Changeset 1995 for Whitix/trunk

Timestamp:

04/02/09 21:04:40 (3 years ago)

Author:

mwhitworth

Message:

Add BitTestAndClear function.

Files:

• Whitix/trunk/include/locks.h (modified) (2 diffs)

Whitix/trunk/include/locks.h

@@ -27 +27 @@
         asm volatile(""
                 "btsl %1, %0"
-                :"=m"(ADDR)
+                :"+m"(ADDR)
                 :"Ir"(bit));
 }
@@ -52 +52 @@
 }
 
+static inline int BitTestAndClear(volatile void* address, int bit)
+{
+        int oldBit;
+        
+        asm volatile(""
+                "btr %2, %1\n\t"
+                "sbb %0, %0"
+                : "=r"(oldBit), "=m"(ADDR)
+                : "Ir"(bit) : "memory");
+                
+        return oldBit;
+}
+
 #endif