Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Extending Ruby with C
Search
Paul Mucur
May 08, 2012
Programming
1
280
Extending Ruby with C
A Learning Lunch presentation about writing C extensions for Ruby.
Paul Mucur
May 08, 2012
Tweet
Share
More Decks by Paul Mucur
See All by Paul Mucur
Do you really need breakfast?
mudge
0
140
HyperLogLog in 15 minutes
mudge
0
310
Exploring #to_proc
mudge
0
230
Testing Vimscript with Vimrunner
mudge
3
230
Configuration Management with Puppet
mudge
1
240
Managing Web Application Servers with Puppet
mudge
3
150
Other Decks in Programming
See All in Programming
管你要 trace 什麼、bpftrace 用下去就對了 — COSCUP 2025
shunghsiyu
0
420
書き捨てではなく継続開発可能なコードをAIコーディングエージェントで書くために意識していること
shuyakinjo
1
280
Webinar: AI-Powered Development: Transformiere deinen Workflow mit Coding Tools und MCP Servern
danielsogl
0
130
AIに安心して任せるためにTypeScriptで一意な型を作ろう
arfes0e2b3c
0
370
Understanding Ruby Grammar Through Conflicts
yui_knk
1
110
decksh - a little language for decks
ajstarks
4
21k
Comparing decimals in Swift Testing
417_72ki
0
170
kiroでゲームを作ってみた
iriikeita
0
170
Amazon Q CLI開発で学んだAIコーディングツールの使い方
licux
3
180
CEDEC 2025 『ゲームにおけるリアルタイム通信への QUIC導入事例の紹介』
segadevtech
3
890
Vibe coding コードレビュー
kinopeee
0
450
なぜ今、Terraformの本を書いたのか? - 著者陣に聞く!『Terraformではじめる実践IaC』登壇資料
fufuhu
4
620
Featured
See All Featured
How GitHub (no longer) Works
holman
314
140k
Measuring & Analyzing Core Web Vitals
bluesmoon
8
560
Speed Design
sergeychernyshev
32
1.1k
Intergalactic Javascript Robots from Outer Space
tanoku
272
27k
Bootstrapping a Software Product
garrettdimon
PRO
307
110k
For a Future-Friendly Web
brad_frost
179
9.9k
Distributed Sagas: A Protocol for Coordinating Microservices
caitiem20
333
22k
Building Flexible Design Systems
yeseniaperezcruz
328
39k
Practical Orchestrator
shlominoach
190
11k
Site-Speed That Sticks
csswizardry
10
770
Mobile First: as difficult as doing things right
swwweet
223
9.9k
Why You Should Never Use an ORM
jnunemaker
PRO
58
9.5k
Transcript
EXTENDING RUBY with C
Why?
PERFORMANCE
PERFORMANCE
C BINDINGS
C BINDINGS FFI
None
None
array << 1
static VALUE rb_ary_push_1(VALUE ary, VALUE item) {
long idx = RARRAY_LEN(ary); if (idx >= ARY_CAPA(ary)) { ary_double_capa(ary, idx); } RARRAY_PTR(ary)[idx] = item; ARY_SET_LEN(ary, idx + 1); return ary; }
EXT/WORLD/WORLD.C
> World.hello => "Hello, World!"
require "world" describe World do describe "#hello" do
it "greets the world" do World.hello.should == "Hello, World!" end end end
module World module_function def hello
"Hello, World!" end end
None
HELLO
return rb_str_new("Hello, World!", 13);
static VALUE world_hello(VALUE obj) { return rb_str_new("Hello, World!", 13);
}
WORLD
VALUE world_mWorld = rb_define_module("World"); rb_define_module_function(world_mWorld, "hello", world_hello,
0);
#include <ruby.h> static VALUE world_hello(VALUE obj) { return rb_str_new("Hello,
World!", 13); } void Init_world(void) { VALUE world_mWorld = rb_define_module("World"); rb_define_module_function(world_mWorld, "hello", world_hello, 0); }
COMPILATION
require "mkmf"
require "mkmf" $CFLAGS << " -‐Wall -‐Wextra" create_makefile("world")
$ ruby ext/world/extconf.rb creating Makefile
$ make compiling ext/world/world.c linking shared-‐object world.bundle
$ rspec spec/world_spec.rb . Finished in 0.00399 seconds 1
example, 0 failures
None
$ rake compile
require 'rake/extensiontask' require 'rspec/core/rake_task' Rake::ExtensionTask.new('world') RSpec::Core::RakeTask.new('test') task :test
=> :compile task :default => :test
it "greets someone by name, if given" do World.hello("Bob").should
== "Hello, Bob!" end
“If argc is -1, the function will be called as:
VALUE func(int argc, VALUE *argv, VALUE obj) where argc is the actual number of arguments, argv is the C array of the arguments, and obj is the receiver.”
def hello(name = nil) if name
"Hello, #{name}!" else "Hello, World!" end end
rb_define_module_function(world_mWorld, "hello", world_hello, -‐1);
static VALUE world_hello(int argc, VALUE *argv, VALUE obj) {
VALUE name; rb_scan_args(argc, argv, "01", &name); ... }
static VALUE world_hello(int argc, VALUE *argv, VALUE obj) {
VALUE name; rb_scan_args(argc, argv, "01", &name); if (NIL_P(name)) { return rb_str_new("Hello, World!", 13); } else { ... } }
static VALUE world_hello(int argc, VALUE *argv, VALUE obj) {
VALUE name, greeting; rb_scan_args(argc, argv, "01", &name); if (NIL_P(name)) { greeting = rb_str_new("Hello, World!", 13); } else { greeting = rb_str_new("Hello, ", 7); rb_str_cat(greeting, RSTRING_PTR(name), RSTRING_LEN(name)); rb_str_cat(greeting, "!", 1); } return greeting; }
$ rake clean test rm -‐r tmp/x86_64-‐darwin11.3.0/world/1.9.3 mkdir -‐p tmp/x86_64-‐darwin11.3.0/world/1.9.3
cd tmp/x86_64-‐darwin11.3.0/world/1.9.3 /Users/mudge/.rbenv/versions/1.9.3-‐p125/bin/ruby -‐ I. ../../../../ext/world/extconf.rb creating Makefile cd -‐ cd tmp/x86_64-‐darwin11.3.0/world/1.9.3 make compiling ../../../../ext/world/world.c linking shared-‐object world.bundle cd -‐ install -‐c tmp/x86_64-‐darwin11.3.0/world/1.9.3/world.bundle lib/ world.bundle /Users/mudge/.rbenv/versions/1.9.3-‐p125/bin/ruby -‐S rspec ./ spec/world_spec.rb .. Finished in 0.00081 seconds 2 examples, 0 failures
None
QUESTIONS?