Thread safety

package org.example.mianshi.concurrent; SharedState @author lifuchun */ public class ThreadSafeSample {public int sharedState; public void nonSafeAction() { while (sharedState < 100000) { int former = sharedState++; int latter = sharedState; if (former ! = latter - 1) { System.out.printf("Observed data race, former is " + former + ", " + "latter is " + latter); } } } public static void main(String[] args) throws InterruptedException { final ThreadSafeSample sample = new ThreadSafeSample(); Thread threadA = new Thread() { @Override public void run() { sample.nonSafeAction(); }}; Thread threadB = new Thread() { @Override public void run() { sample.nonSafeAction(); }}; threadA.start(); threadB.start(); threadA.join(); threadB.join(); }}Copy the code

summary

This paper compares the difference between sychronized and ReetrantLock; Then we talked about the concept of thread safety and the means to ensure thread safety.

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