Question on checking JNIEnv validity

I am building some C++ classes that will be used by
other people. These classes work with JNI and can be
used in multiple threads (C++ created, not in Java). I
know this means that each thread created needs to get
a valid JNIEnv from the JavaVM.

The problem is that AttachCurrentThread is, I'm
guessing, quite an expensive call. So I want to "know"
when to call it. However, I can't seem to find a
function to tell me if the JNIEnv is valid or not. For
example a function such as EnvIsValid(JavaVM* vm,
JNIEnv* env). Is there a way to tell if the current
JNIEnv is valid without having to reload it?

Thanks!

Don


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