double-checked 基本释义：
double-checked 是指一种在编程中用来确保变量在初始化之前没有被其他线程或进程修改的方法。
double-checked 发音：
/?dubo?t?e?kst/
double-checked 英语范文：
I have encountered a situation where I need to ensure that a variable is not already initialized before I initialize it myself. To solve this problem, I have used the double-checked pattern.
double-checked 的英语作文音标和基础释义：
音标：/?dubo?t?e?kst/ /?fa??r?n/ /??n?θr??st/ /??ve?z/ /??v??r?n/ /?t/ /??sa?z?d/ /?n??n?s?t?d /b??lɑ?t?f/ /?pɑ?rt??/
基础释义：一种在编程中用来确保变量在初始化之前没有被其他线程或进程修改的方法。当你在初始化一个变量时，你需要确认它是否已经被初始化过，以避免重复初始化。这种模式通常被称为“双重检查锁定”（double-checked locking）。
Double-checked: A Practical Guide
In programming, double-checked locking is a technique used to avoid the race condition in multi-threaded environments. It involves checking a variable's value twice, once without holding any locks, and again while holding the lock. If the variable is not initialized, it is initialized at this point.
Double-checked pattern can be implemented in different ways, but here's an example in Java:
```java
public class DoubleCheckedLocking {
private volatile Object instance;
public static Object getInstance() {
Object instance = null;
if (instance == null) {
synchronized (DoubleCheckedLocking.class) {
if (instance == null) {
instance = new Object();
}
}
}
return instance;
}
}
```
In this example, we first check if the instance is null without holding any locks. If it is, we enter the synchronized block and check again. If it's still null, we initialize it. This approach ensures that only one thread can initialize the instance at a time, avoiding race conditions.
Now, let's write a short essay on double-checked locking:
"Double-checked locking is a clever technique that helps avoid race conditions in multi-threaded environments. It involves checking a variable's value twice, once without holding any locks, and again while holding the lock. If the variable is not initialized, it is initialized at this point. This pattern ensures that only one thread can initialize the variable at a time, preventing data corruption and ensuring thread safety."
In real-world applications, double-checked locking can be used to initialize objects or variables that need to be accessed by multiple threads. It provides a simple and effective solution to the problem of concurrent access without requiring complex synchronization mechanisms.
double-checked
Double-checked is a programming pattern used to avoid the race condition in multi-threading. It ensures that a variable is only initialized once, even if multiple threads attempt to do so simultaneously. The basic idea behind double-checked is to check if the variable has already been initialized, and only initialize it if it hasn't.
Sample English范文:
Double-checked
In programming, double-checked locking is a pattern that ensures that a variable is only initialized once, even if multiple threads attempt to do so simultaneously. The pattern involves checking if the variable has already been initialized, and only initializing it if it hasn't. This pattern is commonly used in Java and other languages that support threading.
In this scenario, we have a variable named "myVariable" that needs to be initialized. We can use double-checked locking to ensure that only one thread attempts to initialize it at a time, thereby avoiding race conditions and ensuring correctness. Here's how we can implement the pattern in Java:
```java
public class MyClass {
private volatile Boolean hasBeenInitialized;
private int myVariable;
public int getMyVariable() {
if (!hasBeenInitialized) {
synchronized (this) {
if (!hasBeenInitialized) {
initializeMyVariable();
}
}
}
return myVariable;
}
private void initializeMyVariable() {
// Initialize myVariable here
hasBeenInitialized = true;
}
}
```
In this code, we use a volatile Boolean variable named "hasBeenInitialized" to track whether the variable has already been initialized. If it hasn't been initialized, we use a synchronized block to ensure that only one thread attempts to initialize it at a time. Once the variable has been initialized, we can safely return its value to other threads.
