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The Java HashMap class is not synchronised (and that is explicitly… - 'Twas brillig, and the slithy toves did gyre and gimble in the wabe

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Thomas

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[Thursday 21st July 2011 at 11:21 pm]

Thomas

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The Java HashMap class is not synchronised (and that is explicitly documented). This results in... interesting behaviour if two or more threads try to modify a HashMap at the same time.

Apparently, one of the failure modes is for the put() method to get stuck in an infinite loop.

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Comments:

From:

olego
Friday 22nd July 2011 at 2:06 am (UTC)

It's easier in C++: since nothing is synchronised, you shouldn't be surprised when you get strange multi-threaded behaviour. That's why we use tons of locks.

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