new file mode 100644
--- /dev/null
+++ b/src/os/unix/ngx_gcc_atomic_sparc64.h
@@ -0,0 +1,69 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ */
+
+
+/*
+ * "casa   [r1] 0x80, r2, r0"  and
+ * "casxa  [r1] 0x80, r2, r0"  do the following:
+ *
+ *     if ([r1] == r2) {
+ *         swap(r0, [r1]);
+ *     } else {
+ *         r0 = [r1];
+ *     }
+ *
+ * so "r0 == r2" means that the operation was successfull.
+ *
+ *
+ * The "r" means the general register.
+ * The "+r" means the general register used for both input and output.
+ */
+
+
+#if (NGX_PTR_SIZE == 4)
+#define NGX_CASA  "casa"
+#else
+#define NGX_CASA  "casxa"
+#endif
+
+
+static ngx_inline ngx_atomic_uint_t
+ngx_atomic_cmp_set(ngx_atomic_t *lock, ngx_atomic_uint_t old,
+    ngx_atomic_uint_t set)
+{
+    __asm__ volatile (
+
+    NGX_CASA " [%1] 0x80, %2, %0"
+
+    : "+r" (set) : "r" (lock), "r" (old) : "memory");
+
+    return (set == old);
+}   
+
+
+static ngx_inline ngx_atomic_int_t
+ngx_atomic_fetch_add(ngx_atomic_t *value, ngx_atomic_int_t add)
+{
+    ngx_atomic_uint_t  old, res;
+
+    old = *value;
+
+    for ( ;; ) {
+
+        res = old + add;
+
+        __asm__ volatile (
+
+        NGX_CASA " [%1] 0x80, %2, %0"
+
+        : "+r" (res) : "r" (value), "r" (old) : "memory");
+
+        if (res == old) {
+            return res;
+        }
+
+        old = res;
+    }
+}