Small changes to TimeoutExtension specs

Author: leonard84

spock-specs/src/test/groovy/org/spockframework/docs/timeout/TimeoutConfigurationDoc.groovy

@@ -2,8 +2,10 @@ package org.spockframework.docs.timeout
 
 import org.spockframework.runtime.SpockTimeoutError
 import org.spockframework.runtime.extension.builtin.ThreadDumpUtilityType
+import spock.lang.Isolated
 import spock.timeout.BaseTimeoutExtensionSpecification
 
+@Isolated("The thread dump interferes with the parallel logging")
 class TimeoutConfigurationDoc extends BaseTimeoutExtensionSpecification {
 
   def "thread dump capturing respects provided configuration"() {

spock-specs/src/test/groovy/org/spockframework/smoke/extension/TimeoutExtension.groovy

@@ -31,8 +31,7 @@ import static org.spockframework.runtime.model.parallel.ExecutionMode.SAME_THREA
 /**
  * @author Peter Niederwieser
  */
-@Isolated("The timings are quite tight and it can get flaky on weak machines if run in parallel.")
-@Execution(SAME_THREAD)
+@Isolated("The timings are quite tight and it can get flaky on weak machines if run in parallel, and thread dumps interfere with other test output.")
 @Retry
 class TimeoutExtension extends BaseTimeoutExtensionSpecification {
   @Shared

spock-specs/src/test/groovy/spock/timeout/BaseTimeoutExtensionSpecification.groovy

@@ -4,10 +4,14 @@ import org.spockframework.EmbeddedSpecification
 import org.spockframework.runtime.IStandardStreamsListener
 import org.spockframework.runtime.StandardStreamsCapturer
 import org.spockframework.runtime.extension.builtin.ThreadDumpUtilityType
+import org.spockframework.runtime.model.parallel.Resources
 import spock.lang.AutoCleanup
+import spock.lang.ResourceLock
 
 import java.util.concurrent.TimeUnit
 
+@ResourceLock(Resources.SYSTEM_OUT)
+@ResourceLock(Resources.SYSTEM_ERR)
 abstract class BaseTimeoutExtensionSpecification extends EmbeddedSpecification {
 
   @AutoCleanup("stop")