adamw

package brc

import monix.eval.Task
import monix.execution
import monix.reactive.Observable

import java.io.{BufferedReader, FileInputStream, InputStreamReader}
import java.text.DecimalFormat

object UsingMonix:

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import java.lang.invoke.MethodHandles;
import java.lang.invoke.VarHandle;
import java.util.concurrent.Exchanger;
import java.util.concurrent.atomic.AtomicReference;
import java.util.concurrent.locks.LockSupport;

// with changes inspired by Exchanger
public class Rendezvous2 {
    private volatile Thread waiting;
    private volatile int data = -1; // together with `consumed`, used to transmit data if t1 wins the race (and waits for t2)

adamw

import cats.effect.{Deferred, IO, Ref}
import cats.effect.std.Queue
import cats.effect.unsafe.implicits.global

import java.util.concurrent.Executors
import scala.concurrent.ExecutionContext

// max times rendezvous using cats-effect's synchronous queue
def rendezvousUsingCatsEffect(): Unit =
  val max = 10_000_000

adamw

import java.util.concurrent.atomic.AtomicReference;
import java.util.concurrent.locks.LockSupport;

public class Rendezvous {
    private final int spinIterations;
    private final int yieldIterations;
    private final AtomicReference<ThreadAndCell> waiting = new AtomicReference<>();

    public Rendezvous(int spinIterations, int yieldIterations) {
        this.spinIterations = spinIterations;

adamw

import java.util.concurrent.Exchanger;
import java.util.concurrent.SynchronousQueue;

public class RendezvousUsingExchanger {
    public static void test() throws Exception {
        long startTime = System.currentTimeMillis();
        final int max = 10_000_000;
        Exchanger<Integer> data = new Exchanger<>();

        Thread t1 = Thread.ofVirtual().start(() -> {

adamw

import java.util.concurrent.atomic.AtomicReference;
import java.util.concurrent.locks.LockSupport;

// -Djdk.virtualThreadScheduler.parallelism=1 -Djdk.virtualThreadScheduler.maxPoolSize=1 -Djdk.virtualThreadScheduler.minRunnable=1
public class Rendezvous {
    private final int spinIterations;
    private final int yieldIterations;
    private final AtomicReference<ThreadAndCell> waiting = new AtomicReference<>();

    public Rendezvous(int spinIterations, int yieldIterations) {

adamw

import java.util.concurrent.atomic.AtomicReference;
import java.util.concurrent.locks.LockSupport;

public class Rendezvous {
    private final boolean yieldOnFirstIteration;
    private final AtomicReference<ThreadAndCell> waiting = new AtomicReference<>();

    public Rendezvous(boolean yieldOnFirstIteration) {
        this.yieldOnFirstIteration = yieldOnFirstIteration;
    }

adamw

// TestMacro.scala

import scala.quoted.*

object TestMacro {
  inline def name[E](e: E): String = ${ nameImpl[E]('e) }

  def nameImpl[E: Type](e: Expr[E])(using Quotes): Expr[String] = {
    import quotes.reflect.*

adamw

//> using dep com.softwaremill.ox::core:0.0.7

import ox.*
import ox.channels.*
import scala.annotation.tailrec

scoped {
  // fast producer
  val c = Channel[Int]()
  fork {

adamw

.libv1> builtins.merge

test1: Nat -> Nat
test1 n = n + n