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PyLock.java
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65 lines (56 loc) · 1.51 KB
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// Copyright (c) Corporation for National Research Initiatives
package org.python.modules.thread;
import org.python.core.PyObject;
import org.python.core.ContextManager;
import org.python.core.Py;
import org.python.core.ThreadState;
import org.python.core.PyException;
import org.python.core.Untraversable;
@Untraversable
public class PyLock extends PyObject implements ContextManager {
private boolean locked = false;
public boolean acquire() {
return acquire(true);
}
public synchronized boolean acquire(boolean waitflag) {
if (waitflag) {
while (locked) {
try {
wait();
} catch (InterruptedException e) {
System.err.println("Interrupted thread");
}
}
locked = true;
return true;
} else {
if (locked) {
return false;
} else {
locked = true;
return true;
}
}
}
public synchronized void release() {
if (locked) {
locked = false;
notifyAll();
} else {
throw Py.ValueError("lock not acquired");
}
}
public boolean locked() {
return locked;
}
@Override
public PyObject __enter__(ThreadState ts) {
acquire();
return this;
}
@Override
public boolean __exit__(ThreadState ts, PyException exception) {
release();
return false;
}
}