Safe pointer proxy for lending pointers across runtimes

ptrproxy.go

package main

import "sync"

type ptrId uint

type ptrProxy struct {
	sync.Mutex
	count  uint
	lookup map[ptrId]interface{}
}

func (p *ptrProxy) Acquire(ptr interface{}) ptrId {
	p.Lock()
	id := ptrId(p.count)
	p.count++
	p.lookup[id] = ptr
	p.Unlock()
	return id
}

func (p *ptrProxy) Release(id ptrId) {
	p.Lock()
	delete(p.lookup, id)
	p.Unlock()
}