I have a java class that has some (private static) synchronized methods which I want to call from native code as well. with some example code it becomes more clear what I mean
public class SomeClass {
private static synchronized void method() {
//do something that needs synchronization
}
}
and the associated native code (C++)
void someFunction(JNIEnv * env) {
jclass someClass = env->findClass("SomeClass");
jmethodID methodId = env->GetStaticMethodID(jclass, "method", "()V");
env->MonitorEnter(jclass); // <--- IS THIS NEEDED/ALLOWED
env->CallStaticVoidMethod(jclass, methodId);
env->MonitorExit(jclass); // <--- IS THIS NEEDED/ALLOWED
}
So what I am wondering is if I need to call MonitorEnter/MonitorExit, or if the method synchronization is enforced already by the synchronized attribute on SomeClass.method(). I am not so much interested in rewriting the code. I can think of a few solutions to work around this, but I am interested in what the behaviour is, given a synchronized method that is called from native code.
Section 8.4.3.6 synchronized Methods of the Java Language Specification says that declaring the method synchronized has the same effect as adding a synchronized block within the method.
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