使用boost链和std :: mutex

Question

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They're using stand to guarantee that none of those handlers will execute concurrently.

so, I have 3 threads that calls io_context.run() and which leads them to enter to channel and may have to use vector's push_back at the same time.

Do I have to use a std::mutex to lock push_back function to prevent them call concurrently or it well managed by strand ?

Answer 1

Assuming all of your code is correctly running within the strand then only one thread will be executing your code at a time.

The thread that is executing your code will change between the three threads that are available but only one function will be executing at a time.

You therefore shouldn't need mutexes, this is the part of the idea of using strands as mutexes are difficult to use correctly in asynchronous code.