59 lines
2.3 KiB
Org Mode
59 lines
2.3 KiB
Org Mode
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* Talks
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Slides and example code from two technical presentations given in 2020.
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Slides use [[https://orgmode.org/][org-mode,]] and were presented in Emacs with [[https://github.com/rlister/org-present][org-present]].
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** Concurrency (June 2020)
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Introduction to concurrency.
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*** Slides
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- Sequential vs. concurrent execution, I/O latency, interrupts, and cooperative vs. preemptive scheduling
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- Concurrency vs. parallelism, processes vs. threads, and language runtimes (C, JavaScript event loop, Go scheduler)
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- Shared memory synchronization vs. message passing, backpressure, and distributed data races
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*** Examples
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- temperatures: concurrent HTTP requests fetching city temperatures from OpenWeatherMap.
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- mutex: data race demonstration and mutual exclusion on a shared bank account balance (~go run -race ./main.go~).
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- csp: pipeline of goroutines and channels reading a CSV of zip codes, querying weather data with a concurrency limiter, and displaying a live top-ten leaderboard.
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To run the examples:
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#+begin_src shell
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# Mutex example (with and without race detector):
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cd concurrency/cmd/mutex
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go run ./main.go
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go run -race ./main.go
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# Weather examples (require an OpenWeatherMap API key):
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export OPEN_WEATHER_MAP_API_KEY="..."
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cd concurrency/cmd/temperatures && go run .
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cd concurrency/cmd/csp && go run .
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#+end_src
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** x86-64 Assembly (November 2020)
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A brief tour of x86-64 assembly on Linux.
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** Slides
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- Compilation pipeline, ISAs, CPU registers, and Linux system calls
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- Instructions, addressing modes, control flow, and memory safety
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- Virtual memory, the stack, function prologues/epilogues, and the System V AMD64 ABI calling convention
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** Examples
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- exit: minimal program invoking the ~exit~ system call.
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- math: basic arithmetic instructions (~mov~, ~add~, ~sub~, ~mul~, ~div~), inspected via exit status.
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- control-flow: loops, comparisons (~cmp~), and conditional/unconditional jumps (~je~, ~jmp~).
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- hello-world: writing a string from the ~.data~ section to stdout with the ~write~ system call.
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- safety: out-of-bounds memory overwrite across adjacent ~.data~ buffers.
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- stack: pushing bytes onto the stack and printing from ~%rsp~.
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- func: function call, stack frame setup (~%rbp~ / ~%rsp~), and return.
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To run the examples:
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#+begin_src shell
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as exit.s -o exit.o
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ld exit.o -o exit
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./exit
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echo $?
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#+end_src
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