From Eager Futures/Promises to Lazy Continuations Evolving an Actor Library Based on Lessons Learned from Large-Scale Deployments Benjamin Hindman @benh CppCon 2021prologue ● past life at UC whether local or distributed“actors” in C++ many actor libraries are based on low-level message-passing “send/receive” struct MyActor : public Actor { void Receive(ActorId sender, Message message, MESSAGE_BAR_REQUEST: ... } } };“actors” in C++ many actor libraries are based on low-level message-passing “send/receive” struct MyActor : public Actor { void Receive(ActorId sender, Message message,

graph *ABFS of that graph gives each actor a“Bacon number” *，Unfortunately the co-star graph doesn't actually exist *1IMDB: *。Movies table 。Actors table *。 Movies-Actor table Anti-Pattern atd: :vectorcstd: other instead of themselves ndex Adiaceney List <0> Bipartite Graphs ndex Adijacency List <0> Actor-movie | Library provided Index Adjacency List 悦.5 忆 刁.Ji 了 Six Degrees of Kevin Bacon (IMDB version)

hacker who is trying to help the recipient, but it is also possible that the sender is a malicious actor who is trying to trick the recipient into clicking on a malicious link or downloading a malicious hacker who is trying to help the recipient, but it is also possible that the sender is a malicious actor who is trying to exploit the bug for their own gain. **Conclusion:** Based on the above factors, the

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the Concurrency TS cplusplusconcurrencyinaction.comJust::Thread Pro just::thread Pro provides an actor framework, a concurrent hash map, a concurrent queue, synchronized values and a complete implementation

• Seriously: channels or actors? • 1) One channel full duplex • 2) Two channels, one for each “actor” (endpoint) 57Our simplified communication struct Comm { Comm(SQ& forSending, SQ& forReceiving);

currently in use std::list pos_waiters; // waiters for pos UserPerm actor_perms; // perms I opened the file with Readahead readahead; // file lock std::unique_ptr

offset and the callback returns an arbitrary valuePrintNightmare & Russia State-Sponsored Threat Actor CVE-2021-1675 and CVE-2021-34527 • Remote code execution in Windows Print Spooler • Privilege escalation

concurrent programming 37 Concurrent Programming Reference to American movie Jerry Maguire in which actor Tom Cruise yells “Show me the money” loudly into the phone to win a deal.Concurrency Mechanism -

send � � � � � � � � � � � � � � � � � � � � � � � � • select! is also often used in a loop in ”actor” architectures, where a task reacts to events in a loop. That has some pitfalls, which will be discussed ; { { • � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � ) actor pattern ( � � � � � � � � � . � � � � � � � � � � � � � � � select ! � � � � � � � � � � � � � � �