如何知道进程是否真正完成了dlclose()ed库?

I'm on Linux (Ubuntu 12.04, gcc 4.6.3), trying to bend dlopen/close to my will in order to make a plugin-based application that can reload its plugins as and when necessary (e.g. if they're recompiled).I'm on Linux (Ubuntu 12.04, gcc 4.6.3), trying