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81 lines (70 loc) · 2.03 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;
import org.python.expose.ExposedMethod;
import org.python.expose.ExposedType;
@Untraversable
@ExposedType(name = "_thread.lock")
public class PyLock extends PyObject implements ContextManager {
private boolean locked = false;
public boolean acquire() {
return acquire(true, -1);
}
@ExposedMethod(names = "acquire", defaults = {"true", "-1"})
public synchronized boolean acquire(boolean blocking, int timeout) {
if (blocking) {
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;
}
}
}
@ExposedMethod(names = "release")
public synchronized void release() {
if (locked) {
locked = false;
notifyAll();
} else {
throw Py.ValueError("lock not acquired");
}
}
@ExposedMethod
public boolean lock_locked() {
return locked;
}
@ExposedMethod
public PyObject lock___enter__() {
return __enter__(Py.getThreadState());
}
@Override
public PyObject __enter__(ThreadState ts) {
acquire();
return this;
}
@ExposedMethod
public boolean lock___exit__(PyObject type, PyObject value, PyObject traceback) {
return __exit__(Py.getThreadState(), null);
}
@Override
public boolean __exit__(ThreadState ts, PyException exception) {
release();
return false;
}
}