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JNI and Multi-threading

Java includes a direct support for multi-threading. But the most important part of this support is used through Java methods and Java classes. So, it can be used in native code just by using the technics seens so far. The only syntatic feature uses keyword synchronized to take control of a monitor associated with an object. Thus, the JNI proposes two methods: MonitorEnter and MonitorExit that we can use to indicate the start and the end of a syncronized piece of code.

This class, Register, implements a bounded register, addition is permited only if the value remains betwen the bounds. Otherwise, addition blocks untils the condition (to remain between the bounds) holds.

The native code uses both synchronized code and callbacks to java thread-related methods.

Links to source code :

Makefile

UseRegister.java