At 11:10 -0700 18/5/03, Shawn Erickson wrote: Can I use OSEnqueueAtomic & OSDequeueAtomic from user mode? No. There are, however, numerous atomic operations available from various user space frameworks. The two that I'm familiar with are those in "DriverSynchronization.h" and "OpenTransport.h". Do not roll your own atomic operations using PowerPC lwarx and stwcx instructions. This recommendation, from an old technote, still applies. DTS recommends that developers avoid using the PowerPC Load Reserved and Store Conditional instructions. There are two reasons for this. Firstly, these instructions are inherently processor-specific and reduce the portability of your code. Secondly, the behavior of these instructions varies between PowerPC CPU types. Accommodating all these variations is tricky. These instructions do not provide much utility beyond that provided by the Open Transport and DriverServicesLib atomic routines, and Apple ensures that these atomic routines are updated to do the right thing in all cases. -- <http://developer.apple.com/technotes/tn/tn1137.html> S+E -- Quinn "The Eskimo!" <http://www.apple.com/developer/> Apple Developer Technical Support * Networking, Communications, Hardware _______________________________________________ darwin-kernel mailing list | darwin-kernel@lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.