如何使线程在std :: list上等待值？

Question

I have a typical scenario: Let's say thread A and thread B are going to access std:list. Thread A is going to push an item to list and thread B is going to pop the item from the list.

My question is: How to make thread B wait until there is a data inside the queue.

Answer 1

而不是使用std::list ，你可能希望使用内置的诸如线程安全的容器boost::lockfree::queue或TBB concurrent_queue 。

Answer 2

How to make thread B wait until there is a data inside the queue.

Check out std::condition_variable . With a condition variable, a thread can wait (spin and then sleep) on the variable until a different thread signals on the same variable and wakes up the waiting thread.