talks

Sequential vs. concurrent execution, I/O latency, interrupts, and cooperative vs. preemptive scheduling
Concurrency vs. parallelism, processes vs. threads, and language runtimes (C, JavaScript event loop, Go scheduler)
Shared memory synchronization vs. message passing, backpressure, and distributed data races

Examples

temperatures: concurrent HTTP requests fetching city temperatures from OpenWeatherMap.
mutex: data race demonstration and mutual exclusion on a shared bank account balance (go run -race ./main.go).
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.

To run the examples:

# Mutex example (with and without race detector):
cd concurrency/cmd/mutex
go run ./main.go
go run -race ./main.go

# Weather examples (require an OpenWeatherMap API key):
export OPEN_WEATHER_MAP_API_KEY="..."
cd concurrency/cmd/temperatures && go run .
cd concurrency/cmd/csp && go run .

x86-64 Assembly (November 2020)

A brief tour of x86-64 assembly on Linux.

Slides

Compilation pipeline, ISAs, CPU registers, and Linux system calls
Instructions, addressing modes, control flow, and memory safety
Virtual memory, the stack, function prologues/epilogues, and the System V AMD64 ABI calling convention

Examples

exit: minimal program invoking the exit system call.
math: basic arithmetic instructions (mov, add, sub, mul, div), inspected via exit status.
control-flow: loops, comparisons (cmp), and conditional/unconditional jumps (je, jmp).
hello-world: writing a string from the .data section to stdout with the write system call.
safety: out-of-bounds memory overwrite across adjacent .data buffers.
stack: pushing bytes onto the stack and printing from %rsp.
func: function call, stack frame setup (%rbp / %rsp), and return.

To run the examples:

as exit.s -o exit.o
ld exit.o -o exit
./exit
echo $?