Are there some tutorials or practical lessons on how to write an extension for Ruby in Go?
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- dtvp3625 2013-04-22 02:51关注
Go 1.5 added support for building shared libraries that are callable from C (and thus from Ruby via FFI). This makes the process easier than in pre-1.5 releases (when it was necessary to write the C glue layer), and the Go runtime is now usable, making this actually useful in real life (goroutines and memory allocations were not possible before, as they require the Go runtime, which was not useable if Go was not the main entry point).
goFuncs.go:
package main import "C" //export GoAdd func GoAdd(a, b C.int) C.int { return a + b } func main() {} // Required but ignored
Note that the
//export GoAdd
comment is required for each exported function; the symbol afterexport
is how the function will be exported.goFromRuby.rb:
require 'ffi' module GoFuncs extend FFI::Library ffi_lib './goFuncs.so' attach_function :GoAdd, [:int, :int], :int end puts GoFuncs.GoAdd(41, 1)
The library is built with:
go build -buildmode=c-shared -o goFuncs.so goFuncs.go
Running the Ruby script produces:
42
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