Hi All,
We create our customised manager which will fork child process with
baseManager. Because we registered SIGCHLD to reap the zombie for manager, we
found this causes baseManager raise RemoteError when called twice.(Test script
attached.)
After look at baseManager.py we found recv() in handling the request has been
interrupted by comming SIGCHLD, not retry recv(), but raise to client side
directly.
try:
methodname = obj = None
request = recv()<------------------this line been interrupted
by SIGCHLD
ident, methodname, args, kwds = request
obj, exposed, gettypeid = id_to_obj[ident]
if methodname not in exposed:
raise AttributeError(
'method %r of %r object is not in exposed=%r' %
(methodname, type(obj), exposed)
)
function = getattr(obj, methodname)
try:
res = function(*args, **kwds)
except Exception, e:
msg = ('#ERROR', e)
else:
typeid = gettypeid and gettypeid.get(methodname, None)
if typeid:
rident, rexposed = self.create(conn, typeid, res)
token = Token(typeid, self.address, rident)
msg = ('#PROXY', (rexposed, token))
else:
msg = ('#RETURN', res)
except AttributeError:
if methodname is None:
msg = ('#TRACEBACK', format_exc())
else:
try:
fallback_func = self.fallback_mapping[methodname]
result = fallback_func(
self, conn, ident, obj, *args, **kwds
)
msg = ('#RETURN', result)
except Exception:
msg = ('#TRACEBACK', format_exc())
except EOFError:
util.debug('got EOF -- exiting thread serving %r',
threading.current_thread().name)
sys.exit(0)
except Exception:<------does not handle IOError,INTR here should
retry recv()
msg = ('#TRACEBACK', format_exc())
REF: http://bugs.python.org/issue17097
import sys
import os
from time import sleep
import signal
from multiprocessing import Process
from multiprocessing.managers import BaseManager
import threading
class _SuperVdsmManager(BaseManager):
pass
def func():
return 'func'
class _SuperVdsm(object):
def runChild(self):
proc = Process(target=func)
proc.start()
proc.terminate()
def _zombieReaper(signum, frame):
print "sigchld!"
def startSuper():
try:
address = '/home/lvroyce.sock'
if os.path.exists(address):
os.unlink(address)
signal.signal(signal.SIGCHLD, _zombieReaper)
try:
manager = _SuperVdsmManager(address=address, authkey='abc')
manager.register('instance', callable=_SuperVdsm)
server = manager.get_server()
servThread = threading.Thread(target=server.serve_forever)
servThread.setDaemon(True)
servThread.start()
while servThread.isAlive():
servThread.join(5)
except:
raise
finally:
if os.path.exists(address):
os.unlink(address)
except Exception:
sys.exit(1)
def main():
sv = Process(target=startSuper)
sv.start()
sleep(2)
_manager = _SuperVdsmManager(address='/home/lvroyce.sock',
authkey='abc')
_manager.register('instance')
_manager.connect()
_svdsm = _manager.instance()
_svdsm.runChild()
sleep(4)
_svdsm.runChild()
if __name__ == '__main__':
main()
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