{"id":1460,"date":"2022-07-01T17:49:03","date_gmt":"2022-07-01T09:49:03","guid":{"rendered":"http:\/\/101.43.188.165\/?p=1460"},"modified":"2022-07-08T19:08:57","modified_gmt":"2022-07-08T11:08:57","slug":"juc-8-%e5%85%b1%e4%ba%ab%e6%a8%a1%e5%9e%8b%e4%b9%8b%e5%b7%a5%e5%85%b7","status":"publish","type":"post","link":"http:\/\/shuaihui.icu\/index.php\/2022\/07\/01\/juc-8-%e5%85%b1%e4%ba%ab%e6%a8%a1%e5%9e%8b%e4%b9%8b%e5%b7%a5%e5%85%b7\/","title":{"rendered":"JUC 8. \u5171\u4eab\u6a21\u578b\u4e4b\u5de5\u5177"},"content":{"rendered":"\n

8.1 <\/strong>\u7ebf\u7a0b\u6c60<\/strong><\/p>\n\n\n\n

1. \u81ea\u5b9a\u4e49\u7ebf\u7a0b\u6c60<\/strong><\/p>\n\n\n\n

\"\"<\/div><\/figure>\n\n\n\n

\u6b65\u9aa41\uff1a\u81ea\u5b9a\u4e49\u62d2\u7edd\u7b56\u7565\u63a5\u53e3<\/p>\n\n\n\n

package com.example.juc;\n\nimport lombok.extern.slf4j.Slf4j;\n\nimport java.sql.Connection;\nimport java.util.ArrayDeque;\nimport java.util.Deque;\nimport java.util.concurrent.locks.Condition;\nimport java.util.concurrent.locks.ReentrantLock;\n\n@Slf4j\npublic class cn8 {\n\n}\n\nclass BlockingQueue<T>{\n    \/\/1.\u4efb\u52a1\u961f\u5217\n    private Deque<T> queue = new ArrayDeque<>();\n    \/\/2\u9501\n    private ReentrantLock lock =new ReentrantLock();\n    \/\/3 . \u751f\u4ea7\u8005\u6761\u4ef6\u53d8\u91cf\n    private Condition fullWaitSet = lock.newCondition();\n    \/\/4.\u6d88\u8d39\u8005\u6761\u4ef6\u53d8\u91cf\n    private Condition emptyWaitSet = lock.newCondition();\n    \/\/5.\u5bb9\u91cf\n    private int capacity;\n\n    public BlockingQueue(int capacity){\n        this.capacity = capacity;\n    }\n\n    \/\/\u963b\u585e\u83b7\u53d6\n    public T take(){\n        lock.lock();\n        try {\n            \/\/\u5982\u679c\u961f\u5217\u662f\u7a7a\u7684\n            while (queue.isEmpty()){\n                try {\n                    \/\/\u90a3\u4e48\u6211\u4eec\u9700\u8981\u8fdb\u5165\u6d88\u8d39\u8005\u6761\u4ef6\u53d8\u91cf\u4e2d\u53bb\u7b49\u5f85\n                    emptyWaitSet.await();\n                } catch (InterruptedException e) {\n                    e.printStackTrace();\n                }\n            }\n            \/\/\u53bb\u9664\u5143\u7d20\n            T t = queue.removeFirst();\n            \/\/\u5524\u9192\u7b49\u5f85\u961f\u5217\u7684\u7ebf\u7a0b\uff0c\u8ba9\u4ed6\u4eecput\u5143\u7d20\n            fullWaitSet.signal();\n            return t;\n        }finally {\n            lock.unlock();\n        }\n    }\n\n    \/\/\u963b\u585e\u6dfb\u52a0\n    public void put(T element){\n        lock.lock();\n        try {\n            \/\/\u8bf4\u660e\u961f\u5217\u5df2\u7ecf\u6ee1\u4e86\n            while (queue.size() == capacity){\n                try {\n                    fullWaitSet.await();\n                } catch (InterruptedException e) {\n                    e.printStackTrace();\n                }\n            }\n            queue.addLast(element);\n            \/\/\u5524\u9192\u6d88\u8d39\u8005\u5bb9\u5668\uff0c\u8ba9\u4ed6\u4eec\u77e5\u9053\u4e0d\u662f\u7a7a\u4e86\uff0c\u53ef\u4ee5\u5f00\u59cb\u83b7\u53d6\n            emptyWaitSet.signal();\n        }finally {\n            lock.unlock();\n        }\n    }\n    \/\/\u83b7\u53d6\u5927\u5c0f\n    public int size(){\n        lock.lock();\n        try {\n            return queue.size();\n        }finally {\n            lock.unlock();\n        }\n    }\n\n}\n<\/code><\/pre>\n\n\n\n
\u624b\u5199\u7ebf\u7a0b\u6c60 <\/p>\n\n\n\n
package com.example.juc;\n\nimport javafx.concurrent.Worker;\nimport lombok.extern.slf4j.Slf4j;\n\nimport java.sql.Connection;\nimport java.util.ArrayDeque;\nimport java.util.Deque;\nimport java.util.HashMap;\nimport java.util.HashSet;\nimport java.util.concurrent.TimeUnit;\nimport java.util.concurrent.locks.Condition;\nimport java.util.concurrent.locks.ReentrantLock;\n\n@Slf4j(topic = \"c.TestPool\")\npublic class TestPool {\n    public static void main(String[] args) {\n        ThreadPool threadPool = new ThreadPool(1,\n                1000, TimeUnit.MILLISECONDS, 1, (queue, task)->{\n            \/\/ 1. \u6b7b\u7b49\n\/\/            queue.put(task);\n            \/\/ 2) \u5e26\u8d85\u65f6\u7b49\u5f85\n            queue.offer(task, 1500, TimeUnit.MILLISECONDS);\n            \/\/ 3) \u8ba9\u8c03\u7528\u8005\u653e\u5f03\u4efb\u52a1\u6267\u884c\n\/\/            log.debug(\"\u653e\u5f03{}\", task);\n            \/\/ 4) \u8ba9\u8c03\u7528\u8005\u629b\u51fa\u5f02\u5e38\n\/\/            throw new RuntimeException(\"\u4efb\u52a1\u6267\u884c\u5931\u8d25 \" + task);\n            \/\/ 5) \u8ba9\u8c03\u7528\u8005\u81ea\u5df1\u6267\u884c\u4efb\u52a1\n            task.run();\n        });\n        for (int i = 0; i < 4; i++) {\n            int j = i;\n            threadPool.execute(() -> {\n                try {\n                    Thread.sleep(1000L);\n                } catch (InterruptedException e) {\n                    e.printStackTrace();\n                }\n                log.debug(\"{}\", j);\n            });\n        }\n    }\n}\n\n@FunctionalInterface \/\/ \u62d2\u7edd\u7b56\u7565\ninterface RejectPolicy<T> {\n    void reject(BlockingQueue<T> queue, T task);\n}\n\n@Slf4j(topic = \"c.ThreadPool\")\nclass ThreadPool {\n    \/\/ \u4efb\u52a1\u961f\u5217\n    private BlockingQueue<Runnable> taskQueue;\n\n    \/\/ \u7ebf\u7a0b\u96c6\u5408\n    private HashSet<Worker> workers = new HashSet<>();\n\n    \/\/ \u6838\u5fc3\u7ebf\u7a0b\u6570\n    private int coreSize;\n\n    \/\/ \u83b7\u53d6\u4efb\u52a1\u65f6\u7684\u8d85\u65f6\u65f6\u95f4\n    private long timeout;\n\n    private TimeUnit timeUnit;\n\n    private RejectPolicy<Runnable> rejectPolicy;\n\n    \/\/ \u6267\u884c\u4efb\u52a1\n    public void execute(Runnable task) {\n        \/\/ \u5f53\u4efb\u52a1\u6570\u6ca1\u6709\u8d85\u8fc7 coreSize \u65f6\uff0c\u76f4\u63a5\u4ea4\u7ed9 worker \u5bf9\u8c61\u6267\u884c\n        \/\/ \u5982\u679c\u4efb\u52a1\u6570\u8d85\u8fc7 coreSize \u65f6\uff0c\u52a0\u5165\u4efb\u52a1\u961f\u5217\u6682\u5b58\n        synchronized (workers) {\n            if(workers.size() < coreSize) {\n                Worker worker = new Worker(task);\n                log.debug(\"\u65b0\u589e worker{}, {}\", worker, task);\n                workers.add(worker);\n                worker.start();\n            } else {\n\/\/                taskQueue.put(task);\n                \/\/ 1) \u6b7b\u7b49\n                \/\/ 2) \u5e26\u8d85\u65f6\u7b49\u5f85\n                \/\/ 3) \u8ba9\u8c03\u7528\u8005\u653e\u5f03\u4efb\u52a1\u6267\u884c\n                \/\/ 4) \u8ba9\u8c03\u7528\u8005\u629b\u51fa\u5f02\u5e38\n                \/\/ 5) \u8ba9\u8c03\u7528\u8005\u81ea\u5df1\u6267\u884c\u4efb\u52a1\n                taskQueue.tryPut(rejectPolicy, task);\n            }\n        }\n    }\n\n    public ThreadPool(int coreSize, long timeout, TimeUnit timeUnit, int queueCapcity, RejectPolicy<Runnable> rejectPolicy) {\n        this.coreSize = coreSize;\n        this.timeout = timeout;\n        this.timeUnit = timeUnit;\n        this.taskQueue = new BlockingQueue<>(queueCapcity);\n        this.rejectPolicy = rejectPolicy;\n    }\n\n    class Worker extends Thread{\n        private Runnable task;\n\n        public Worker(Runnable task) {\n            this.task = task;\n        }\n\n        @Override\n        public void run() {\n            \/\/ \u6267\u884c\u4efb\u52a1\n            \/\/ 1) \u5f53 task \u4e0d\u4e3a\u7a7a\uff0c\u6267\u884c\u4efb\u52a1\n            \/\/ 2) \u5f53 task \u6267\u884c\u5b8c\u6bd5\uff0c\u518d\u63a5\u7740\u4ece\u4efb\u52a1\u961f\u5217\u83b7\u53d6\u4efb\u52a1\u5e76\u6267\u884c\n\/\/            while(task != null || (task = taskQueue.take()) != null) {\n            while(task != null || (task = taskQueue.poll(timeout, timeUnit)) != null) {\n                try {\n                    log.debug(\"\u6b63\u5728\u6267\u884c...{}\", task);\n                    task.run();\n                } catch (Exception e) {\n                    e.printStackTrace();\n                } finally {\n                    task = null;\n                }\n            }\n            synchronized (workers) {\n                log.debug(\"worker \u88ab\u79fb\u9664{}\", this);\n                workers.remove(this);\n            }\n        }\n    }\n}\n@Slf4j(topic = \"c.BlockingQueue\")\nclass BlockingQueue<T> {\n    \/\/ 1. \u4efb\u52a1\u961f\u5217\n    private Deque<T> queue = new ArrayDeque<>();\n\n    \/\/ 2. \u9501\n    private ReentrantLock lock = new ReentrantLock();\n\n    \/\/ 3. \u751f\u4ea7\u8005\u6761\u4ef6\u53d8\u91cf\n    private Condition fullWaitSet = lock.newCondition();\n\n    \/\/ 4. \u6d88\u8d39\u8005\u6761\u4ef6\u53d8\u91cf\n    private Condition emptyWaitSet = lock.newCondition();\n\n    \/\/ 5. \u5bb9\u91cf\n    private int capcity;\n\n    public BlockingQueue(int capcity) {\n        this.capcity = capcity;\n    }\n\n    \/\/ \u5e26\u8d85\u65f6\u963b\u585e\u83b7\u53d6\n    public T poll(long timeout, TimeUnit unit) {\n        lock.lock();\n        try {\n            \/\/ \u5c06 timeout \u7edf\u4e00\u8f6c\u6362\u4e3a \u7eb3\u79d2\n            long nanos = unit.toNanos(timeout);\n            while (queue.isEmpty()) {\n                try {\n                    \/\/ \u8fd4\u56de\u503c\u662f\u5269\u4f59\u65f6\u95f4\n                    if (nanos <= 0) {\n                        return null;\n                    }\n                    nanos = emptyWaitSet.awaitNanos(nanos);\n                } catch (InterruptedException e) {\n                    e.printStackTrace();\n                }\n            }\n            T t = queue.removeFirst();\n            fullWaitSet.signal();\n            return t;\n        } finally {\n            lock.unlock();\n        }\n    }\n\n    \/\/ \u963b\u585e\u83b7\u53d6\n    public T take() {\n        lock.lock();\n        try {\n            while (queue.isEmpty()) {\n                try {\n                    emptyWaitSet.await();\n                } catch (InterruptedException e) {\n                    e.printStackTrace();\n                }\n            }\n            T t = queue.removeFirst();\n            fullWaitSet.signal();\n            return t;\n        } finally {\n            lock.unlock();\n        }\n    }\n\n    \/\/ \u963b\u585e\u6dfb\u52a0\n    public void put(T task) {\n        lock.lock();\n        try {\n            while (queue.size() == capcity) {\n                try {\n                    log.debug(\"\u7b49\u5f85\u52a0\u5165\u4efb\u52a1\u961f\u5217 {} ...\", task);\n                    fullWaitSet.await();\n                } catch (InterruptedException e) {\n                    e.printStackTrace();\n                }\n            }\n            log.debug(\"\u52a0\u5165\u4efb\u52a1\u961f\u5217 {}\", task);\n            queue.addLast(task);\n            emptyWaitSet.signal();\n        } finally {\n            lock.unlock();\n        }\n    }\n\n    \/\/ \u5e26\u8d85\u65f6\u65f6\u95f4\u963b\u585e\u6dfb\u52a0\n    public boolean offer(T task, long timeout, TimeUnit timeUnit) {\n        lock.lock();\n        try {\n            long nanos = timeUnit.toNanos(timeout);\n            while (queue.size() == capcity) {\n                try {\n                    if(nanos <= 0) {\n                        return false;\n                    }\n                    log.debug(\"\u7b49\u5f85\u52a0\u5165\u4efb\u52a1\u961f\u5217 {} ...\", task);\n                    nanos = fullWaitSet.awaitNanos(nanos);\n                } catch (InterruptedException e) {\n                    e.printStackTrace();\n                }\n            }\n            log.debug(\"\u52a0\u5165\u4efb\u52a1\u961f\u5217 {}\", task);\n            queue.addLast(task);\n            emptyWaitSet.signal();\n            return true;\n        } finally {\n            lock.unlock();\n        }\n    }\n\n    public int size() {\n        lock.lock();\n        try {\n            return queue.size();\n        } finally {\n            lock.unlock();\n        }\n    }\n\n    public void tryPut(RejectPolicy<T> rejectPolicy, T task) {\n        lock.lock();\n        try {\n            \/\/ \u5224\u65ad\u961f\u5217\u662f\u5426\u6ee1\n            if(queue.size() == capcity) {\n                rejectPolicy.reject(this, task);\n            } else {  \/\/ \u6709\u7a7a\u95f2\n                log.debug(\"\u52a0\u5165\u4efb\u52a1\u961f\u5217 {}\", task);\n                queue.addLast(task);\n                emptyWaitSet.signal();\n            }\n        } finally {\n            lock.unlock();\n        }\n    }\n}\n<\/code><\/pre>\n\n\n\n
2. ThreadPoolExecutor<\/strong><\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
2) \u6784\u9020\u65b9\u6cd5<\/strong><\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
<\/p>\n\n\n\n
package com.example.juc.cn8;\n\nimport lombok.extern.slf4j.Slf4j;\n\nimport java.util.concurrent.Executor;\nimport java.util.concurrent.ExecutorService;\nimport java.util.concurrent.Executors;\nimport java.util.concurrent.ThreadFactory;\nimport java.util.concurrent.atomic.AtomicInteger;\n\n@Slf4j\npublic class TestThreadExecturos {\n    public static void main(String[] args) {\n        ExecutorService executorService = Executors.newFixedThreadPool(2, new ThreadFactory() {\n            private  AtomicInteger atomicInteger =new AtomicInteger(1);\n            @Override\n            public Thread newThread(Runnable r) {\n                return new Thread(r,\"huihui_pool\"+atomicInteger.getAndIncrement());\n            }\n        });\n        executorService.execute(()->{\n            log.debug(\"{1}\");\n        });\n        executorService.execute(()->{\n            log.debug(\"{2}\");\n        });\n        executorService.execute(()->{\n            log.debug(\"{3}\");\n        });\n    }\n}\n<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
package com.example.juc.cn8;\n\nimport lombok.extern.slf4j.Slf4j;\n\nimport java.util.concurrent.SynchronousQueue;\n\n@Slf4j\npublic class NewCachedThreadPool {\n    public static void main(String[] args) throws InterruptedException {\n        SynchronousQueue<Integer> integers = new SynchronousQueue<>();\n        new Thread(() -> {\n            try {\n                log.debug(\"putting {} \", 1);\n                integers.put(1);\n                log.debug(\"{} putted...\", 1);\n                log.debug(\"putting...{} \", 2);\n                integers.put(2);\n                log.debug(\"{} putted...\", 2);\n            } catch (InterruptedException e) {\n                e.printStackTrace();\n            }\n        },\"t1\").start();\n        Thread.sleep(1000);\n        new Thread(() -> {\n            try {\n                log.debug(\"taking {}\", 1);\n                integers.take();\n            } catch (InterruptedException e) {\n                e.printStackTrace();\n            }\n        },\"t2\").start();\n        Thread.sleep(1000);\n        new Thread(() -> {\n            try {\n                log.debug(\"taking {}\", 2);\n                integers.take();\n            } catch (InterruptedException e) {\n                e.printStackTrace();\n            }\n        },\"t3\").start();\n    }\n}\n<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u8bc4\u4ef7 <\/strong>\u6574\u4e2a\u7ebf\u7a0b\u6c60\u8868\u73b0\u4e3a\u7ebf\u7a0b\u6570\u4f1a\u6839\u636e\u4efb\u52a1\u91cf\u4e0d\u65ad\u589e\u957f\uff0c\u6ca1\u6709\u4e0a\u9650\uff0c\u5f53\u4efb\u52a1\u6267\u884c\u5b8c\u6bd5\uff0c\u7a7a\u95f2 1\u5206\u949f\u540e\u91ca\u653e\u7ebf<\/p>\n\n\n\n
\u7a0b\u3002 \u9002\u5408\u4efb\u52a1\u6570\u6bd4\u8f83\u5bc6\u96c6\uff0c\u4f46\u6bcf\u4e2a\u4efb\u52a1\u6267\u884c\u65f6\u95f4\u8f83\u77ed\u7684\u60c5\u51b5<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u4f7f\u7528\u573a\u666f\uff1a<\/p>\n\n\n\n
\u5e0c\u671b\u591a\u4e2a\u4efb\u52a1\u6392\u961f\u6267\u884c\u3002\u7ebf\u7a0b\u6570\u56fa\u5b9a\u4e3a 1\uff0c\u4efb\u52a1\u6570\u591a\u4e8e 1 \u65f6\uff0c\u4f1a\u653e\u5165\u65e0\u754c\u961f\u5217\u6392\u961f\u3002\u4efb\u52a1\u6267\u884c\u5b8c\u6bd5\uff0c\u8fd9\u552f\u4e00\u7684\u7ebf\u7a0b<\/p>\n\n\n\n
\u4e5f\u4e0d\u4f1a\u88ab\u91ca\u653e\u3002<\/p>\n\n\n\n
\u533a\u522b\uff1a<\/p>\n\n\n\n
\u81ea\u5df1\u521b\u5efa\u4e00\u4e2a\u5355\u7ebf\u7a0b\u4e32\u884c\u6267\u884c\u4efb\u52a1\uff0c\u5982\u679c\u4efb\u52a1\u6267\u884c\u5931\u8d25\u800c\u7ec8\u6b62\u90a3\u4e48\u6ca1\u6709\u4efb\u4f55\u8865\u6551\u63aa\u65bd\uff0c\u800c\u7ebf\u7a0b\u6c60\u8fd8\u4f1a\u65b0\u5efa\u4e00<\/p>\n\n\n\n
\u4e2a\u7ebf\u7a0b\uff0c\u4fdd\u8bc1\u6c60\u7684\u6b63\u5e38\u5de5\u4f5c<\/p>\n\n\n\n
Executors.newSingleThreadExecutor() \u7ebf\u7a0b\u4e2a\u6570\u59cb\u7ec8\u4e3a1\uff0c\u4e0d\u80fd\u4fee\u6539<\/p>\n\n\n\n
FinalizableDelegatedExecutorService \u5e94\u7528\u7684\u662f\u88c5\u9970\u5668\u6a21\u5f0f\uff0c\u53ea\u5bf9\u5916\u66b4\u9732\u4e86 ExecutorService \u63a5\u53e3\uff0c\u56e0<\/p>\n\n\n\n
\u6b64\u4e0d\u80fd\u8c03\u7528 ThreadPoolExecutor \u4e2d\u7279\u6709\u7684\u65b9\u6cd5<\/p>\n\n\n\n
Executors.newFixedThreadPool(1) \u521d\u59cb\u65f6\u4e3a1\uff0c\u4ee5\u540e\u8fd8\u53ef\u4ee5\u4fee\u6539<\/p>\n\n\n\n
\u5bf9\u5916\u66b4\u9732\u7684\u662f ThreadPoolExecutor \u5bf9\u8c61\uff0c\u53ef\u4ee5\u5f3a\u8f6c\u540e\u8c03\u7528 setCorePoolSize \u7b49\u65b9\u6cd5\u8fdb\u884c\u4fee\u6539<\/p>\n\n\n\n
6) \u63d0\u4ea4\u4efb\u52a1<\/strong><\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
8) <\/strong>\u4efb\u52a1\u8c03\u5ea6\u7ebf\u7a0b\u6c60<\/strong><\/p>\n\n\n\n
\u5728\u300e\u4efb\u52a1\u8c03\u5ea6\u7ebf\u7a0b\u6c60\u300f\u529f\u80fd\u52a0\u5165\u4e4b\u524d\uff0c\u53ef\u4ee5\u4f7f\u7528 java.util.Timer \u6765\u5b9e\u73b0\u5b9a\u65f6\u529f\u80fd\uff0cTimer \u7684\u4f18\u70b9\u5728\u4e8e\u7b80\u5355\u6613\u7528\uff0c\u4f46<\/p>\n\n\n\n
\u7531\u4e8e\u6240\u6709\u4efb\u52a1\u90fd\u662f\u7531\u540c\u4e00\u4e2a\u7ebf\u7a0b\u6765\u8c03\u5ea6\uff0c\u56e0\u6b64\u6240\u6709\u4efb\u52a1\u90fd\u662f\u4e32\u884c\u6267\u884c\u7684\uff0c\u540c\u4e00\u65f6\u95f4\u53ea\u80fd\u6709\u4e00\u4e2a\u4efb\u52a1\u5728\u6267\u884c\uff0c\u524d\u4e00\u4e2a<\/p>\n\n\n\n
\u4efb\u52a1\u7684\u5ef6\u8fdf\u6216\u5f02\u5e38\u90fd\u5c06\u4f1a\u5f71\u54cd\u5230\u4e4b\u540e\u7684\u4efb\u52a1<\/p>\n\n\n\n
public static void main(String[] args) {\n Timer timer = new Timer();\n TimerTask task1 = new TimerTask() {\n @Override\n public void run() {\n log.debug(\"task 1\");\n sleep(2);\n}\n };\n TimerTask task2 = new TimerTask() {\n @Override\n public void run() {\n log.debug(\"task 2\");\n }\n };\n \/\/ \u4f7f\u7528 timer \u6dfb\u52a0\u4e24\u4e2a\u4efb\u52a1\uff0c\u5e0c\u671b\u5b83\u4eec\u90fd\u5728 1s \u540e\u6267\u884c\n \/\/ \u4f46\u7531\u4e8e timer \u5185\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u6765\u987a\u5e8f\u6267\u884c\u961f\u5217\u4e2d\u7684\u4efb\u52a1\uff0c\u56e0\u6b64\u300e\u4efb\u52a11\u300f\u7684\u5ef6\u65f6\uff0c\u5f71\u54cd\u4e86\u300e\u4efb\u52a12\u300f\u7684\u6267\u884c\n timer.schedule(task1, 1000);\n timer.schedule(task2, 1000);\n}<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u4f7f\u7528 ScheduledExecutorService \u6539\u5199\uff1a<\/p>\n\n\n\n
ScheduledExecutorService executor = Executors.newScheduledThreadPool(2);\n\/\/ \u6dfb\u52a0\u4e24\u4e2a\u4efb\u52a1\uff0c\u5e0c\u671b\u5b83\u4eec\u90fd\u5728 1s \u540e\u6267\u884c\nexecutor.schedule(() -> {\n System.out.println(\"\u4efb\u52a11\uff0c\u6267\u884c\u65f6\u95f4\uff1a\" + new Date());\n try { Thread.sleep(2000); } catch (InterruptedException e) { }\n}, 1000, TimeUnit.MILLISECONDS);\nexecutor.schedule(() -> {\n System.out.println(\"\u4efb\u52a12\uff0c\u6267\u884c\u65f6\u95f4\uff1a\" + new Date());\n}, 1000, TimeUnit.MILLISECONDS);<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
scheduleAtFixedRate \u4f8b\u5b50\uff1a<\/p>\n\n\n\n
ScheduledExecutorService pool = Executors.newScheduledThreadPool(1);\nlog.debug(\"start...\");\npool.scheduleAtFixedRate(() -> {\n log.debug(\"running...\");\n}, 1, 1, TimeUnit.SECONDS);<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
scheduleAtFixedRate \u4f8b\u5b50\uff08\u4efb\u52a1\u6267\u884c\u65f6\u95f4\u8d85\u8fc7\u4e86\u95f4\u9694\u65f6\u95f4\uff09\uff1a<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
scheduleWithFixedDelay \u4f8b\u5b50\uff1a<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u8f93\u51fa\u5206\u6790\uff1a\u4e00\u5f00\u59cb\uff0c\u5ef6\u65f6 1s\uff0cscheduleWithFixedDelay \u7684\u95f4\u9694\u662f \u4e0a\u4e00\u4e2a\u4efb\u52a1\u7ed3\u675f <-> \u5ef6\u65f6 <-> \u4e0b\u4e00\u4e2a\u4efb\u52a1\u5f00\u59cb \u6240<\/p>\n\n\n\n
\u4ee5\u95f4\u9694\u90fd\u662f 3s<\/p>\n\n\n\n
\"\"<\/div>
\u8bc4\u4ef7 <\/strong>\u6574\u4e2a\u7ebf\u7a0b\u6c60\u8868\u73b0\u4e3a\uff1a\u7ebf\u7a0b\u6570\u56fa\u5b9a\uff0c\u4efb\u52a1\u6570\u591a\u4e8e\u7ebf\u7a0b\u6570\u65f6\uff0c\u4f1a\u653e\u5165\u65e0\u754c\u961f\u5217\u6392\u961f\u3002\u4efb\u52a1\u6267\u884c\u5b8c\u6bd5\uff0c\u8fd9\u4e9b\u7ebf
\u7a0b\u4e5f\u4e0d\u4f1a\u88ab\u91ca\u653e\u3002\u7528\u6765\u6267\u884c\u5ef6\u8fdf\u6216\u53cd\u590d\u6267\u884c\u7684\u4efb\u52a1<\/figcaption><\/figure>\n\n\n\n
9) <\/strong>\u6b63\u786e\u5904\u7406\u6267\u884c\u4efb\u52a1\u5f02\u5e38<\/strong><\/p>\n\n\n\n
\u65b9\u6cd51\uff1a\u4e3b\u52a8\u6349\u5f02\u5e38<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u65b9\u6cd52\uff1a\u4f7f\u7528 Future<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u5b9a\u65f6<\/strong><\/p>\n\n\n\n
1. \u5b9a\u671f\u6267\u884c<\/strong><\/p>\n\n\n\n
\u5982\u4f55\u8ba9\u6bcf\u5468\u56db 18:00:00 \u5b9a\u65f6\u6267\u884c\u4efb\u52a1\uff1f<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
<\/p>\n\n\n\n
10) Tomcat <\/strong>\u7ebf\u7a0b\u6c60<\/strong><\/p>\n\n\n\n
Tomcat \u5728\u54ea\u91cc\u7528\u5230\u4e86\u7ebf\u7a0b\u6c60\u5462<\/p>\n\n\n\n
LimitLatch \u7528\u6765\u9650\u6d41\uff0c\u53ef\u4ee5\u63a7\u5236\u6700\u5927\u8fde\u63a5\u4e2a\u6570\uff0c\u7c7b\u4f3c J.U.C \u4e2d\u7684 Semaphore \u540e\u9762\u518d\u8bb2<\/p>\n\n\n\n
Acceptor \u53ea\u8d1f\u8d23\u3010\u63a5\u6536\u65b0\u7684 socket \u8fde\u63a5\u3011<\/p>\n\n\n\n
Poller \u53ea\u8d1f\u8d23\u76d1\u542c socket channel \u662f\u5426\u6709\u3010\u53ef\u8bfb\u7684 I\/O \u4e8b\u4ef6\u3011<\/p>\n\n\n\n
\u4e00\u65e6\u53ef\u8bfb\uff0c\u5c01\u88c5\u4e00\u4e2a\u4efb\u52a1\u5bf9\u8c61\uff08socketProcessor\uff09\uff0c\u63d0\u4ea4\u7ed9 Executor \u7ebf\u7a0b\u6c60\u5904\u7406<\/p>\n\n\n\n
Executor \u7ebf\u7a0b\u6c60\u4e2d\u7684\u5de5\u4f5c\u7ebf\u7a0b\u6700\u7ec8\u8d1f\u8d23\u3010\u5904\u7406\u8bf7\u6c42\u3011<\/p>\n\n\n\n
Tomcat \u7ebf\u7a0b\u6c60\u6269\u5c55\u4e86 ThreadPoolExecutor\uff0c\u884c\u4e3a\u7a0d\u6709\u4e0d\u540c<\/p>\n\n\n\n
\u5982\u679c\u603b\u7ebf\u7a0b\u6570\u8fbe\u5230 maximumPoolSize<\/p>\n\n\n\n
\u8fd9\u65f6\u4e0d\u4f1a\u7acb\u523b\u629b RejectedExecutionException \u5f02\u5e38<\/p>\n\n\n\n
\u800c\u662f\u518d\u6b21\u5c1d\u8bd5\u5c06\u4efb\u52a1\u653e\u5165\u961f\u5217\uff0c\u5982\u679c\u8fd8\u5931\u8d25\uff0c\u624d\u629b\u51fa RejectedExecutionException \u5f02\u5e38<\/p>\n\n\n\n
\u6e90\u7801 tomcat-7.0.42<\/p>\n\n\n\n
public void execute(Runnable command, long timeout, TimeUnit unit) {\n submittedCount.incrementAndGet();\n try {\n super.execute(command);\n } catch (RejectedExecutionException rx) {\n if (super.getQueue() instanceof TaskQueue) {\n final TaskQueue queue = (TaskQueue)super.getQueue();\n try {\n if (!queue.force(command, timeout, unit)) {\n submittedCount.decrementAndGet();\n throw new RejectedExecutionException(\"Queue capacity is full.\");\n }\n } catch (InterruptedException x) {\n submittedCount.decrementAndGet();\n Thread.interrupted();\n throw new RejectedExecutionException(x);\n }\n} else {\n submittedCount.decrementAndGet();\n throw rx;\n }\n }\n}<\/code><\/pre>\n\n\n\n
TaskQueue.java<\/p>\n\n\n\n
public boolean force(Runnable o, long timeout, TimeUnit unit) throws InterruptedException {\n if ( parent.isShutdown() ) \n throw new RejectedExecutionException(\n \"Executor not running, can't force a command into the queue\"\n );\n return super.offer(o,timeout,unit); \/\/forces the item onto the queue, to be used if the task \nis rejected\n}<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
Executor \u7ebf\u7a0b\u914d\u7f6e<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
3. Fork\/Join<\/strong><\/p>\n\n\n\n
1) <\/strong>\u6982\u5ff5<\/strong><\/p>\n\n\n\n
Fork\/Join \u662f JDK 1.7 \u52a0\u5165\u7684\u65b0\u7684\u7ebf\u7a0b\u6c60\u5b9e\u73b0\uff0c\u5b83\u4f53\u73b0\u7684\u662f\u4e00\u79cd\u5206\u6cbb\u601d\u60f3\uff0c\u9002\u7528\u4e8e\u80fd\u591f\u8fdb\u884c\u4efb\u52a1\u62c6\u5206\u7684 cpu \u5bc6\u96c6\u578b<\/p>\n\n\n\n
\u8fd0\u7b97<\/p>\n\n\n\n
\u6240\u8c13\u7684\u4efb\u52a1\u62c6\u5206\uff0c\u662f\u5c06\u4e00\u4e2a\u5927\u4efb\u52a1\u62c6\u5206\u4e3a\u7b97\u6cd5\u4e0a\u76f8\u540c\u7684\u5c0f\u4efb\u52a1\uff0c\u76f4\u81f3\u4e0d\u80fd\u62c6\u5206\u53ef\u4ee5\u76f4\u63a5\u6c42\u89e3\u3002\u8ddf\u9012\u5f52\u76f8\u5173\u7684\u4e00\u4e9b\u8ba1<\/p>\n\n\n\n
\u7b97\uff0c\u5982\u5f52\u5e76\u6392\u5e8f\u3001\u6590\u6ce2\u90a3\u5951\u6570\u5217\u3001\u90fd\u53ef\u4ee5\u7528\u5206\u6cbb\u601d\u60f3\u8fdb\u884c\u6c42\u89e3<\/p>\n\n\n\n
Fork\/Join \u5728\u5206\u6cbb\u7684\u57fa\u7840\u4e0a\u52a0\u5165\u4e86\u591a\u7ebf\u7a0b\uff0c\u53ef\u4ee5\u628a\u6bcf\u4e2a\u4efb\u52a1\u7684\u5206\u89e3\u548c\u5408\u5e76\u4ea4\u7ed9\u4e0d\u540c\u7684\u7ebf\u7a0b\u6765\u5b8c\u6210\uff0c\u8fdb\u4e00\u6b65\u63d0\u5347\u4e86\u8fd0<\/p>\n\n\n\n
\u7b97\u6548\u7387<\/p>\n\n\n\n
Fork\/Join \u9ed8\u8ba4\u4f1a\u521b\u5efa\u4e0e cpu \u6838\u5fc3\u6570\u5927\u5c0f\u76f8\u540c\u7684\u7ebf\u7a0b\u6c60<\/p>\n\n\n\n
2) <\/strong>\u4f7f\u7528<\/strong><\/p>\n\n\n\n
\u63d0\u4ea4\u7ed9 Fork\/Join \u7ebf\u7a0b\u6c60\u7684\u4efb\u52a1\u9700\u8981\u7ee7\u627f RecursiveTask\uff08\u6709\u8fd4\u56de\u503c\uff09\u6216 RecursiveAction\uff08\u6ca1\u6709\u8fd4\u56de\u503c\uff09\uff0c\u4f8b\u5982\u4e0b<\/p>\n\n\n\n
\u9762\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5bf9 1~n \u4e4b\u95f4\u7684\u6574\u6570\u6c42\u548c\u7684\u4efb\u52a1<\/p>\n\n\n\n
package com.example.juc.cn8;\n\nimport lombok.extern.slf4j.Slf4j;\n\nimport java.util.concurrent.ForkJoinPool;\nimport java.util.concurrent.RecursiveTask;\n\n@Slf4j\npublic class TestForkJoin {\n    public static void main(String[] args) {\n        ForkJoinPool forkJoinPool = new ForkJoinPool(4); \/\/\u5982\u679c\u4e0d\u6307\u5b9a\u53c2\u6570\uff0c\u90a3\u4e48\u9ed8\u8ba4\u662f\u6211\u4eec\u7684cpu\u7ebf\u7a0b\u6570\n        System.out.println(forkJoinPool.invoke(new MyTask(5)));\n    }\n}\n\/\/1~n\u4e4b\u95f4\u6570\u5b57\u7684\u548c\n@Slf4j\nclass MyTask extends RecursiveTask<Integer>{\n\n    private int  n;\n\n    public MyTask(int n) {\n        this.n = n;\n    }\n\n    @Override\n    public String toString() {\n        return \"MyTask{\" +\n                \"n=\" + n +\n                '}';\n    }\n\n    @Override\n    protected Integer compute() {\n        \/\/\u7ec8\u6b62\u6761\u4ef6\uff0c\u5206\u6cbb\n        if (n == 1) {\n            log.debug(\"join(){}\",n);\n            return 1;\n        }\n        MyTask myTask = new MyTask(n - 1);\n\n        myTask.fork();\/\/\u8ba9\u4e00\u4e2a\u7ebf\u7a0b\u53bb\u6267\u884c\u6b64\u4efb\u52a1\n\n        log.debug(\"fork(){} + {}\",n,myTask);\n        \/\/\u5408\u5e76\u7ed3\u679c\n        int result = n + myTask.join();\n        log.debug(\"join(){} + {} = {}\",n,myTask,result);\n        return result;\n    }\n}\n<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u6539\u8fdb<\/p>\n\n\n\n
class AddTask3 extends RecursiveTask<Integer> {\n \n int begin;\n int end;\n public AddTask3(int begin, int end) {\n this.begin = begin;\n this.end = end;\n }\n @Override\n public String toString() {\n return \"{\" + begin + \",\" + end + '}';\n }\n @Override\n protected Integer compute() {\n \/\/ 5, 5\n if (begin == end) {\n log.debug(\"join() {}\", begin);\n return begin;\n }\n \/\/ 4, 5\nif (end - begin == 1) {\n log.debug(\"join() {} + {} = {}\", begin, end, end + begin);\n return end + begin;\n }\n \n \/\/ 1 5\n int mid = (end + begin) \/ 2; \/\/ 3\n AddTask3 t1 = new AddTask3(begin, mid); \/\/ 1,3\n t1.fork();\n AddTask3 t2 = new AddTask3(mid + 1, end); \/\/ 4,5\n t2.fork();\n log.debug(\"fork() {} + {} = ?\", t1, t2);\n int result = t1.join() + t2.join();\n log.debug(\"join() {} + {} = {}\", t1, t2, result);\n return result;\n }\n}<\/code><\/pre>\n\n\n\n
\u7136\u540e\u63d0\u4ea4\u7ed9 ForkJoinPool \u6765\u6267\u884c<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
AQS <\/strong>\u539f\u7406<\/strong><\/p>\n\n\n\n
1. <\/strong>\u6982\u8ff0<\/strong><\/p>\n\n\n\n
\u5168\u79f0\u662f AbstractQueuedSynchronizer\uff0c\u662f\u963b\u585e\u5f0f\u9501\u548c\u76f8\u5173\u7684\u540c\u6b65\u5668\u5de5\u5177\u7684\u6846\u67b6<\/p>\n\n\n\n
\u7279\u70b9\uff1a<\/p>\n\n\n\n
\u7528 state \u5c5e\u6027\u6765\u8868\u793a\u8d44\u6e90\u7684\u72b6\u6001\uff08\u5206\u72ec\u5360\u6a21\u5f0f\u548c\u5171\u4eab\u6a21\u5f0f\uff09\uff0c\u5b50\u7c7b\u9700\u8981\u5b9a\u4e49\u5982\u4f55\u7ef4\u62a4\u8fd9\u4e2a\u72b6\u6001\uff0c\u63a7\u5236\u5982\u4f55\u83b7\u53d6<\/p>\n\n\n\n
\u9501\u548c\u91ca\u653e\u9501<\/p>\n\n\n\n
getState – \u83b7\u53d6 state \u72b6\u6001<\/p>\n\n\n\n
setState – \u8bbe\u7f6e state \u72b6\u6001<\/p>\n\n\n\n
compareAndSetState – cas \u673a\u5236\u8bbe\u7f6e state \u72b6\u6001<\/p>\n\n\n\n
\u72ec\u5360\u6a21\u5f0f\u662f\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u80fd\u591f\u8bbf\u95ee\u8d44\u6e90\uff0c\u800c\u5171\u4eab\u6a21\u5f0f\u53ef\u4ee5\u5141\u8bb8\u591a\u4e2a\u7ebf\u7a0b\u8bbf\u95ee\u8d44\u6e90<\/p>\n\n\n\n
\u63d0\u4f9b\u4e86\u57fa\u4e8e FIFO \u7684\u7b49\u5f85\u961f\u5217\uff0c\u7c7b\u4f3c\u4e8e Monitor \u7684 EntryList<\/p>\n\n\n\n
\u6761\u4ef6\u53d8\u91cf\u6765\u5b9e\u73b0\u7b49\u5f85\u3001\u5524\u9192\u673a\u5236\uff0c\u652f\u6301\u591a\u4e2a\u6761\u4ef6\u53d8\u91cf\uff0c\u7c7b\u4f3c\u4e8e Monitor \u7684 WaitSet<\/p>\n\n\n\n
\u5b50\u7c7b\u4e3b\u8981\u5b9e\u73b0\u8fd9\u6837\u4e00\u4e9b\u65b9\u6cd5\uff08\u9ed8\u8ba4\u629b\u51fa UnsupportedOperationException\uff09<\/p>\n\n\n\n
tryAcquire<\/p>\n\n\n\n
tryRelease<\/p>\n\n\n\n
tryAcquireShared<\/p>\n\n\n\n
tryReleaseShared<\/p>\n\n\n\n
isHeldExclusively<\/p>\n\n\n\n
2. <\/strong>\u5b9e\u73b0\u4e0d\u53ef\u91cd\u5165\u9501<\/strong><\/p>\n\n\n\n
\u81ea\u5b9a\u4e49\u540c\u6b65\u5668<\/strong><\/p>\n\n\n\n
package com.example.juc.cn8;\n\nimport lombok.extern.slf4j.Slf4j;\n\nimport java.util.concurrent.TimeUnit;\nimport java.util.concurrent.locks.AbstractQueuedSynchronizer;\nimport java.util.concurrent.locks.Condition;\nimport java.util.concurrent.locks.Lock;\n\n@Slf4j\npublic class TestAqs {\n    public static void main(String[] args) {\n        MyLock myLock = new MyLock();\n        new Thread(()->{\n\/\/            myLock.lock();\n\/\/            log.debug(\"locking....\");\n            myLock.lock();\n            log.debug(\"locking....\");\n            try {\n            log.debug(\"locking....\");\n                try {\n                    Thread.sleep(1000);\n                } catch (InterruptedException e) {\n                    e.printStackTrace();\n                }\n            }finally {\n                log.debug(\"unlocking...\");\n                myLock.unlock();\n            }\n        },\"t1\").start();\n        new Thread(()->{\n            myLock.lock();\n            try {\n                log.debug(\"locking....\");\n                try {\n                    Thread.sleep(1000);\n                } catch (InterruptedException e) {\n                    e.printStackTrace();\n                }\n            }finally {\n                log.debug(\"unlocking...\");\n                myLock.unlock();\n            }\n        },\"t2\").start();\n    }\n}\n\n\/\/\u81ea\u5b9a\u4e49\u9501\uff08\u4e0d\u53ef\u51b2\u5165\u9501\uff09\n\/\/ \u81ea\u5b9a\u4e49\u9501\uff08\u4e0d\u53ef\u91cd\u5165\u9501\uff09\nclass MyLock implements Lock {\n\n    \/\/ \u72ec\u5360\u9501  \u540c\u6b65\u5668\u7c7b\n    class MySync extends AbstractQueuedSynchronizer {\n        @Override\n        protected boolean tryAcquire(int arg) {\n            if(compareAndSetState(0, 1)) {\n                \/\/ \u52a0\u4e0a\u4e86\u9501\uff0c\u5e76\u8bbe\u7f6e owner \u4e3a\u5f53\u524d\u7ebf\u7a0b\n                setExclusiveOwnerThread(Thread.currentThread());\n                return true;\n            }\n            return false;\n        }\n\n        @Override\n        protected boolean tryRelease(int arg) {\n            setExclusiveOwnerThread(null);\n            setState(0);\n            return true;\n        }\n\n        @Override \/\/ \u662f\u5426\u6301\u6709\u72ec\u5360\u9501\n        protected boolean isHeldExclusively() {\n            return getState() == 1;\n        }\n\n        public Condition newCondition() {\n            return new ConditionObject();\n        }\n    }\n\n    private MySync sync = new MySync();\n\n    @Override \/\/ \u52a0\u9501\uff08\u4e0d\u6210\u529f\u4f1a\u8fdb\u5165\u7b49\u5f85\u961f\u5217\uff09\n    public void lock() {\n        sync.acquire(1);\n    }\n\n    @Override \/\/ \u52a0\u9501\uff0c\u53ef\u6253\u65ad\n    public void lockInterruptibly() throws InterruptedException {\n        sync.acquireInterruptibly(1);\n    }\n\n    @Override \/\/ \u5c1d\u8bd5\u52a0\u9501\uff08\u4e00\u6b21\uff09\n    public boolean tryLock() {\n        return sync.tryAcquire(1);\n    }\n\n    @Override \/\/ \u5c1d\u8bd5\u52a0\u9501\uff0c\u5e26\u8d85\u65f6\n    public boolean tryLock(long time, TimeUnit unit) throws InterruptedException {\n        return sync.tryAcquireNanos(1, unit.toNanos(time));\n    }\n\n    @Override \/\/ \u89e3\u9501\n    public void unlock() {\n        sync.release(1);\n    }\n\n    @Override \/\/ \u521b\u5efa\u6761\u4ef6\u53d8\u91cf\n    public Condition newCondition() {\n        return sync.newCondition();\n    }\n}\n<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
ReentrantLock \u539f\u7406<\/strong><\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
1. <\/strong>\u975e\u516c\u5e73\u9501\u5b9e\u73b0\u539f\u7406<\/strong><\/p>\n\n\n\n
\u52a0\u9501\u89e3\u9501\u6d41\u7a0b<\/strong><\/p>\n\n\n\n
\u5148\u4ece\u6784\u9020\u5668\u5f00\u59cb\u770b\uff0c\u9ed8\u8ba4\u4e3a\u975e\u516c\u5e73\u9501\u5b9e\u73b0<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u7b2c\u4e00\u4e2a\u7ade\u4e89\u51fa\u73b0\u65f6<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
Thread-1 \u6267\u884c\u4e86<\/p>\n\n\n\n
1. CAS \u5c1d\u8bd5\u5c06 state \u7531 0 \u6539\u4e3a 1\uff0c\u7ed3\u679c\u5931\u8d25<\/p>\n\n\n\n
2. \u8fdb\u5165 tryAcquire \u903b\u8f91\uff0c\u8fd9\u65f6 state \u5df2\u7ecf\u662f1\uff0c\u7ed3\u679c\u4ecd\u7136\u5931\u8d25<\/p>\n\n\n\n
3. \u63a5\u4e0b\u6765\u8fdb\u5165 addWaiter \u903b\u8f91\uff0c\u6784\u9020 Node \u961f\u5217<\/p>\n\n\n\n
\u56fe\u4e2d\u9ec4\u8272\u4e09\u89d2\u8868\u793a\u8be5 Node \u7684 waitStatus \u72b6\u6001\uff0c\u5176\u4e2d 0 \u4e3a\u9ed8\u8ba4\u6b63\u5e38\u72b6\u6001<\/p>\n\n\n\n
Node \u7684\u521b\u5efa\u662f\u61d2\u60f0\u7684<\/p>\n\n\n\n
\u5176\u4e2d\u7b2c\u4e00\u4e2a Node \u79f0\u4e3a Dummy\uff08\u54d1\u5143\uff09\u6216\u54e8\u5175\uff0c\u7528\u6765\u5360\u4f4d\uff0c\u5e76\u4e0d\u5173\u8054\u7ebf\u7a0b<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u5f53\u524d\u7ebf\u7a0b\u8fdb\u5165 acquireQueued \u903b\u8f91<\/p>\n\n\n\n
1. acquireQueued \u4f1a\u5728\u4e00\u4e2a\u6b7b\u5faa\u73af\u4e2d\u4e0d\u65ad\u5c1d\u8bd5\u83b7\u5f97\u9501\uff0c\u5931\u8d25\u540e\u8fdb\u5165 park \u963b\u585e<\/p>\n\n\n\n
2. \u5982\u679c\u81ea\u5df1\u662f\u7d27\u90bb\u7740 head\uff08\u6392\u7b2c\u4e8c\u4f4d\uff09\uff0c\u90a3\u4e48\u518d\u6b21 tryAcquire \u5c1d\u8bd5\u83b7\u53d6\u9501\uff0c\u5f53\u7136\u8fd9\u65f6 state \u4ecd\u4e3a 1\uff0c\u5931\u8d25<\/p>\n\n\n\n
3. \u8fdb\u5165 shouldParkAfterFailedAcquire \u903b\u8f91\uff0c\u5c06\u524d\u9a71 node\uff0c\u5373 head \u7684 waitStatus \u6539\u4e3a -1\uff0c\u8fd9\u6b21\u8fd4\u56de false<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
4. shouldParkAfterFailedAcquire \u6267\u884c\u5b8c\u6bd5\u56de\u5230 acquireQueued \uff0c\u518d\u6b21 tryAcquire \u5c1d\u8bd5\u83b7\u53d6\u9501\uff0c\u5f53\u7136\u8fd9\u65f6<\/p>\n\n\n\n
state \u4ecd\u4e3a 1\uff0c\u5931\u8d25<\/p>\n\n\n\n
5. \u5f53\u518d\u6b21\u8fdb\u5165 shouldParkAfterFailedAcquire \u65f6\uff0c\u8fd9\u65f6\u56e0\u4e3a\u5176\u524d\u9a71 node \u7684 waitStatus \u5df2\u7ecf\u662f -1\uff0c\u8fd9\u6b21\u8fd4\u56de<\/p>\n\n\n\n
true<\/p>\n\n\n\n
6. \u8fdb\u5165 parkAndCheckInterrupt\uff0c Thread-1 park\uff08\u7070\u8272\u8868\u793a\uff09<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u518d\u6b21\u6709\u591a\u4e2a\u7ebf\u7a0b\u7ecf\u5386\u4e0a\u8ff0\u8fc7\u7a0b\u7ade\u4e89\u5931\u8d25\uff0c\u53d8\u6210\u8fd9\u4e2a\u6837\u5b50<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
Thread-0 \u91ca\u653e\u9501\uff0c\u8fdb\u5165 tryRelease \u6d41\u7a0b\uff0c\u5982\u679c\u6210\u529f<\/p>\n\n\n\n
\u8bbe\u7f6e exclusiveOwnerThread \u4e3a null<\/p>\n\n\n\n
state = 0<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u5f53\u524d\u961f\u5217\u4e0d\u4e3a null\uff0c\u5e76\u4e14 head \u7684 waitStatus = -1\uff0c\u8fdb\u5165 unparkSuccessor \u6d41\u7a0b<\/p>\n\n\n\n
\u627e\u5230\u961f\u5217\u4e2d\u79bb head \u6700\u8fd1\u7684\u4e00\u4e2a Node\uff08\u6ca1\u53d6\u6d88\u7684\uff09\uff0cunpark \u6062\u590d\u5176\u8fd0\u884c\uff0c\u672c\u4f8b\u4e2d\u5373\u4e3a Thread-1<\/p>\n\n\n\n
\u56de\u5230 Thread-1 \u7684 acquireQueued \u6d41\u7a0b<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u5982\u679c\u52a0\u9501\u6210\u529f\uff08\u6ca1\u6709\u7ade\u4e89\uff09\uff0c\u4f1a\u8bbe\u7f6e<\/p>\n\n\n\n
exclusiveOwnerThread \u4e3a Thread-1\uff0cstate = 1<\/p>\n\n\n\n
head \u6307\u5411\u521a\u521a Thread-1 \u6240\u5728\u7684 Node\uff0c\u8be5 Node \u6e05\u7a7a Thread<\/p>\n\n\n\n
\u539f\u672c\u7684 head \u56e0\u4e3a\u4ece\u94fe\u8868\u65ad\u5f00\uff0c\u800c\u53ef\u88ab\u5783\u573e\u56de\u6536<\/p>\n\n\n\n
\u5982\u679c\u8fd9\u65f6\u5019\u6709\u5176\u5b83\u7ebf\u7a0b\u6765\u7ade\u4e89\uff08\u975e\u516c\u5e73\u7684\u4f53\u73b0\uff09\uff0c\u4f8b\u5982\u8fd9\u65f6\u6709 Thread-4 \u6765\u4e86<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u5982\u679c\u4e0d\u5de7\u53c8\u88ab Thread-4 \u5360\u4e86\u5148<\/p>\n\n\n\n
Thread-4 \u88ab\u8bbe\u7f6e\u4e3a exclusiveOwnerThread\uff0cstate = 1<\/p>\n\n\n\n
Thread-1 \u518d\u6b21\u8fdb\u5165 acquireQueued \u6d41\u7a0b\uff0c\u83b7\u53d6\u9501\u5931\u8d25\uff0c\u91cd\u65b0\u8fdb\u5165 park \u963b\u585e<\/p>\n\n\n\n
\u52a0\u9501\u6e90\u7801<\/strong><\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div>
\u6ce8\u610f<\/strong>
\u662f\u5426\u9700\u8981 unpark \u662f\u7531\u5f53\u524d\u8282\u70b9\u7684\u524d\u9a71\u8282\u70b9\u7684 waitStatus == Node.SIGNAL \u6765\u51b3\u5b9a\uff0c\u800c\u4e0d\u662f\u672c\u8282\u70b9\u7684
waitStatus \u51b3\u5b9a<\/figcaption><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
2. \u53ef\u91cd\u5165\u539f\u7406<\/strong><\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
3. <\/strong>\u53ef\u6253\u65ad\u539f\u7406<\/strong><\/p>\n\n\n\n
\u4e0d\u53ef\u6253\u65ad\u6a21\u5f0f<\/strong><\/p>\n\n\n\n
\u5728\u6b64\u6a21\u5f0f\u4e0b\uff0c\u5373\u4f7f\u5b83\u88ab\u6253\u65ad\uff0c\u4ecd\u4f1a\u9a7b\u7559\u5728 AQS \u961f\u5217\u4e2d\uff0c\u4e00\u76f4\u8981\u7b49\u5230\u83b7\u5f97\u9501\u540e\u65b9\u80fd\u5f97\u77e5\u81ea\u5df1\u88ab\u6253\u65ad\u4e86<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u53ef\u6253\u65ad\u6a21\u5f0f<\/strong><\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
4. \u516c\u5e73\u9501\u5b9e\u73b0\u539f\u7406<\/strong><\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
5. <\/strong>\u6761\u4ef6\u53d8\u91cf\u5b9e\u73b0\u539f\u7406<\/strong><\/p>\n\n\n\n
\u6bcf\u4e2a\u6761\u4ef6\u53d8\u91cf\u5176\u5b9e\u5c31\u5bf9\u5e94\u7740\u4e00\u4e2a\u7b49\u5f85\u961f\u5217\uff0c\u5176\u5b9e\u73b0\u7c7b\u662f ConditionObject<\/p>\n\n\n\n
await <\/strong>\u6d41\u7a0b<\/strong><\/p>\n\n\n\n
\u5f00\u59cb Thread-0 \u6301\u6709\u9501\uff0c\u8c03\u7528 await\uff0c\u8fdb\u5165 ConditionObject \u7684 addConditionWaiter \u6d41\u7a0b<\/p>\n\n\n\n
\u521b\u5efa\u65b0\u7684 Node \u72b6\u6001\u4e3a -2\uff08Node.CONDITION\uff09\uff0c\u5173\u8054 Thread-0\uff0c\u52a0\u5165\u7b49\u5f85\u961f\u5217\u5c3e\u90e8<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u63a5\u4e0b\u6765\u8fdb\u5165 AQS \u7684 fullyRelease \u6d41\u7a0b\uff0c\u91ca\u653e\u540c\u6b65\u5668\u4e0a\u7684\u9501<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
unpark AQS \u961f\u5217\u4e2d\u7684\u4e0b\u4e00\u4e2a\u8282\u70b9\uff0c\u7ade\u4e89\u9501\uff0c\u5047\u8bbe\u6ca1\u6709\u5176\u4ed6\u7ade\u4e89\u7ebf\u7a0b\uff0c\u90a3\u4e48 Thread-1 \u7ade\u4e89\u6210\u529f<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
park \u963b\u585e Thread-0<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
signal <\/strong>\u6d41\u7a0b<\/strong><\/p>\n\n\n\n
\u5047\u8bbe Thread-1 \u8981\u6765\u5524\u9192 Thread-0<\/p>\n\n\n\n
\"\"<\/div>
\u8fdb\u5165 ConditionObject \u7684 doSignal \u6d41\u7a0b\uff0c\u53d6\u5f97\u7b49\u5f85\u961f\u5217\u4e2d\u7b2c\u4e00\u4e2a Node\uff0c\u5373 Thread-0 \u6240\u5728 Node<\/figcaption><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\u6267\u884c transferForSignal \u6d41\u7a0b\uff0c\u5c06\u8be5 Node \u52a0\u5165 AQS \u961f\u5217\u5c3e\u90e8\uff0c\u5c06 Thread-0 \u7684 waitStatus \u6539\u4e3a 0\uff0cThread-3 \u7684<\/p>\n\n\n\n
waitStatus \u6539\u4e3a -1<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
Thread-1 \u91ca\u653e\u9501\uff0c\u8fdb\u5165 unlock \u6d41\u7a0b\uff0c\u7565<\/p>\n\n\n\n
<\/p>\n\n\n\n
3. <\/strong>\u8bfb\u5199\u9501<\/strong><\/p>\n\n\n\n
3.1 ReentrantReadWriteLock<\/strong><\/p>\n\n\n\n
\u5f53\u8bfb\u64cd\u4f5c\u8fdc\u8fdc\u9ad8\u4e8e\u5199\u64cd\u4f5c\u65f6\uff0c\u8fd9\u65f6\u5019\u4f7f\u7528 \u8bfb\u5199\u9501 \u8ba9 \u8bfb-\u8bfb \u53ef\u4ee5\u5e76\u53d1\uff0c\u63d0\u9ad8\u6027\u80fd\u3002 \u7c7b\u4f3c\u4e8e\u6570\u636e\u5e93\u4e2d\u7684 select …<\/p>\n\n\n\n
from … lock in share mode<\/p>\n\n\n\n
\u63d0\u4f9b\u4e00\u4e2a \u6570\u636e\u5bb9\u5668\u7c7b \u5185\u90e8\u5206\u522b\u4f7f\u7528\u8bfb\u9501\u4fdd\u62a4\u6570\u636e\u7684 read() \u65b9\u6cd5\uff0c\u5199\u9501\u4fdd\u62a4\u6570\u636e\u7684 write() \u65b9\u6cd5<\/p>\n\n\n\n
package com.example.juc.cn8;\n\nimport lombok.extern.slf4j.Slf4j;\n\nimport java.util.concurrent.locks.ReentrantReadWriteLock;\n\n@Slf4j\npublic class TestReadWriteLock {\n    public static void main(String[] args) {\n        DataContainer dataContainer = new DataContainer();\n        new Thread(() ->{\n            dataContainer.read();\n        },\"t1\").start();\n        new Thread(() ->{\n            dataContainer.read();\n        },\"t2\").start();\n    }\n\n}\n@Slf4j\nclass DataContainer{\n    private Object data;\n    private ReentrantReadWriteLock rw = new ReentrantReadWriteLock();\n    private ReentrantReadWriteLock.ReadLock r = rw.readLock();\n    private ReentrantReadWriteLock.WriteLock w = rw.writeLock();\n\n    public Object read(){\n        log.debug(\"\u83b7\u53d6\u8bfb\u9501\");\n        r.lock();\n        try {\n            log.debug(\"\u8bfb\u53d6\");\n            Thread.sleep(1000);\n        } catch (Exception e) {\n            e.printStackTrace();\n        }finally {\n            log.debug(\"\u91ca\u653e\u8bfb\u9501\");\n            r.unlock();\n        }\n        return data;\n    }\n\n    public void write(){\n        w.lock();\n        try {\n            log.debug(\"\u5199\u5165\");\n        } catch (Exception e) {\n            e.printStackTrace();\n        }finally {\n            w.unlock();\n        }\n\n    }\n}\n<\/code><\/pre>\n\n\n\n
 <\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
package com.example.juc.cn8;\n\nimport lombok.extern.slf4j.Slf4j;\n\nimport java.util.concurrent.locks.ReentrantReadWriteLock;\n\n@Slf4j\npublic class TestReadWriteLock {\n    public static void main(String[] args) {\n        DataContainer dataContainer = new DataContainer();\n        new Thread(() ->{\n            dataContainer.read();\n        },\"t1\").start();\n        new Thread(() ->{\n            dataContainer.write();\n        },\"t2\").start();\n    }\n\n}\n@Slf4j\nclass DataContainer{\n    private Object data;\n    private ReentrantReadWriteLock rw = new ReentrantReadWriteLock();\n    private ReentrantReadWriteLock.ReadLock r = rw.readLock();\n    private ReentrantReadWriteLock.WriteLock w = rw.writeLock();\n\n    public Object read(){\n        log.debug(\"\u83b7\u53d6\u8bfb\u9501\");\n        r.lock();\n        try {\n            log.debug(\"\u8bfb\u53d6\");\n            Thread.sleep(1000);\n        } catch (Exception e) {\n            e.printStackTrace();\n        }finally {\n            log.debug(\"\u91ca\u653e\u8bfb\u9501\");\n            r.unlock();\n        }\n        return data;\n    }\n\n    public void write(){\n        log.debug(\"\u83b7\u53d6\u5199\u5165\u9501\");\n        w.lock();\n        try {\n            log.debug(\"\u5199\u5165\");\n        } catch (Exception e) {\n            e.printStackTrace();\n        }finally {\n            log.debug(\"\u91ca\u653e\u5199\u9501 \");\n            w.unlock();\n        }\n\n    }\n}\n<\/code><\/pre>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
4. Semaphore<\/strong><\/p>\n\n\n\n
\u57fa\u672c\u4f7f\u7528<\/strong><\/p>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
\"\"<\/div><\/figure>\n\n\n\n
<\/p>\n\n\n\n
\"\"<\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"
8.1 \u7ebf\u7a0b\u6c60 1. \u81ea\u5b9a\u4e49\u7ebf\u7a0b\u6c60 \u6b65\u9aa41\uff1a\u81ea\u5b9a\u4e49\u62d2\u7edd\u7b56\u7565\u63a5\u53e3 \u624b\u5199\u7ebf\u7a0b\u6c60 2. ThreadPoolExec […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","footnotes":""},"categories":[78],"tags":[],"class_list":["post-1460","post","type-post","status-publish","format-standard","hentry","category-juc"],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false},"uagb_author_info":{"display_name":"xiaofeng","author_link":"http:\/\/shuaihui.icu\/index.php\/author\/xiaofeng\/"},"uagb_comment_info":0,"uagb_excerpt":"8.1 \u7ebf\u7a0b\u6c60 1. \u81ea\u5b9a\u4e49\u7ebf\u7a0b\u6c60 \u6b65\u9aa41\uff1a\u81ea\u5b9a\u4e49\u62d2\u7edd\u7b56\u7565\u63a5\u53e3 \u624b\u5199\u7ebf\u7a0b\u6c60 2. ThreadPoolExec…","_links":{"self":[{"href":"http:\/\/shuaihui.icu\/index.php\/wp-json\/wp\/v2\/posts\/1460","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/shuaihui.icu\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/shuaihui.icu\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/shuaihui.icu\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/shuaihui.icu\/index.php\/wp-json\/wp\/v2\/comments?post=1460"}],"version-history":[{"count":6,"href":"http:\/\/shuaihui.icu\/index.php\/wp-json\/wp\/v2\/posts\/1460\/revisions"}],"predecessor-version":[{"id":1567,"href":"http:\/\/shuaihui.icu\/index.php\/wp-json\/wp\/v2\/posts\/1460\/revisions\/1567"}],"wp:attachment":[{"href":"http:\/\/shuaihui.icu\/index.php\/wp-json\/wp\/v2\/media?parent=1460"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/shuaihui.icu\/index.php\/wp-json\/wp\/v2\/categories?post=1460"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/shuaihui.icu\/index.php\/wp-json\/wp\/v2\/tags?post=1460"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}