Changeset 06e1e95 in mainline for uspace/libc/arch/sparc64/include/atomic.h

Timestamp:

2006-09-14T17:09:21Z (19 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

f1d1f5d3

Parents:

e5ecc02

Message:

C99 compliant header guards (hopefully) everywhere in the kernel.
Formatting and indentation changes.
Small improvements in sparc64.

File:

• uspace/libc/arch/sparc64/include/atomic.h (modified) (1 diff)

uspace/libc/arch/sparc64/include/atomic.h

@@ -50 +50 @@
 {
         uint64_t a, b;
-        volatile uint64_t x = (uint64_t) &val->count;
 
-        __asm__ volatile (
-                "0:\n"
-                "ldx %0, %1\n"
-                "add %1, %3, %2\n"
-                "casx %0, %1, %2\n"
-                "cmp %1, %2\n"
-                "bne 0b\n"              /* The operation failed and must be attempted again if a != b. */
-                "nop\n"
-                : "=m" (*((uint64_t *)x)), "=r" (a), "=r" (b)
-                : "r" (i)
-        );
+        do {
+                volatile uintptr_t x = (uint64_t) &val->count;
+
+                a = *((uint64_t *) x);
+                b = a + i;
+                __asm__ volatile ("casx %0, %1, %2\n": "+m" (*((uint64_t *)x)), "+r" (a), "+r" (b));
+        } while (a != b);
 
         return a;