nim-libp2p/docs/tutorial/start.nim

39 lines
1.1 KiB
Nim

when not(compileOption("threads")):
{.fatal: "Please, compile this program with the --threads:on option!".}
import chronos # an efficient library for async
proc processInput(rfd: AsyncFD) {.async.} =
echo "Type something below to see if the multithread IO works:\nType 'exit' to exit."
let transp = fromPipe(rfd)
while true:
let a = await transp.readLine()
if a == "exit":
quit(0);
echo "You just entered: " & a
proc readInput(wfd: AsyncFD) {.thread.} =
## This procedure performs reading from `stdin` and sends data over
## pipe to main thread.
let transp = fromPipe(wfd)
while true:
let line = stdin.readLine()
discard waitFor transp.write(line & "\r\n")
proc main() {.async.} =
let (rfd, wfd) = createAsyncPipe()
if rfd == asyncInvalidPipe or wfd == asyncInvalidPipe:
raise newException(ValueError, "Could not initialize pipe!")
var thread: Thread[AsyncFD]
thread.createThread(readInput, wfd)
await processInput(rfd)
when isMainModule: # isMainModule = true when the module is compiled as the main file
waitFor(main())