Date: Mon, 29 Oct 2001 15:00:52 +0000 (GMT) From: Doug Rabson <dfr@nlsystems.com> To: John Baldwin <jhb@FreeBSD.org> Cc: <cvs-committers@FreeBSD.org>, <cvs-all@FreeBSD.org> Subject: Re: cvs commit: src/sys/alpha/alpha trap.c src/sys/i386/i386 trap.c src/sys/ia64/ia64 trap.c src/sys/kern init_main.c kern_exit.c kern_fork.c subr_trap.c src/sys/sparc64/sparc64 trap.c src Message-ID: <Pine.BSF.4.33.0110291459200.41783-100000@herring.nlsystems.com> In-Reply-To: <200110260812.f9Q8CsD14882@freefall.freebsd.org>
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On Fri, 26 Oct 2001, John Baldwin wrote: > jhb 2001/10/26 01:12:54 PDT > > Modified files: > sys/alpha/alpha trap.c > sys/i386/i386 trap.c > sys/ia64/ia64 trap.c > sys/kern init_main.c kern_exit.c kern_fork.c > subr_trap.c > sys/sparc64/sparc64 trap.c > sys/sys proc.h > Log: > Add a per-thread ucred reference for syscalls and synchronous traps from > userland. The per thread ucred reference is immutable and thus needs no > locks to be read. However, until all the proc locking associated with > writes to p_ucred are completed, it is still not safe to use the per-thread > reference. > > Tested on: x86 (SMP), alpha, sparc64 This gets horribly confused when I set a DDB breakpoint at the start of syscall() - it goes into a tight look calling panic because the value of td_ucred is NULL. -- Doug Rabson Mail: dfr@nlsystems.com Phone: +44 20 8348 6160 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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