New issue 3003: Unable to launch pdb from subprocess reader thread
https://bitbucket.org/pypy/pypy/issues/3003/unable-to-launch-pdb-from-subprocess
Andrew Lawrence:
While attempting to debug SpawnCmdLineTest.test_basic_script I placed a call to
pdb inside the readerthread in subprocess.py
def _readerthread(self, fh, buffer):
import pdb; pdb.set_trace()
buffer.append(fh.read())
fh.close()
When running the test both reader threads used to communicate with the
subprocess raised the following exception:
Exception in thread Thread-2:
Traceback (most recent call last):
File "C:\pypy\lib-python\3\threading.py", line 916, in _bootstrap_inner
self.run()
File "C:\pypy\lib-python\3\threading.py", line 864, in run
self._target(*self._args, **self._kwargs)
File "C:\pypy\lib-python\3\subprocess.py", line 1083, in _readerthread
buffer.append(fh.read())
File "C:\pypy\lib-python\3\bdb.py", line 48, in trace_dispatch
return self.dispatch_line(frame)
File "C:\pypy\lib-python\3\bdb.py", line 66, in dispatch_line
self.user_line(frame)
File "C:\pypy\lib-python\3\pdb.py", line 261, in user_line
self.interaction(frame, None)
File "C:\pypy\lib-python\3\pdb.py", line 344, in interaction
signal.signal(signal.SIGINT, Pdb._previous_sigint_handler)
File "C:\pypy\lib-python\3\signal.py", line 47, in signal
handler = _signal.signal(_enum_to_int(signalnum), _enum_to_int(handler))
ValueError: signal only works in main thread or with __pypy__.thread.enable_sign
als()
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