thread.block()
                    instant.thread1
                }
            }
            workerThread {
                thread.blockUntil.start
                state.applyToMutableState {
                    instant.thread2
                }
            }
        }

        then:
        instant.thread2 > instant.thread1
    }

            start {
                workerLeaseService.withLocks([projectLock]) {
                    instant.thread1
                    thread.blockUntil.thread2
                    sleep 100
                }
            }
            start {
                thread.blockUntil.thread1
                instant.thread2
                workerLeaseService.withLocks([projectLock]) {
                    thread2Executed = true

	return 5242;
}

// issue 5337
// Verify that we can withstand SIGPROF received on foreign threads

#ifdef WIN32
void test5337() {}
#else
static void *thread1(void *p) {
	(void)p;
	pthread_kill(pthread_self(), SIGPROF);
	return NULL;
}
void test5337() {
	pthread_t tid;
	pthread_create(&tid, 0, thread1, NULL);
	pthread_join(tid, 0);
}
#endif

// issue 5603

	}
}

// minitSignalMask is called when initializing a new m to set the
// thread's signal mask. When this is called all signals have been
// blocked for the thread.  This starts with m.sigmask, which was set
// either from initSigmask for a newly created thread or by calling
// sigsave if this is a non-Go thread calling a Go function. It
// removes all essential signals from the mask, thus causing those

        try {
            TestThread thread = new TestThread(this, lock, cl)
            thread.start()
            return thread
        } finally {
            lock.unlock()
        }
    }

    /**
     * Starts a thread which executes the given action/closure. Does not wait for the thread to complete.
     *
     * @return A handle to the test thread.
     */
    TestParticipant start(Runnable cl) {

  /**
   * When we need a new thread to run tasks, we call [Backend.execute]. A few microseconds later we
   * expect a newly-started thread to call [Runnable.run]. We shouldn't request new threads until
   * the already-requested ones are in service, otherwise we might create more threads than we need.
   *
   * We use [executeCallCount] and [runCallCount] to defend against starting more threads than we

  }

  /**
   * Add a shutdown hook to wait for thread completion in the given {@link ExecutorService service}.
   * This is useful if the given service uses daemon threads, and we want to keep the JVM from
   * exiting immediately on shutdown, instead giving these daemon threads a chance to terminate
   * normally.
   *
   * @param service ExecutorService which uses daemon threads

	// This function depends on several properties:
	//
	// 1. All OS threads that already exist are associated with an M in
	//    allm. i.e., we won't miss any pre-existing threads.
	// 2. All Ms listed in allm will eventually have an OS thread exist.
	//    i.e., they will set procid and be able to receive signals.
	// 3. OS threads created after we read allm will clone from a thread
	//    that has executed the system call. i.e., they inherit the

  }

  /**
   * Add a shutdown hook to wait for thread completion in the given {@link ExecutorService service}.
   * This is useful if the given service uses daemon threads, and we want to keep the JVM from
   * exiting immediately on shutdown, instead giving these daemon threads a chance to terminate
   * normally.
   *
   * @param service ExecutorService which uses daemon threads

    start();
  }

  // Thread.stop() is okay because all threads started by a test are dying at the end of the test,
  // so there is no object state put at risk by stopping the threads abruptly. In some cases a test
  // may put a thread into an uninterruptible operation intentionally, so there is no other way to
  // clean up these threads.
  @SuppressWarnings("deprecation")
  @Override