Blocking Boost Asio Worker Threads?

It really depends what you mean by grief. Performing long running operations in a handler invoked by an io_service can block additional handlers from being invoked by the io_service . Consider the simplest example with a single thread invoking io_service::run() .

If the handler invoked by an asynchronous operation, say async_read() then performs some database operations that could be long running, additional outstanding asynchronous operations will not have their handlers invoked until the long running operation is complete and the handler returns control to the io_service .

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