Discussion
Consider the following statements about queues.
1. A queue copies the message by default 2. A send with a zero timeout may fail 3. A queue removes the need for any synchronisation between the tasks
Answer: C
Copying and the possible failure of a non-blocking send are both correct. A queue is itself the synchronisation, and it removes the need for locks only for the data it carries: anything else the tasks share still needs protecting.
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