Changeset 73a4bab in mainline for arch/ia32/include

Timestamp:

2005-11-11T14:06:55Z (20 years ago)

Author:

Jakub Vana <jakub.vana@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

8a0b3730

Parents:

0172eba

Message:

Atomic inc & dec functions synchronized on all ia32,ia64 and mips platforms. Now there are 3 versions which returns no value, new value and old value och changed variable.

File:

• arch/ia32/include/atomic.h (modified) (3 diffs)

arch/ia32/include/atomic.h

@@ -36 +36 @@
 static inline void atomic_inc(atomic_t *val) {
 #ifdef CONFIG_SMP
-        __asm__ volatile ("lock incl %0\n" : "=m" (*val));
+        __asm__ volatile ("lock incl %0\n" : "+m" (*val));
 #else
-        __asm__ volatile ("incl %0\n" : "=m" (*val));
+        __asm__ volatile ("incl %0\n" : "+m" (*val));
 #endif /* CONFIG_SMP */
 }
@@ -44 +44 @@
 static inline void atomic_dec(atomic_t *val) {
 #ifdef CONFIG_SMP
-        __asm__ volatile ("lock decl %0\n" : "=m" (*val));
+        __asm__ volatile ("lock decl %0\n" : "+m" (*val));
 #else
-        __asm__ volatile ("decl %0\n" : "=m" (*val));
+        __asm__ volatile ("decl %0\n" : "+m" (*val));
 #endif /* CONFIG_SMP */
 }
+
+static inline atomic_t atomic_inc_pre(atomic_t *val) 
+{
+        atomic_t r;
+        __asm__ volatile (
+                "movl $1,%0;"
+                "lock xaddl %0,%1;"
+                : "=r"(r), "+m" (*val)
+        );
+        return r;
+}
+
+
+
+static inline atomic_t atomic_dec_pre(atomic_t *val) 
+{
+        atomic_t r;
+        __asm__ volatile (
+                "movl $-1,%0;"
+                "lock xaddl %0,%1;"
+                : "=r"(r), "+m" (*val)
+        );
+        return r;
+}
+
+#define atomic_inc_post(val) (atomic_inc_pre(val)+1)
+#define atomic_dec_post(val) (atomic_dec_pre(val)-1)
+
+
 
 static inline int test_and_set(volatile int *val) {
@@ -56 +85 @@
                 "movl $1, %0\n"
                 "xchgl %0, %1\n"
-                : "=r" (v),"=m" (*val)
+                : "=r" (v),"+m" (*val)
         );