main.go

package main

import (
	"fmt"
	"plugin"

	"plugs/shared"
)

func main() {
	p, err := plugin.Open("plug1.so")
	if err != nil {
		panic(err)
	}

	f, err := p.Lookup("Print")
	if err != nil {
		panic(err)
	}

	prnt, ok := f.(func(*shared.Struct))
	if !ok {
		panic("unknown signature")
	}

	s := shared.NewStruct()

	go prnt(s)
	fmt.Println(<-s.Ch1)
}

plug1.go

package main

import (
	"fmt"

	"plugs/shared"
)

func init() {
	fmt.Println("plugin init")
}

func Print(s *shared.Struct) {
	// fmt.Printf("%#v", s)
	s.Ch1 <- 1
}

shared.go

package shared

type Struct struct {
	Name string
	Ch1  chan int
}

func NewStruct() *Struct {
	return &Struct{
		Name: "ololo",
		Ch1:  make(chan int),
	}
}