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Computing with Data

elgeish
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Reentrant Locks - Part II

We may use a binary semaphore to implement a lock for mutual exclusion as in the following code snippet:

import java.util.concurrent.Semaphore;
class ReentrantLockExample {
private final Semaphore lock = new Semaphore(1);
public void foo() throws InterruptedException {
lock.acquire();
try {
// ...
bar();
} finally {
lock.release();
}
}
public void bar() throws InterruptedException {
lock.acquire();
try {
// ...
} finally {
lock.release();
}
}
}
public class Main {
public static void main(String args[]) throws Exception {
new ReentrantLockExample().foo();
}
}
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