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A comment on Why Python Is Slow: Looking Under the Hood (2014). Parent comment

Re:Why Python Is Slow: Looking Under the Hood (2014) by retrogradeorbit on Friday July 08, 2016 @04:25AM (#12054214)
Yes, leading to C extensions that are not thread safe and so can't be used in multi-threaded code at all. An example I'm familiar with is pylibmc.
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Re:Why Python Is Slow: Looking Under the Hood (2014) by d0mine on Sunday July 10, 2016 @03:47PM (#12066970)
Wrong. GIL does NOT necessarily make your Python/C code thread-safe and in reverse releasing GIL does not prevent you from writing a thread-safe code.
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