}
        """

        when:
        succeeds("run", "--parallel")

        then:
        noExceptionThrown()
    }

    def "re-uses an existing idle worker daemon"() {
        executer.withWorkerDaemonsExpirationDisabled()
        fixture.withWorkActionClassInBuildSrc()

        buildFile << """
            task runInDaemon(type: WorkerTask) {

				return filepath.SkipDir
			}
			return nil
		})
		if err != nil {
			m.AddError(err)
		}
	}

	// Wait for all in-flight operations to complete before returning.
	defer func() {
		<-q.Idle()
		sort.Strings(m.Pkgs) // sort everything we added for determinism
	}()

	if filter == includeStd {
		walkPkgs(cfg.GOROOTsrc, "", pruneGoMod)
		if treeCanMatch("cmd") {

			t.Fatal(err)
		}
		return c
	}

	// Keep one connection in StateNew (connected, but not sending anything)
	cnew := dial()
	defer cnew.Close()

	// Keep one connection in StateIdle (idle after a request)
	cidle := dial()
	defer cidle.Close()
	cidle.Write([]byte("HEAD / HTTP/1.1\r\nHost: foo\r\n\r\n"))
	_, err := http.ReadResponse(bufio.NewReader(cidle), nil)
	if err != nil {
		t.Fatal(err)
	}

        daemons.daemon.assertBusy()
        client.kill()

        then:
        daemons.daemon.becomesCanceled()

        and:
        daemons.daemon.stops()
    }

    def "daemon is idle after the client disconnects and build cancels in a timely manner"() {
        buildFile << """
            task block {
                doLast {
                    ${server.callFromBuild("block")}
                }

		// Incorporate updates from sender into local copy.
		for i := range sig.mask {
			sig.recv[i] = atomic.Xchg(&sig.mask[i], 0)
		}
	}
}

// signalWaitUntilIdle waits until the signal delivery mechanism is idle.
// This is used to ensure that we do not drop a signal notification due
// to a race between disabling a signal and receiving a signal.
// This assumes that signal delivery has already been disabled for

	if err != nil {
		return "", err
	}

	// Limit the number of frames we request.
	pcs = pcs[:min(len(pcs), 16)]

	if len(pcs) == 0 {
		// This can occur if all goroutines are idle, as when
		// caught in a deadlock, or killed by an async signal
		// while blocked.
		//
		// TODO(adonovan): consider how to report such
		// situations. Reporting a goroutine in [sleep] or

Blocking APIs may be inefficient because you hold a thread idle while waiting on the network. Threads are expensive because they have both a memory overhead and a context-switching overhead.

#### Framed protocols

                                  format: int32
                                  type: integer
                                idleTimeout:
                                  description: The idle timeout for upstream connection
                                    pool connections.
                                  type: string
                                maxConcurrentStreams:

====

When a unit of work for a worker daemon is submitted, Gradle will first look to see if a compatible, idle daemon already exists.
If so, it will send the unit of work to the idle daemon, marking it as busy.
If not, it will start a new daemon.

pkg net, type KeepAliveConfig struct #62254
pkg net, type KeepAliveConfig struct, Count int #62254
pkg net, type KeepAliveConfig struct, Enable bool #62254
pkg net, type KeepAliveConfig struct, Idle time.Duration #62254
pkg net, type KeepAliveConfig struct, Interval time.Duration #62254
pkg net, type ListenConfig struct, KeepAliveConfig KeepAliveConfig #62254
pkg net/http, func ParseCookie(string) ([]*Cookie, error) #66008