三段有意思的代码让你思考volatile和cpu缓存
代码一
package main.java.mo.multithread.volatiletest;
public class CacheVolatile {
private int i = 0;
public void write() {
i++;
}
public int read() {
while (i == 0) {
}
return i;
}
public static void main(String[] args) {
CacheVolatile cacheVolatile = new CacheVolatile();
Thread thread = new Thread(() -> {
cacheVolatile.read();
});
thread.start();
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
for (int i = 0; i < 10000; i++)
cacheVolatile.write();
}
}代码二
package main.java.mo.multithread.volatiletest;
public class CacheVolatile {
private int i = 0;
public void write() {
i++;
}
public int read() {
while (i == 0) {
System.out.println(i);
}
return i;
}
public static void main(String[] args) {
CacheVolatile cacheVolatile = new CacheVolatile();
Thread thread = new Thread(() -> {
cacheVolatile.read();
});
thread.start();
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
for (int i = 0; i < 10000; i++)
cacheVolatile.write();
}
}代码三
package main.java.mo.multithread.volatiletest;
public class CacheVolatile {
private volatile int i = 0;
public void write() {
i++;
}
public int read() {
while (i == 0) {
}
return i;
}
public static void main(String[] args) {
CacheVolatile cacheVolatile = new CacheVolatile();
Thread thread = new Thread(() -> {
cacheVolatile.read();
});
thread.start();
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
for (int i = 0; i < 10000; i++)
cacheVolatile.write();
}
}分析
这三段代码执行结果自然各有差异，分析这三段代码可以让你理解volatile和缓存的知识点。
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原始发表：2018-12-24，如有侵权请联系 cloudcommunity@tencent.com 删除
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