Hielke de Vries frevib

Software developer and Security engineer

frevib / socket_create.c

Last active January 27, 2020 11:51

	// create socket
	int sock = socket(...);

	// send bytes to the socket
	send(sock, buffer, ...);

	// receive bytes from the socket
	recv(sock, buffer, ...);

frevib / non-blocking_call.kt

Last active January 27, 2020 19:40

	HTTP.get("https://ing.com")
	// execution continues without delay

	foo()

frevib / blocking_call.kt

Last active January 26, 2020 20:00

	val response = HTTP.get("https://ing.com")
	// wait 30 ms

	foo()

frevib / event_loop.c

Created January 26, 2020 19:59

	while(1) {

	// check all sockets for ready data

	}

frevib / event_loop_epoll.c

Last active January 27, 2020 20:47

	// many_sockets you want to monitor
	epoll_ctl(many_sockets);

	while(1) {

	// blocks if there are is no ready data
	int events = epoll_wait(many_sockets)

	// handle_events

frevib / event_loop.kt

Created January 21, 2020 10:05

	while(true) {

	// check if there is data available in the socket

	}

frevib / sequential_execution.asm

Last active January 20, 2020 20:17


	global _start

	section .text
	_start: mov rax, 1 ; system call for write
	mov rdi, 1 ; file handle 1 is stdout
	mov rsi, message ; address of string to output
	mov rdx, 13 ; number of bytes
	syscall ; invoke operating system to do the write
	mov rax, 60 ; system call for exit

frevib / blocking_call.kt

Last active January 20, 2020 19:25

	fun requestUrl() {

	// call network IO
	val response = Http.get("https://ing.com")

	// wait until response has returned...
	processResponse(response)

	// continue execution
	foo()

frevib / non-blocking_call.kt

Last active January 20, 2020 19:29

	fun requestUrl() {

	// call network IO
	// when data is ready call .success()
	Http
	.get("https://ing.com")
	.success((response) -> print(response.data))

	// continue execution
	foo()

frevib / event_loop_outline.cpp

Last active November 2, 2019 19:24

	while(true) {
	// check if one of the sockets in your "interest list" has ready data.
	// This call will block if there is no ready data.
	int amount_of_new_events = kqueue(events_to_check, new_events, ...)

	// When there is ready data in at least one file descriptor, execution continues
	// and all the events in `new_events` is checked.
	for (int i = 0; i < amount_of_new_events; i++) {
	Event event = new_events[i]