【设计篇】线程与并发

    对象是过程的抽象，线程是调度的抽象；

    分离并发和业务代码：生产者-消费者、读者写者模型、宴席哲学家问题（筷子问题）

• 互斥
• 线程饥饿
• 死锁
• 活锁

　　【调度的体现】

　　多线程编程优化的时候，yield有小妙用，马上放弃自己！让出调度

 1  /**
 2      * A hint to the scheduler that the current thread is willing to yield
 3      * its current use of a processor. The scheduler is free to ignore this
 4      * hint.
 5      *
 6      * <p> Yield is a heuristic attempt to improve relative progression
 7      * between threads that would otherwise over-utilise a CPU. Its use
 8      * should be combined with detailed profiling and benchmarking to
 9      * ensure that it actually has the desired effect.
10      *
11      * <p> It is rarely appropriate to use this method. It may be useful
12      * for debugging or testing purposes, where it may help to reproduce
13      * bugs due to race conditions. It may also be useful when designing
14      * concurrency control constructs such as the ones in the
15      * {@link java.util.concurrent.locks} package.
16      */
17     public static native void yield();