Changeset 14246 in vbox for trunk/include

Timestamp:

Nov 17, 2008 11:03:40 AM (16 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

39388

Message:

ASMAtomicSubS32/U32.

File:

• trunk/include/iprt/asm.h (modified) (1 diff)

trunk/include/iprt/asm.h

@@ -3340 +3340 @@
 
 /**
+ * Atomically exchanges and subtracts to an unsigned 32-bit value, ordered.
+ *
+ * @returns The old value.
+ * @param   pu32        Pointer to the value.
+ * @param   u32         Number to subtract.
+ */
+DECLINLINE(uint32_t) ASMAtomicSubU32(int32_t volatile *pi32, uint32_t u32)
+{
+    return ASMAtomicAddU32((uint32_t volatile *)pi32, (uint32_t)-(int32_t)u32);
+}
+
+
+/**
+ * Atomically exchanges and subtracts to a signed 32-bit value, ordered.
+ *
+ * @returns The old value.
+ * @param   pi32        Pointer to the value.
+ * @param   i32         Number to subtract.
+ */
+DECLINLINE(int32_t) ASMAtomicSubS32(int32_t volatile *pi32, int32_t i32)
+{
+    return (int32_t)ASMAtomicAddU32((uint32_t volatile *)pi32, (uint32_t)-i32);
+}
+
+
+/**
  * Atomically increment a 32-bit value, ordered.
  *