_thread
def isJythonClassModule(self, module):
try:
from java.lang import Class
except:
return False
else:
return isinstance(module, Class)
But it only works correctly with Jython. With CPython it hits the
debugger but then somehow the connection is lost.
I'm probably not pushing this forward (since it won't work for the
Django server use case), but anyway, that's the code if anyone is
interested.
--
Leo Soto M.
http://blog.leosoto.com
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