Message162054
> conn = MySQLConn()
> start_thread1(conn)
> start_thread2(conn):
> while True:
> if os.fork() == 0: # child
> raise Exception('doom') # triggers destructor
There is no guarantee here that the lock will be held at the time of the fork. So even if we ensure that a lock acquired before the fork stayed lock, we won't necessarily get a deadlock.
More importantly, you should never fork without ensuring that you exit with os._exit() or os.exec*(). So your example should be something like
conn = MySQLConn()
start_thread1(conn)
start_thread2(conn):
while True:
if os.fork() == 0: # child
try:
raise Exception('doom') # does NOT trigger destructor
except:
sys.excepthook(*sys.exc_info())
os._exit(1)
else:
os._exit(0)
With this hard exit the destructor never runs. |
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Date |
User |
Action |
Args |
2012-06-01 06:58:59 | sbt | set | recipients:
+ sbt, gregory.p.smith, vinay.sajip, jcea, pitrou, vstinner, nirai, bobbyi, neologix, Giovanni.Bajo, sdaoden, avian, lesha |
2012-06-01 06:58:59 | sbt | set | messageid: <1338533939.6.0.779827783959.issue6721@psf.upfronthosting.co.za> |
2012-06-01 06:58:59 | sbt | link | issue6721 messages |
2012-06-01 06:58:58 | sbt | create | |
|