gistfile1.txt

local fiber = require('fiber')
  
function another_func()
    fiber.sleep(1)
    fiber.yield()
end

function test()
    local fib = fiber.create(another_func)
    fib:set_joinable(true)
    fib:join()
end

tasks = {}

function start(func, name)

    local worker = fiber.create(function()
        while true do
            local ok, _ = pcall(func)
            fiber.testcancel()
            fiber.sleep(0.1)
        end
    end)

    tasks[name] = worker
end

function stop(name)
    tasks[name]:cancel()
end

start(test, 'test')
stop('test')

while tasks[name] and tasks[name]:status() ~= 'dead' do
  print 'Not ok'
  print(tasks[name]:status())
  fiber.sleep(1)
end

print 'Success!'

This leads to:

tarantool> d:tmp d.sharonov$ tarantool -i test.lua
Success!
Tarantool 1.10.2-66-g2972cfcee
type 'help' for interactive help
tarantool> tasks
---
- test:
    status: suspended
    name: lua
    id: 102
...