[EMAIL PROTECTED] wrote:
>
> Hi,
>
> I got a question on JNI. It would be appreciated if someone could help.
Lee,
I'm having trouble understanding the problem you're posing. What is the
difficulty you're trying to solve... how to call functions in one .so
from another .so? You're already doing that.
Is it the problem of figuring out how to call a function whose name you
do not know until runtime? If so, I think you'll find the
dlopen()/dlsym()/dlclose() functions useful. Other than that
possibility, I'm not quite sure what problem you're trying to solve.
Nathan
>
> Q:
> In order to hide java and jni related issues (e.g. jni function name
> convention, etc.) from .so programmers, a wrapper .so file so1.so is used in
> between java app and another .so file so2.so (the one with native functions
> we need). This way, the java app interacts with the wrapper so1.so
> directly. Every time when java app needs a native function service in
> so2.so, it first calls a native function in so1.so through jni. so1.so, in
> turn, calls the required function in so2.so. Everything works fine in this
> direction (i.e. java app->so1.so->so2.so. java app loads so1.so, and so1.so
> loads so2.so, then java app invokes a function in so2.so through a function
> in so1.so). The question is how a function in so2.so calls back to java app
> through a function in so1.so? In fact, we only need to know how functions
> in so2.so can call functions in so1.so because jni will let us call back to
> java app from so1.so.
>
> More information:
> - the java app is multithreaded application using Thread.start().
> - each java thread may call the same function in so1.so, then
> this function, in turn, calls a function in so2.so
> - native code doesn't create any thread.
>
> Use IPC? which one is easier on Linux? Is there any other mechanism
> for this on Linux?
>
> A simple sample code will help a lot.
>
> Thank you.
>
> Lee
>
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