[4671] in java-interest
Re: -No Subject-
daemon@ATHENA.MIT.EDU (Arthur van Hoff)
Wed Jan 10 14:26:09 1996
Date: Wed, 10 Jan 1996 09:41:11 -0800
From: Arthur.Vanhoff@Eng.Sun.COM (Arthur van Hoff)
To: Dean_Burson.LOTUS@crd.lotus.com
Cc: java-interest@java.Eng.Sun.COM
Hi Dean,
> If I call a native C DLL from a java class method, the javaThis pointer is
> is implicitly passed along as the first parameter. I've been using the pointer
> to call back into the java class using execute_java_dynamic_method.
>
> Can the java garbage collector see that the pointer is held by a native
> method?
Yes, but only if it is held in a local variable. Don't put it in a static
variable or a heap data structure.
> Are there scoping rules for using the pointer in the native code?
No, as long as the pointer stays in a local variable. So effectively
they are scoped by the duration of the native method invokation.
> Does the native method run in the same thread as the java method which
> called it?
Yes. The threads are real threads.
> Happy to have it working, I'm curious to know when it will break.
Have fun,
Arthur van Hoff
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