Self Compile Mechanism
	void OpenJIT_compile(struct methodblock *mb) {     COMPILE_LOCK(); /* for multi-threading */     if (COMPILE_ON_THE_WAY(mb)) {           /* avoid from double compiling */       COMPILE_UNLOCK();           mb->invoker(...); /* invoke interpreter */       return;     }     SET_COMPILE_ON_THE_WAY(mb);     /* this method should be temporarily interpreted */     mb->invoker = “JDK’s invoker”;     COMPILE_UNLOCK();     /* compilation process */     …     /* next time, compiled code is direct called */     mb->invoker = “compiled code”;     RESET_COMPILE_ON_THE_WAY(mb);     mb->invoker(…); /* jump into compiled code */ }