Bugs item #1739118, was opened at 2007-06-18 23:43
Message generated for change (Comment added) made by ocean-city
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Category: Threads
Group: Python 2.6
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Hirokazu Yamamoto (ocean-city)
Assigned to: Nobody/Anonymous (nobody)
Summary: Investigated ref leak report related to thread(regrtest.py -
Initial Comment:
Hello. I investigated ref leak report related to thread.
Please run python regrtest.py -R :: test_leak.py (attached file)
Sometimes ref leak is reported.
# I saw this as regression failure on python-checkins.
# total ref count 92578 -> 92669
_Condition 2
Thread 6
_Event 1
bool 10
instancemethod 1
code 2
dict 9
file 1
frame 3
function 2
int 1
list 2
builtin_function_or_method 5
NoneType 2
str 27
thread.lock 7
tuple 5
type 5
Probably this happens because threading.Thread is implemented as Python
code,
(expecially threading.Thread#join), the code of regrtest.py
if i >= nwarmup:
deltas.append(sys.gettotalrefcount() - rc - 2)
can run before thread really quits. (before Moudles/threadmodule.c
t_bootstrap()'s
Py_DECREF(boot->func);
Py_DECREF(boot->args);
Py_XDECREF(boot->keyw);
runs)
So I experimentally inserted the code to wait for thread termination.
(attached file experimental.patch) And I confirmed error was gone.
# Sorry for hackish patch which only runs on windows. It should run
# on other platforms if you replace Sleep() in Python/sysmodule.c
# sys_debug_ref_leak_leave() with appropriate function.
----------------------------------------------------------------------
>Comment By: Hirokazu Yamamoto (ocean-city)
Date: 2007-06-19 02:48
Message:
Logged In: YES
user_id=1200846
Originator: YES
Sorry, I updated the patch. Moved
fprintf(stderr, "================= thread leave\n");
current_thread_count--;
in threadmodule.c just before PyThread_exit_thread().
File Added: archive.zip
----------------------------------------------------------------------
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