On 19-Feb-02 Terry Lambert wrote: > Julian Elischer wrote: >> The fully safe version of this code is: >> td->td_retval[0] = td->td_ucred->cr_ruid; >> td->td_retval[1] = td->td_ucred->cr_uid; >> return (0); >> >> because td->td_ucred is read-only for it's whole existance. > > ??? > > Are you sure that td->td_ucred can't change in the middle, > to point to a different ucred, as a result of kernel > preemption?
Yes. A thread's ucred pointer is constant teh entire time that it is in the kernel. If we get preempted who cares. We will still be teh same thread when we continue executing. :) -- John Baldwin <[EMAIL PROTECTED]> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
