Raaf wrote this message on Mon, Feb 06, 2006 at 22:54 +0100: > Hi, i am working on a usb driver that allocates some memory when > the device is opened using malloc. > > Now i want user processes to be able to access this memory using > mmap and i want to free this memory when it is no longer needed. > > The problem is that there seems to be no way of knowing for my > driver at what time the memory is no longer mapped in a process > address space so that i can safely free this memory.
why not at close time? I would imagine that the device won't be closed until all the mmap's that are backed by the device are unmapped.. it shouldn't be hard to test... the mapping should hold a reference to the device until it's munmapped.. -- John-Mark Gurney Voice: +1 415 225 5579 "All that I will do, has been done, All that I have, has not." _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"