New submission from James Hutchison:
Following code deadlocks on Windows 7 64-bit, Python 3.2.3
If you have a pool issue a map operation over an empty iterable then try to
join later, it will deadlock. If there is no map operation or blah in the code
below isn't empty, it does not deadlock
from multiprocessing import Pool
def main():
p = Pool();
blah = [];
print("Mapping");
p.map(dummy, blah);
p.close();
p.join(); # deadlocks here
print("Done");
def dummy(x):
pass;
if __name__ == "__main__":
main();
----------
components: Library (Lib)
messages: 168408
nosy: Jimbofbx
priority: normal
severity: normal
status: open
title: Multiprocessing Pool deadlocks on join after empty map operation
type: behavior
versions: Python 3.2
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Python tracker <[email protected]>
<http://bugs.python.org/issue15702>
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