Merge branch '6.0.x'

# Conflicts:
#	spring-core/src/main/java/org/springframework/core/task/SimpleAsyncTaskExecutor.java

spring-context/src/main/java/org/springframework/scheduling/annotation/SchedulingConfigurer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -40,10 +40,10 @@ import org.springframework.scheduling.config.ScheduledTaskRegistrar;
 public interface SchedulingConfigurer {
 
 	/**
-	 * Callback allowing a {@link org.springframework.scheduling.TaskScheduler
+	 * Callback allowing a {@link org.springframework.scheduling.TaskScheduler}
-	 * TaskScheduler} and specific {@link org.springframework.scheduling.config.Task Task}
+	 * and specific {@link org.springframework.scheduling.config.Task} instances
-	 * instances to be registered against the given the {@link ScheduledTaskRegistrar}.
+	 * to be registered against the given the {@link ScheduledTaskRegistrar}.
-	 * @param taskRegistrar the registrar to be configured.
+	 * @param taskRegistrar the registrar to be configured
 	 */
 	void configureTasks(ScheduledTaskRegistrar taskRegistrar);
 

spring-core/src/main/java/org/springframework/util/ConcurrencyThrottleSupport.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -69,7 +69,7 @@ public abstract class ConcurrencyThrottleSupport implements Serializable {
 
 	/**
 	 * Set the maximum number of concurrent access attempts allowed.
-	 * -1 indicates unbounded concurrency.
+	 * The default of -1 indicates no concurrency limit at all.
 	 * <p>In principle, this limit can be changed at runtime,
 	 * although it is generally designed as a config time setting.
 	 * <p>NOTE: Do not switch between -1 and any concrete limit at runtime,
@@ -143,9 +143,10 @@ public abstract class ConcurrencyThrottleSupport implements Serializable {
 	 */
 	protected void afterAccess() {
 		if (this.concurrencyLimit >= 0) {
+			boolean debug = logger.isDebugEnabled();
 			synchronized (this.monitor) {
 				this.concurrencyCount--;
-				if (logger.isDebugEnabled()) {
+				if (debug) {
 					logger.debug("Returning from throttle at concurrency count " + this.concurrencyCount);
 				}
 				this.monitor.notify();