exit(stopProcess())
		case osSignal := <-globalOSSignalCh:
			logger.Info("Exiting on signal: %s", strings.ToUpper(osSignal.String()))
			daemon.SdNotify(false, daemon.SdNotifyStopping)
			exit(stopProcess())
		case signal := <-globalServiceSignalCh:
			switch signal {
			case serviceRestart:
				logger.Info("Restarting on service signal")
				daemon.SdNotify(false, daemon.SdNotifyReloading)
				stop := stopProcess()

asynchronous signal, a Go signal handler will be installed for that
signal. If, later, Reset is called for that signal, the original
handling for that signal will be reinstalled, restoring the non-Go
signal handler if any.

Go code built without -buildmode=c-archive or -buildmode=c-shared will
install a signal handler for the asynchronous signals listed above,
and save any existing signal handler. If a signal is delivered to a

		flags = sigtable[sig].flags
	}

	// If the signal is ignored, raising the signal is no-op.
	if handler == _SIG_IGN || (handler == _SIG_DFL && flags&_SigIgn != 0) {
		return
	}

	// Reset the signal handler and raise the signal.
	// We are currently running inside a signal handler, so the
	// signal is blocked. We need to unblock it before raising the
	// signal, or the signal we raise will be ignored until we return

	// an asynchronous process.
	signals.AfterShutdownDelayDuration = wrapLifecycleSignal(t, signals.AfterShutdownDelayDuration, before, nil)
	signals.PreShutdownHooksStopped = wrapLifecycleSignal(t, signals.PreShutdownHooksStopped, before, nil)
	signals.NotAcceptingNewRequest = wrapLifecycleSignal(t, signals.NotAcceptingNewRequest, before, nil)
	signals.HTTPServerStoppedListening = wrapLifecycleSignal(t, signals.HTTPServerStoppedListening, before, nil)

	}
	printf("}\n\n");

	printf("\n\n// Signal table\n");
	printf("var signalList = [...]struct {\n");
	printf("\tnum  syscall.Signal\n");
	printf("\tname string\n");
	printf("\tdesc string\n");
	printf("} {\n");
	qsort(signals, nelem(signals), sizeof signals[0], tuplecmp);
	for(i=0; i<nelem(signals); i++) {
		e = signals[i].num;
		if(i > 0 && signals[i-1].num == e)
			continue;

	signal.Notify(c, os.Interrupt)
	defer signal.Stop(c)

	p := &os.Process{Pid: os.Getpid()}
	if err := p.Signal(os.Interrupt); err != nil {
		t.Fatalf("Signal got err %v, want nil", err)
	}

	// Verify we actually received the signal.
	select {
	case <-time.After(1 * time.Second):
		t.Error("timeout waiting for signal")
	case <-c:
		// Good
	}
}

func TestProcessReleaseTwice(t *testing.T) {

	// setup
	cfg, assert := setUp(t)

	// scenario 1: single server with some signals
	root, err := cfg.Complete(nil).New("rootServer", NewEmptyDelegate())
	assert.NoError(err)
	if len(root.MuxAndDiscoveryCompleteSignals()) != 0 {
		assert.Error(fmt.Errorf("unexpected signals %v registered in the root server", root.MuxAndDiscoveryCompleteSignals()))
	}

	case "plan9", "windows":
		t.Skipf("no EINTR on %s", runtime.GOOS)
	case "linux":
		if runtime.GOARCH == "386" {
			// On linux-386 the Go signal handler sets
			// a restorer function that is not preserved
			// by the C sigaction call in the test,
			// causing the signal handler to crash when
			// returning the normal code. The test is not
			// architecture-specific, so just skip on 386

	log  *profBuf // profile events written here

	// extra holds extra stacks accumulated in addNonGo
	// corresponding to profiling signals arriving on
	// non-Go-created threads. Those stacks are written
	// to log the next time a normal Go thread gets the
	// signal handler.
	// Assuming the stacks are 2 words each (we don't get
	// a full traceback from those threads), plus one word

 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.api.services;

/**
 * Signals an error when resolving the path to an external model.
 *
 */
public class ModelResolverException extends MavenException {

    /**
     * The group id of the unresolvable model.
     */