我想要使用顯式鎖定/條件變量(這是一個授權此風格的課程項目)具有此類工作流程:A是主類,它要求B做一些工作時。 B有一個工人階級C,他不斷向B詢問有關新工作的事情。 C完成後,它將調用A的回調函數來通知A該作業已完成。IllegalMonitorStateException引發顯式鎖定/條件
但是當我嘗試運行該程序時,當callback()試圖通知doit()函數時,我得到一個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和有關此異常的一些問答& A,但仍然不知道爲什麼我得到這個。
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