Changeset 8d04f709 in mainline

Timestamp:

2009-12-02T23:26:20Z (15 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

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

Children:

84b14e2

Parents:

e15e0e8

Message:

Add dummy implementation of arm32 cas.

The arm32 uspace atomic functions are still not atomic and
some of them are still broken as before, but at least it
compiles.

File:

• uspace/lib/libc/arch/arm32/include/atomic.h (modified) (2 diffs)

uspace/lib/libc/arch/arm32/include/atomic.h

@@ -37 +37 @@
 #define LIBC_arm32_ATOMIC_H_
 
+#include <bool.h>
+
+typedef struct atomic {
+        volatile long count;
+} atomic_t;
+
+static inline void atomic_set(atomic_t *val, long i)
+{
+        val->count = i;
+}
+
+static inline long atomic_get(atomic_t *val)
+{
+        return val->count;
+}
+
+static inline bool cas(atomic_t *val, long ov, long nv)
+{
+        /* FIXME: is not atomic */
+        if (val->count == ov) {
+                val->count = nv;
+                return true;
+        }
+        return false;
+}
+
 /** Atomic addition.
  *
@@ -49 +75 @@
         volatile long * mem = &(val->count);
 
+        /* FIXME: is not atomic, is broken */
         asm volatile (
         "1:\n"