GIT is a version control system that is used for software development and other version control tasks. As a distributed revision control system it is aimed at speed, data integrity, and support for

shared_ptr s1: control_block: atomic ref_count = 1; … control_block* ctrl; T12 Daniel Anderson -- danielanderson.net std::shared_ptr (the basics) T* ptr; shared_ptr s1: control_block: control_block* shared_ptr s2: control_block* ctrl; atomic ref_count = 2; …13 Daniel Anderson -- danielanderson.net std::shared_ptr (the basics) control_block: T T* ptr; control_block* ctrl; atomic … shared_ptr s2:14 Daniel Anderson -- danielanderson.net std::shared_ptr (the basics) control_block: T atomic ref_count = 0; …15 Daniel Anderson -- danielanderson.net std::atomic16

 [[likely]] and [[unlikely]]  Calendars & Timezones  std::span  Feature Test Macros  <version>  Immediate Functions – consteval  constinit  Class Enums and using Directive  Text Formatting all C++ headers are “importable”, e.g.  import <version>;  Everything in <version> is exported, including macros  Improves build throughput; <version> will be processed only once  Comparable to precompiled September 15 • 13:30Concurrency Changes35 Atomic Smart Pointers  Is shared_ptr thread safe?  Yes: control block manipulation thread safe  guarantees object is deleted exactly once  No: accessing pointer

microbenchmarking. • 2020: One user: High frequency of retiring objects. Unsharded list grew out of control. • 2020: Sharded cohorts without reclamation under lock. Fast. Scalable. Robust. Quasi-Synchronous com/facebook/folly under folly/synchronization/Hazptr.h  Working Draft, Extensions to C++ for Concurrency Version 2 (wg21.link/n4895).  Hazard Pointers: Safe Memory Reclamation for Lock-Free Objects, IEEE Transactions Hazard Pointers – Maged Michael Watch CPPCON 2021 Talk on Concurrency TS2 The Upcoming Concurrency TS Version 2 for Low-Latency and Lockless Synchronization (with Paul McKenney and Michael Wong)

implement it • We read post-2018 leap seconds from a Windows registry • SYSTEM\CurrentControlSet\Control\LeapSecondInformation • For pre-2018 leap seconds, we maintain a static constexpr table to pull from the time zone database. • Specifically, it contains data members: • string version; • vector zones; • vector links; • vector leap_seconds;

std::shared_ptr(block) Control Block T T T T T …my::shared_ptr Control Block T T T T T T … int ref_cnt; int size; my::shared_ptr(block)I will write it myself ™ Control Block T T T T T T … templatecontrol block // Cast and initialize each T // return my::shared_ptr(block); } // FixMe: What

done_as_error(sender, error) → sender … commutes the done signal into an error.19 SENDER/RECEIVER CONTROL FLOW20 BASIC LIFETIME OF AN ASYNC OPERATION SCHEDULER schedule SENDER Implementation details STRUCTURED PROGRAMMING Structured control flow constructs have a single entry and a single exit, permitting them to be treated like a black box. goto is an unstructured control flow construct conditional checks if there is a pending completion. If so, it completes it. The constructor registers the control handler, and the destructor unregisters it.104 [[nodiscard]] auto event() const; }; auto c

chain • Pros • Iptables is widely adopted in popular Linux distributions • Cons • O(N^2) in control plane / O(N) in data plane • Poor in scheduling algorithm • Iptables rules are difficult to debug organized in hash table • IPVS DNAT • conntrack/iptables SNAT • Pros • O(1) time complexity in control/data plane • Stably runs for two decades • Support rich scheduling algorithm • Cons • Performance

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(std::size_t j = 0; j < m; ++j) y[i][j] = x[i][j] + y[i][j]; } Libraries Not Under Your Control 39 |4.2.3.17. --expt-relaxed-constexpr (-expt-relaxed-constexpr) Experimental flag: Allow host |Questions About constexpr/Execution Space Specifiers? 46 |Return on Investmentstd::pmr • Allows control over allocation of memory necessary for access by GPU. • May improve performance of your CPU code