On Fri, 22 Jun 2007, Arnd Bergmann wrote: > On Friday 22 June 2007, Florin Iucha wrote: > > I am writing a USB driver for some custom hardware, and I need to > > synchronize between the user-space and the USB subsystem. Can I > > create a semaphore and "down" it in the reader then "up" it in the > > completion handler? > > yes, but you should not. The use of semaphores is not recommended > for new code, it should be replaced with either a mutex or a > completion.
can you clarify this? it sounds like you're saying that the current implementation of semaphores is entirely superfluous. but surely it isn't possible to replace all semaphores with either mutexes or completions, is it? rday -- ======================================================================== Robert P. J. Day Linux Consulting, Training and Annoying Kernel Pedantry Waterloo, Ontario, CANADA http://fsdev.net/wiki/index.php?title=Main_Page ========================================================================
