notes/pl/java/features/monitoring.txt

jlong JNICALL JNIModule::getMemoryUsage(JNIEnv* pEnv, jclass jCls)
{
    try
    {
#if defined(_WIN32) || defined(__WIN32__) || defined(WIN32) || defined(_WINDOWS)
        jlong size = 0;
        _HEAPINFO hInfo;
        int status;
        hInfo._pentry = NULL;
        while ((status = _heapwalk(&hInfo)) == _HEAPOK)
        {
            if (_USEDENTRY == hInfo._useflag)
                size += hInfo._size;
        }
        switch (status)
        {
        case _HEAPEMPTY:
        case _HEAPEND:
            return size;
        default:
            JNIUtils::ThrowJavaException(pEnv, "java/lang/RuntimeException", "Heap corrupted");
        }
#elif defined __unix__
        struct mallinfo mem_info = ::mallinfo();
        return (jlong)mem_info.arena;
#else
    #error "Unsupported platform"
#endif
    }
    catch (...)
    {
        JNIUtils::ThrowJavaException(pEnv, "java/lang/RuntimeException", "Unknown reason");
    }
    return -1;
}