+/**
+ * define a standard log function that always writes to stderr
+ *
+ * \param loglevel_barier If the loglevel of the current message
+ * is less than that, the message is going to be ignored.
+ *
+ */
+#define INIT_STDERR_LOGGING(loglevel_barrier) \
+ __printf_2_3 void para_log(int ll, const char* fmt,...) \
+ { \
+ va_list argp; \
+ if (ll < loglevel_barrier) \
+ return; \
+ va_start(argp, fmt); \
+ vfprintf(stderr, fmt, argp); \
+ va_end(argp); \
+ }
+
+