Java HotSpot Virtual Machine

Hello,

I'm experimenting with modifiying our Windows application such that the front end graphical interface is recoded in Java and the existing back-end calculation engine remains in C/C++ code.

The calculation engine is implemented such that if the computer has one cpu, the execution is performed without use of any critical sections (at least in the calculation engine). If the computer has more than one processor, various segments in the code execute in parallel; using boost::mutex, and various other boost classes, to permit each thread to report information/progress.

The calculation engine is currently being compiled for Windows and Linux platforms. On both Linux and Windows, it appears that calling back to the Java graphical end through JNI calls, while in a native critcal section, causes a crash in the virtual machine. It is probably worth noting that on the Java side, the object that is called back to is an extension of the Thread class.

Is continuing to use a native critial section concurently with calls through JNI incorrect?

Thank you for any assistance,