信号量Semaphore用来控制同时访问特定资源的线程数量,通过协调各个线程,保证公平合理的使用公共资源。
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;
/**
* @author pengjunzhe
*/
public class SemaphoreTest {
private static final int THREAD_COUNT = 30;
private static ExecutorService threadPool = Executors.newFixedThreadPool(THREAD_COUNT);
private static Semaphore s = new Semaphore(10);
public static void main(String[] args) {
for (int i = 0; i < THREAD_COUNT; i++) {
threadPool.execute(new Runnable() {
@Override
public void run() {
try {
s.acquire();
System.out.println("save data");
s.release();
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
threadPool.shutdown();
}
}