标签:printBar run int FooBar 几种 printFoo 多线程 方法 public
题目
Java
BLOCKING Queue
BLOCKING QUEUE的性质:
- take()为空时会阻塞
- put()超出size时会阻塞
//17ms 41.4MB
class FooBar {
private int n;
private BlockingQueue<Integer> foo = new LinkedBlockingQueue<>(1);
private BlockingQueue<Integer> bar = new LinkedBlockingQueue<>(1);
public FooBar(int n) {
this.n = n;
}
public void foo(Runnable printFoo) throws InterruptedException {
for (int i = 0; i < n; i++) {
foo.put(1);
printFoo.run();
bar.put(1);
}
}
public void bar(Runnable printBar) throws InterruptedException {
for (int i = 0; i < n; i++) {
bar.take();
printBar.run();
foo.take();
}
}
}
volatile + yield
//18ms 40.9 MB
class FooBar {
private int n;
volatile int cur;
public FooBar(int n) {
this.n = n;
cur = 0;
}
public void foo(Runnable printFoo) throws InterruptedException {
for (int i = 0; i < n; i++) {
while(cur == 1) Thread.yield();
// printFoo.run() outputs "foo". Do not change or remove this line.
printFoo.run();
cur ^= 1;
}
}
public void bar(Runnable printBar) throws InterruptedException {
for (int i = 0; i < n; i++) {
while(cur == 0) Thread.yield();
// printBar.run() outputs "bar". Do not change or remove this line.
printBar.run();
cur ^= 1;
}
}
}
CyclicBarrier阻塞
CyclicBarrier阻塞直到所有线程都到达才运行
效率太低,没咋看
//21ms 41.7MB
class FooBar {
private int n;
public FooBar(int n) {
this.n = n;
}
CyclicBarrier cb = new CyclicBarrier(2);
volatile boolean fin = true;
public void foo(Runnable printFoo) throws InterruptedException {
for (int i = 0; i < n; i++) {
while(!fin);
printFoo.run();
fin = false;
try {
cb.await();
} catch (BrokenBarrierException e) {}
}
}
public void bar(Runnable printBar) throws InterruptedException {
for (int i = 0; i < n; i++) {
try {
cb.await();
} catch (BrokenBarrierException e) {}
printBar.run();
fin = true;
}
}
}
标签:printBar,run,int,FooBar,几种,printFoo,多线程,方法,public 来源: https://www.cnblogs.com/attack204/p/16210432.html
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