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View Code? Open in Web Editor NEWEfficient in-process pub/sub pattern for C++
License: MIT License
Efficient in-process pub/sub pattern for C++
License: MIT License
Hi, thank you for writing this inspiring piece of code!
I have a question about the concurrency handling in the shout() function. To my understanding in the current implementation concurrent shout() calls that happen while the invoke-loop is being executed get silently ignored. Did I understand the code correctly? What is the rationale behind this design? Please see below the code of shout() with my comments:
template<class T, class ... T_args>
std::enable_if_t<std::is_same<T_message, T>::value>
shout(T_args && ... args) {
std::list<typename T_message::handler> handlers;
{
std::lock_guard guard{ mutex };
handlers.swap(this->handlers);
// this->handlers is now empty
}
// if shout() gets called by another thread now, the call will do nothing
// because this->handlers is empty
for(auto &handler : handlers) {
std::invoke(handler, std::forward<T_args>(args) ...);
}
{
std::lock_guard guard{ mutex };
handlers.splice(handlers.end(), this->handlers);
this->handlers.swap(handlers);
// calling shout() will have effect again, as this->handlers has been restored
}
}
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