Timothy O'Keefe added the comment:
Could you change the dummy function to do something other than simply return
the row? For example:
#!/usr/bin/env python
import sqlite3
import multiprocessing as mp
def main():
## --- create a database
conn = sqlite3.connect(':memory:')
conn.row_factory = sqlite3.Row
c = conn.cursor()
## --- create example table similar to python docs
c.execute('''CREATE TABLE stocks (date text, trans text, symbol text, qty
real, price real)''')
c.execute("INSERT INTO stocks VALUES
('2006-01-05','BUY','GOOG',100,869.29)")
c.execute("INSERT INTO stocks VALUES
('1992-01-06','SELL','AAPL',20,512.99)")
c.execute("SELECT * FROM stocks")
## --- map fun over cursor (fun does little to nothing)
pool = mp.Pool(processes=mp.cpu_count())
rows = pool.map(fun, c)
def fun(row):
_ = len(row)
return row
if __name__ == "__main__":
main()
In this example the code simply hangs. For whatever reason, I can no longer
provoke the segfault.
Regardless, there is something going on. Here are the results from the print
statements you asked for:
2.7.2 (default, Oct 11 2012, 20:14:37)
[GCC 4.2.1 Compatible Apple Clang 4.0 (tags/Apple/clang-418.0.60)]
2.6.0
3.7.12
0.70a1
4
Darwin-12.4.0-x86_64-i386-64bit
I have also tried this on Ubuntu 12.04:
2.7.3 (default, Apr 10 2013, 06:20:15)
[GCC 4.6.3]
2.6.0
3.7.9
0.70a1
4
Linux-3.2.0-24-generic-x86_64-with-Ubuntu-12.04-precise
----------
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue18782>
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