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Can a non synchronized method interleave with a synchronized method?

原文 2022-06-29 04:49:49 6 1 java/ concurrency

When I have a class with a List and two methods operating on that list. A synchronized one that adds an element and later works on that element. And a non synchronized method that deletes elements in that list, could that lead to a race condition in a multi-threaded situation? I would have thought so, but I tested it (with vmlens) and that test suggests, there will be no problem. Maybe I didn't fully understand "synchronized" yet...

1 answers

Your code is suffering from 2 types of problems:

race condition
data race

The race condition could happen when the add and delete are both updating the list and it could lead to eg the size of the list becoming inconsistent with the actual number of items due to an unlucky scheduling of requests.

Because you don't have any synchronization (eg synchronized or volatile) there are no happens-before edges between writing and reading the list. And this can lead to all kinds of problems like reordering, and visibility (and atomicity) problems. For more information about data races, it is best to dig into the Java Memory Model .

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Can a non synchronized method interleave with a synchronized method?

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1 answers

solution1 0 2022-06-30 03:19:34

solution1
0 2022-06-30 03:19:34