我想要使用显式锁定/条件变量(这是一个授权此风格的课程项目)具有此类工作流程:A是主类,它要求B做一些工作时。 B有一个工人阶级C,他不断向B询问有关新工作的事情。 C完成后,它将调用A的回调函数来通知A该作业已完成。IllegalMonitorStateException引发显式锁定/条件
但是当我尝试运行该程序时,当callback()试图通知doit()函数时,我得到一个IllegalMonitorStateException。
exception in thread "Thread-0" java.lang.IllegalMonitorStateException
at java.lang.Object.notifyAll(Native Method)
at Test$A.callback(Test.java:49)
at Test$C.run(Test.java:115)
我看着javadoc和有关此异常的一些问答& A,但仍然不知道为什么我得到这个。
import java.util.*;
import java.util.concurrent.locks.ReentrantLock;
import java.util.concurrent.locks.Condition;
public class Test {
public class A
{
private ReentrantLock lock;
private Condition cond;
private boolean bool;
private B b;
public A()
{
this.lock = new ReentrantLock();
this.cond = lock.newCondition();
b = new B(this);
bool = false;
}
public void doit()
{
try {
lock.lock();
b.letgo();
while (!bool) {
System.out.println("A::doit() Block.");
cond.awaitUninterruptibly();
}
System.out.println("A::doit() Done.");
}
finally {
lock.unlock();
}
}
public void callback() {
try {
lock.lock();
bool = true;
cond.notify();
System.out.println("A::callback() done.");
}
finally {
lock.unlock();
}
}
}
public class B
{
private C c;
private ReentrantLock lock;
private Condition cond;
private boolean bool;
public B(A a)
{
this.lock = new ReentrantLock();
this.cond = lock.newCondition();
bool = false;
c = new C(a, this);
c.start();
}
public void letgo()
{
try {
lock.lock();
bool = true;
}
finally {
lock.unlock();
}
}
public void get()
{
try {
lock.lock();
while (!bool) {
cond.awaitUninterruptibly();
}
bool = false;
return;
}
finally {
lock.unlock();
}
}
}
public class C extends Thread
{
private A a;
private B b;
public C(A a, B b)
{
this.a = a;
this.b = b;
}
public void run()
{
while (true) {
b.get();
a.callback();
}
}
}
public static void main(String args[])
{
Test t = new Test();
t.test1();
}
public void test1()
{
A a = new A();
a.doit();
}
}
哪一行是'at Test $ A.callback(Test.java:49)' – 2009-11-19 01:37:54