if os.Getenv("GO_EXEC_TEST_PID") == "" {
		return
	}

	// Start some threads. 10 is arbitrary but intended to be enough
	// to ensure that the code won't have to create any threads itself.
	// In particular this should be more than the number of threads
	// the garbage collector might create.
	const threads = 10

	var wg sync.WaitGroup
	wg.Add(threads)
	ts := syscall.NsecToTimespec((100 * time.Microsecond).Nanoseconds())

#### Do-stuff-later pool

Sometimes there's an action required like calling the application layer or responding to a ping, and the thread discovering the action is not the thread that should do the work. We enqueue a runnable on this executor and it gets handled by one of the executor's threads.

### Locks

   * running will have the given name.
   *
   * @param callable The callable to wrap
   * @param nameSupplier The supplier of thread names, {@link Supplier#get get} will be called once
   *     for each invocation of the wrapped callable.
   */
  @J2ktIncompatible
  @GwtIncompatible // threads
  static <T extends @Nullable Object> Callable<T> threadRenaming(

   * running will have the given name.
   *
   * @param callable The callable to wrap
   * @param nameSupplier The supplier of thread names, {@link Supplier#get get} will be called once
   *     for each invocation of the wrapped callable.
   */
  @J2ktIncompatible
  @GwtIncompatible // threads
  static <T extends @Nullable Object> Callable<T> threadRenaming(

          public @Nullable Void call() throws Exception {
            assertEquals(Thread.currentThread().getName(), newName.get());
            return null;
          }
        };
    Callables.threadRenaming(callable, newName).call();
    assertEquals(oldName, Thread.currentThread().getName());
  }

  @J2ktIncompatible
  @GwtIncompatible // threads
  public void testRenaming_exceptionalReturn() throws Exception {

          public @Nullable Void call() throws Exception {
            assertEquals(Thread.currentThread().getName(), newName.get());
            return null;
          }
        };
    Callables.threadRenaming(callable, newName).call();
    assertEquals(oldName, Thread.currentThread().getName());
  }

  @J2ktIncompatible
  @GwtIncompatible // threads
  public void testRenaming_exceptionalReturn() throws Exception {

 *
 * <p>Implementations are not guaranteed to be completely thread-safe.
 * However, the implementations:
 * <ul>
 * <li>should allow separate threads for dispatching and receiving, i.e. single thread that dispatches
 * and a different single thread that receives should be perfectly safe</li>
 * <li>should allow stopping or requesting stopping from a different thread than receiving/dispatching</li>

/**
 * A specification that uses multiple test threads. Provides an {@link Executor} and {@link org.gradle.internal.concurrent.ExecutorFactory} implementation.
 *
 * <p>This class maintains a set of instants reached by the test. An instant records the point in time that a test thread reached a certain point of its execution.

import javax.annotation.Nullable

/**
 * Provides support for replacing the interceptors for the current thread.
 * Make sure that the call sites that should be affected by the change are only reached after the interceptors have been substituted.
 *
 * The interceptors are substituted per-thread because other threads may be executing unrelated tests.
 */
abstract class TestInterceptorsSubstitution<T> {
    private final T substitution

     * thread to run as if it were executing an isolated task.
     *
     * Does not release worker lease.
     */
    void runAsIsolatedTask();

    /**
     * Returns {@code true} when this registry grants multiple threads access to projects (but no more than one thread per given project)