En Sun, 26 Oct 2008 23:25:09 -0200, Alcari The Mad
<[EMAIL PROTECTED]> escribió:
I am confused about which data structure to rely on thread-safety, or
operator in Python?
All of the builtin functions(which are implemented in C, like len()) are
atomic(but assigning their output to a value may not be).
You can't count on the builtins being atomic. len(x) executes
type(x).__len__ if such method exists, which may execute arbitrary Python
code, even trigger the garbage collector and run absolutely unrelated
things.
See this effbot page for discussion [1] - but in general, since the
language reference doesn't specify whether an operation is atomic or not,
you should not count on it. Use a lock when required.
[1]
http://effbot.org/pyfaq/what-kinds-of-global-value-mutation-are-thread-safe.htm
--
Gabriel Genellina
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