xnu-792.21.3.tar.gz

[apple/xnu.git] / libkern / gen / OSAtomicOperations.c

diff --git a/libkern/gen/OSAtomicOperations.c b/libkern/gen/OSAtomicOperations.c
index 2167974e5e69b99e2604dac910bec011340877f8..4899091fa47c77ba3e645a30b9421c2b0350397b 100644 (file)
--- a/libkern/gen/OSAtomicOperations.c
+++ b/libkern/gen/OSAtomicOperations.c
@@ -34,6 +34,7 @@ enum {
 };
 #define        NULL 0L
 
+
 /*
  * atomic operations
  *     these are _the_ atomic operations, currently cast atop CompareAndSwap,
@@ -76,7 +77,6 @@ SInt32        OSDecrementAtomic(SInt32 * value)
        return OSAddAtomic(-1, value);
 }
 
-#ifdef CMPXCHG8B
 void * OSDequeueAtomic(void ** inList, SInt32 inOffset)
 {
        void *  oldListHead;
@@ -91,6 +91,7 @@ void *        OSDequeueAtomic(void ** inList, SInt32 inOffset)
                newListHead = *(void **) (((char *) oldListHead) + inOffset);
        } while (! OSCompareAndSwap((UInt32)oldListHead,
                                        (UInt32)newListHead, (UInt32 *)inList));
+       
        return oldListHead;
 }
 
@@ -106,7 +107,7 @@ void        OSEnqueueAtomic(void ** inList, void * inNewLink, SInt32 inOffset)
        } while (! OSCompareAndSwap((UInt32)oldListHead, (UInt32)newListHead,
                                        (UInt32 *)inList));
 }
-#endif /* CMPXCHG8B */
+
 #endif /* !__ppc__ */
 
 static UInt32  OSBitwiseAtomic(UInt32 and_mask, UInt32 or_mask, UInt32 xor_mask, UInt32 * value)