In IOLocks.h I can see this: #ifndef IOKIT_DEPRECATED #define IOKIT_DEPRECATED 1 #endif Does that means I shouldn't use it ? If so, is there any API that let me protect a small peace of code (let's say the cay critical section works or the posix sandard). Oh please, telling me to use the commandGate won't help me at all. I NEED this funcionnality. I don't want to enter in the details, but There must be something that does what I need. Francis