44 lines
1.1 KiB
Java
44 lines
1.1 KiB
Java
// concurrency/MultiLock.java
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// (c)2016 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
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// One thread can reacquire the same lock.
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public class MultiLock {
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public synchronized void f1(int count) {
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if(count-- > 0) {
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System.out.println(
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"f1() calling f2() with count " + count);
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f2(count);
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}
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}
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public synchronized void f2(int count) {
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if(count-- > 0) {
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System.out.println(
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"f2() calling f1() with count " + count);
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f1(count);
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}
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}
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public static void main(String[] args) throws Exception {
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final MultiLock multiLock = new MultiLock();
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new Thread() {
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@Override
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public void run() {
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multiLock.f1(10);
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}
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}.start();
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}
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}
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/* Output:
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f1() calling f2() with count 9
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f2() calling f1() with count 8
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f1() calling f2() with count 7
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f2() calling f1() with count 6
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f1() calling f2() with count 5
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f2() calling f1() with count 4
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f1() calling f2() with count 3
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f2() calling f1() with count 2
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f1() calling f2() with count 1
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f2() calling f1() with count 0
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*/
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