API Reference - uv.parallel

The parallel module contains functions for performing computation in parallel across multiple coroutines. Note that Lua coroutines are not preemptive. Only one coroutine can run at a time, but they yield to each other while waiting for I/O requests from libuv.

parallel.map(inputs, callback)

Map an array of inputs to an array of outputs. Each input is passed to callback in its own coroutine, so that I/O operations are performed in parallel.

local requests = {
  { url = 'http://example.com/page1' },
  { url = 'http://example.com/page2' },
}
local responses = parallel.map(requests, http.request)

parallel.range(n, callback)

Call callback n times, each in its own coroutine. Like a parallel version of the for loop.