多线程的Wait返回它等待的下方_JAVA

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多线程的Wait返回它等待的下方

2014/8/15 15:34:44 xmind 程序员俱乐部我要评论(0)

摘要：多线程的Wait返回它等待的下方。JavaCode123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869packageorg.vocano.java.tst;classThreadDemo{publicstaticvoidmain(String[]args)
标签：多线程线程

多线程的Wait返回它等待的下方。
?Java Code? 1
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69 ? package?org.vocano.java.tst;
class?ThreadDemo?{
????public?static?void?main(String[]?args)?{
????????Buffer?buf?=?new?Buffer();
????????new?Producer(buf).start();
????????new?Consumer(buf).start();
????????new?Consumer(buf).start();
????}
}
class?Producer?extends?Thread?{
????private?Buffer?buf;
????public?Producer(Buffer?buf)?{
????????this.buf?=?buf;
????}
????public?void?run()?{
????????boolean?odd?=?false;
????????while(true)?{
????????????synchronized(buf)?{
????????????????System.out.println("Producer?get?lock!");
????????????????if(buf.bFull)?{
????????????????????System.out.println("Producer?wait!!!");
????????????????????try{buf.wait();}catch(Exception?e)?{}
????????????????????System.out.println("Producer?wait?return?return?return?!!!!!!!?");
????????????????}
????????????????if(odd)?{
????????????????????buf.name="jack";????
????????????????????try{Thread.sleep(100);}catch(Exception?e)?{}
????????????????????buf.sex="female";
????????????????}?else?{
????????????????????buf.name="lucy";????
????????????????????try{Thread.sleep(100);}catch(Exception?e)?{}
????????????????????buf.sex="male";
????????????????}
????????????????buf.bFull?=?true;
????????????????buf.notify();
????????????????System.out.println("Producer?release?lock!");
????????????}
????????????odd?=?!odd;
????????}
????}
}
class?Consumer?extends?Thread?{
????private?Buffer?buf;
????public?Consumer(Buffer?buf)?{
????????this.buf?=?buf;
????}
????public?void?run()?{
????????while(true)?{
????????????synchronized(buf)?{
????????????????System.out.println("Consumer?get?lock!");
????????????????if(!buf.bFull)?{
????????????????????System.out.println("Consumer?wait!!!");
????????????????????try{buf.wait();}catch(Exception?e)?{}
????????????????????System.out.println("Consumer?wait?return?return?return?!!!!!!!?");
????????????????}
????????????????try{Thread.sleep(500);}catch(Exception?e)?{}
????????????????System.out.println(buf.name?+?"?:?"?+?buf.sex);
????????????????buf.bFull?=?false;
????????????????buf.notify();
????????????????System.out.println("Consumer?release?lock!");
????????????}
????????}
????}
}
class?Buffer?{
????boolean?bFull?=?false;
????String?name?=?"Unkown";
????String?sex?=?"Unkown";
}
输出：可看出Wait的返回时另一个的wait或者release，不是自己getLock，说明notify放回wait的点。
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19 ? Producer?get?lock!
Producer?release?lock!
Consumer?get?lock!
lucy?:?male
Consumer?release?lock!
Consumer?get?lock!
Consumer?wait!!!
Producer?get?lock!
Producer?release?lock!
Producer?get?lock!
Producer?wait!!!
Consumer?wait?return?return?return?!!!!!!!?
jack?:?female
Consumer?release?lock!
Producer?wait?return?return?return?!!!!!!!?
Producer?release?lock!
Producer?get?lock!
Producer?wait!!!
Consumer?get?lock!
?