SYS_OPEN          = 5   // { int open(char *path, int flags, int mode); }
	SYS_CLOSE         = 6   // { int close(int fd); }
	SYS_WAIT4         = 7   // { int wait4(int pid, int *status, int options, \
	SYS_LINK          = 9   // { int link(char *path, char *link); }
	SYS_UNLINK        = 10  // { int unlink(char *path); }
	SYS_CHDIR         = 12  // { int chdir(char *path); }

### Configuring connection (wait) deadline

This value works in conjunction with max connection setting, setting this value allows for long waiting requests to quickly time out when there is no slot available to perform the request.

// See issue #60276.
func TestCPUMetricsSleep(t *testing.T) {
	if runtime.GOOS == "wasip1" {
		// Since wasip1 busy-waits in the scheduler, there's no meaningful idle
		// time. This is accurately reflected in the metrics, but it means this
		// test is basically meaningless on this platform.
		t.Skip("wasip1 currently busy-waits in idle time; test not applicable")
	}

	names := []string{
		"/cpu/classes/idle:cpu-seconds",

// handler: the sigsend function. The signal handler code does not require
// all the features of notes: it does not need to do a timed wait.
// This is a separate implementation of notes, based on a pipe, that does
// not support timed waits but is async-signal-safe.
func sigNoteSetup(*note) {
	if sigNoteRead != 0 || sigNoteWrite != 0 {

	// iptables-restore version is if it doesn't support --wait, so we
	// can't assume which lock method it'll use.

	// Roughly duplicate iptables 1.6.x xtables_lock() function.
	l.lock16, err = os.OpenFile(lockfilePath16x, os.O_CREATE, 0600)
	if err != nil {
		return nil, fmt.Errorf("failed to open iptables lock %s: %v", lockfilePath16x, err)
	}

	if err := wait.PollImmediate(200*time.Millisecond, 2*time.Second, func() (bool, error) {

		},
		{
			name:               "request is not a WATCH, not added into wait group",
			requestInfo:        &apirequest.RequestInfo{Verb: "get"},
			handlerInvoked:     1,
			statusCodeExpected: http.StatusOK,
		},
		{
			name:                    "request is a WATCH, wait group is in waiting mode",
			requestInfo:             &apirequest.RequestInfo{Verb: "watch"},

				events := b.collectEvents(timer, wait.NeverStop)
				b.processEvents(events)
				return len(events) == 0
			}()
		}
	}()
	return b.delegateBackend.Run(stopCh)
}

// Shutdown blocks until stopCh passed to the Run method is closed and all
// events added prior to that moment are batched and sent to the delegate backend.
func (b *bufferedBackend) Shutdown() {
	// Wait until the routine spawned in Run method exits.

stdout foo

exec echo foo &
exec echo bar &
! exec false &

# Starting a background process should clear previous output.
! stdout foo

# Wait should set the output to the concatenated outputs of the background
# programs, in the order in which they were started.
wait
stdout 'foo\nbar'

# The end of the test should interrupt or kill any remaining background
# programs, but that should not cause the test to fail if it does not

    slowChannel.exitClose.countDown(); // release the interrupter

    // We need to wait for the runner to exit.  To make sure that the interrupting thread wakes it
    // back up.
    runner.join(TimeUnit.SECONDS.toMillis(10));
  }

  // waits for the given thread to be blocked on the given object
  private static void awaitBlockedOnInstanceOf(Thread t, Class<?> blocker)

    slowChannel.exitClose.countDown(); // release the interrupter

    // We need to wait for the runner to exit.  To make sure that the interrupting thread wakes it
    // back up.
    runner.join(TimeUnit.SECONDS.toMillis(10));
  }

  // waits for the given thread to be blocked on the given object
  private static void awaitBlockedOnInstanceOf(Thread t, Class<?> blocker)