X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;ds=sidebyside;f=base-target-features.lisp-expr;h=0dad915cb25ea7860854c43fc2f0f4f5c8b7910b;hb=e8d94e7c0f7efc78627e6347d4441f4176e8d160;hp=207a04fd36429b20f059c3b72cd99ab9bc74eca2;hpb=5930ee54090c03d242c70716683b12b95d74a089;p=sbcl.git

diff --git a/base-target-features.lisp-expr b/base-target-features.lisp-expr
index 207a04f..0dad915 100644
--- a/base-target-features.lisp-expr
+++ b/base-target-features.lisp-expr
@@ -159,16 +159,27 @@
  ;; Note that no consistent effort to audit the SBCL library code for
  ;; thread safety has been performed, so caveat executor.
  ; :sb-thread
+
+ ;; Kernel support for futexes (so-called "fast userspace mutexes") is
+ ;; available in Linux 2.6 and some versions of 2.4 (Red Hat vendor
+ ;; kernels, possibly other vendors too).  We can take advantage of
+ ;; these to do faster and probably more reliable mutex and condition
+ ;; variable support.  An SBCL built with this feature will fall back
+ ;; to the old system if the futex() syscall is not available at
+ ;; runtime
+ ; :sb-futex
+
+ ;; Support for detection of unportable code (when applied to the
+ ;; COMMON-LISP package, or SBCL-internal pacakges) or bad-neighbourly
+ ;; code (when applied to user-level packages), relating to material
+ ;; alteration to packages or to bindings in symbols in packages.
+ :sb-package-locks
  
  ;; This affects the definition of a lot of things in bignum.lisp. It
  ;; doesn't seem to be documented anywhere what systems it might apply
  ;; to. It doesn't seem to be needed for X86 systems anyway.
  ; :32x16-divide
 
- ;; This is probably true for some processor types, but not X86. It
- ;; affects a lot of floating point code.
- ; :negative-zero-is-not-zero
-
  ;; This is set in classic CMU CL, and presumably there it means
  ;; that the floating point arithmetic implementation
  ;; conforms to IEEE's standard. Here it definitely means that the
@@ -272,6 +283,7 @@
  ;;              particular version of BSD we're intended to run under.)
  ;;   :freebsd = We're intended to run under FreeBSD.
  ;;   :openbsd = We're intended to run under OpenBSD.
+ ;;   :netbsd  = We're intended to run under NetBSD.
  ;;   :sunos   = We're intended to run under Solaris user environment
  ;;              with the SunOS kernel.
  ;;   :osf1    = We're intended to run under Tru64 (aka Digital Unix