CGO Memory Map

cgo.go

package main

/*
#include <stdlib.h>

typedef int cgo_ptr;
*/
import "C"

import "sync"

//export cgo_free
func cgo_free(p C.cgo_ptr) {
	cgoFree(ptr(p))
}

type ptr int

var cgoRegs = make(map[ptr]interface{})
var cgoRegMut = sync.RWMutex{}
var cgoNPtrs ptr = 0

func cgoNew(p interface{}) ptr {
	cgoRegMut.Lock()
	defer cgoRegMut.Unlock()

	cgoNPtrs++
	cgoRegs[cgoNPtrs] = p
	return cgoNPtrs
}

func cgoVal(p ptr) interface{} {
	cgoRegMut.RLock()
	defer cgoRegMut.RUnlock()

	return cgoRegs[p]
}

func cgoFree(p ptr) {
	cgoRegMut.Lock()
	defer cgoRegMut.Unlock()

	delete(cgoRegs, p)
}