X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fassembly%2Fx86-64%2Falloc.lisp;h=80d5406329a8ba75ebdb934b86a6549ee1d356b2;hb=c553e4be6da2d18f0827f190589c88e837b8b8a6;hp=63444e4590d98b9e7d3d655eeecb02d14641bef7;hpb=e0bacf086afba98465c33f63893d805e86c4f80f;p=sbcl.git

diff --git a/src/assembly/x86-64/alloc.lisp b/src/assembly/x86-64/alloc.lisp
index 63444e4..80d5406 100644
--- a/src/assembly/x86-64/alloc.lisp
+++ b/src/assembly/x86-64/alloc.lisp
@@ -94,7 +94,8 @@
                (emit-label get-tls-index-lock)
                (inst mov target 1)
                (zeroize rax-tn)
-               (inst cmpxchg (make-ea-for-symbol-value *tls-index-lock*) target :lock)
+               (inst cmpxchg (make-ea-for-symbol-value *tls-index-lock*)
+                     target :lock)
                (inst jmp :ne get-tls-index-lock)
                ;; The symbol is now in OTHER.
                (inst pop other)
@@ -105,13 +106,18 @@
                (inst jmp :ne release-tls-index-lock)
                ;; Allocate a new tls-index.
                (load-symbol-value target *free-tls-index*)
-               (let ((error (generate-error-code nil 'tls-exhausted-error)))
+               (let ((not-error (gen-label))
+                     (error (generate-error-code nil 'tls-exhausted-error)))
                  (inst cmp target (fixnumize tls-size))
-                 (inst jmp :ge error))
+                 (inst jmp :l not-error)
+                 (%clear-pseudo-atomic)
+                 (inst jmp error)
+                 (emit-label not-error))
                (inst add (make-ea-for-symbol-value *free-tls-index*)
                      (fixnumize 1))
                (storew target other symbol-tls-index-slot other-pointer-lowtag)
                (emit-label release-tls-index-lock)
+               ;; No need for barriers on x86/x86-64 on unlock.
                (store-symbol-value 0 *tls-index-lock*)
                ;; Restore OTHER.
                (inst pop other))