The Main Points of C++ Misha4.2 Point4.2 Point, as in:1. Just one point (dot) 3-4 .1. Just one point (dot) • In floating-point literals 4.2 .2 4. followed by suffix or exponent (e or p) .1. Just access operators • Member of object • Pointer to member of object • In module names export module Main.SubM.SubSubM; “Dots have no intrinsic meaning, however they are used informally to represent hierarchy

The Goal - A Process of Ongoing Improvement Plot Summary Alex Rogo is a harried plant manager working ever more desperately to try improve performance. His factory is rapidly heading for disaster part spends waiting for a resource, while the resource is preparing itself to work on the part ● Process time - the amount of time the part spends being modified into a new, more valuable form ● Queue bottlenecks. If we reduce batch sizes by half, we also reduce by half the time it will take to process a batch. That means we reduce queue and wait by half as well. Reduce those by half, and we reduce

process_file(...) pool.run() _clone … … process_file(...) pool.run() _clone … … process_file(...) pool.run() _clone … … Stack Traces for Async Code are Unhelpful Threadpool threads: #0 process_file(...) #5 pool.run() #10 __clone … … IO Thread: #0 async_read_some_at(...) #3 ctx.run() #5 __clone … … Main thread: #0 unifex::sync_wait( unifex::sync_wait(...) #4 main() #7 __libc_start_main() … …What would be better? Threadpool threads: #0 process_file(...) #5 pool.run() #10 … IO Thread: … #0 async_read_some_at(

right time.Missed deadlines Real-time programmingReal-time code in C++ Real-time programmingvoid process (float * audio) { // You have 11.6 ms from now, GO!!!! ... }void dispatch (Data& audio) ... } 🚨void dispatch() { x = make_unique(); ... } 🚨Sometimes it’s hiddenvoid process_audio() { numbers_[1] = 2; ... } 🤔void dispatch() { auto const x = input_array(); post_report([x, y](auto & data) { data.input = x; data.output = y; }); } 🤔void process_audio() { fftw_execute(plan); ... } 🤔How can we be confident that our code is real-time

building blocks of VirtualBox . . . . . . . . . . . . . . . . . . . 17 1.2 Two guises of the same “Main API”: the web service or COM/XPCOM . . . . . . 18 1.3 About web services in general . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 327 11 License information 328 12 Main API change log 329 12.1 Incompatible API changes with version 4.2 . . . . . . . . . . . . . . . . virtual graphics device. Live Migration and Resource Monitor are additional modules currently in the process of being added to VirtualBox. What is primarily of interest for purposes of the SDK is the API layer

Application([ (r"/", MainHandler), ]) async def main(): app = make_app() app.listen(8888) await asyncio.Event().wait() if __name__ == "__main__": asyncio.run(main()) This example does not use any of Tornado’s Python web frameworks. It is not based on WSGI, and it is typically run with only one thread per process. See the User’s guide for more on Tornado’s approach to asynchronous programming. While some support supported or recommended for pro- duction use. Some features are missing on Windows (including multi-process mode) and scalability is limited (Even though Tornado is built on asyncio, which supports Windows

building blocks of VirtualBox . . . . . . . . . . . . . . . . . . . 19 1.2 Two guises of the same “Main API”: the web service or COM/XPCOM . . . . . . 20 1.3 About web services in general . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 363 11 License information 364 12 Main API change log 365 12.1 Incompatible API changes with version 4.3 . . . . . . . . . . . . . . . . virtual graphics device. Live Migration and Resource Monitor are additional modules currently in the process of being added to VirtualBox. What is primarily of interest for purposes of the SDK is the API layer

building blocks of VirtualBox . . . . . . . . . . . . . . . . . . . 21 1.2 Two guises of the same “Main API”: the web service or COM/XPCOM . . . . . . 22 1.3 About web services in general . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 405 12 License information 406 13 Main API change log 407 13.1 Incompatible API changes with version 5.x . . . . . . . . . . . . . . . . virtual graphics device. Live Migration and Resource Monitor are additional modules currently in the process of being added to VirtualBox. What is primarily of interest for purposes of the SDK is the API layer

building blocks of VirtualBox . . . . . . . . . . . . . . . . . . . 21 1.2 Two guises of the same “Main API”: the web service or COM/XPCOM . . . . . . 22 1.3 About web services in general . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 404 12 License information 405 13 Main API change log 406 13.1 Incompatible API changes with version 5.x . . . . . . . . . . . . . . . . virtual graphics device. Live Migration and Resource Monitor are additional modules currently in the process of being added to VirtualBox. What is primarily of interest for purposes of the SDK is the API layer