Fuchsia: Initial check-in.

runtime/vm/atomic_fuchsia.h

Index: runtime/vm/atomic_fuchsia.h
diff --git a/runtime/vm/atomic_android.h b/runtime/vm/atomic_fuchsia.h
similarity index 64%
copy from runtime/vm/atomic_android.h
copy to runtime/vm/atomic_fuchsia.h
index 689173a2ac65783aeddafc5828e455bf8c5644c5..d6c0f57b9d698d6cdb0a9a4a9d36074f558f55b2 100644
--- a/runtime/vm/atomic_android.h
+++ b/runtime/vm/atomic_fuchsia.h
@@ -1,43 +1,46 @@
-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-#ifndef VM_ATOMIC_ANDROID_H_
-#define VM_ATOMIC_ANDROID_H_
+#ifndef VM_ATOMIC_FUCHSIA_H_
+#define VM_ATOMIC_FUCHSIA_H_
 
 #if !defined VM_ATOMIC_H_
-#error Do not include atomic_android.h directly. Use atomic.h instead.
+#error Do not include atomic_fuchsia.h directly. Use atomic.h instead.
 #endif
 
-#if !defined(TARGET_OS_ANDROID)
-#error This file should only be included on Android builds.
+#if !defined(TARGET_OS_FUCHSIA)
+#error This file should only be included on Fuchsia builds.
 #endif
 
-namespace dart {
+#include "platform/assert.h"
 
+namespace dart {
 
 inline uintptr_t AtomicOperations::FetchAndIncrement(uintptr_t* p) {
-  return __sync_fetch_and_add(p, 1);
+  UNIMPLEMENTED();
+  return 0;
 }
 
 
 inline void AtomicOperations::IncrementBy(intptr_t* p, intptr_t value) {
-  __sync_fetch_and_add(p, value);
+  UNIMPLEMENTED();
 }
 
 
 inline void AtomicOperations::IncrementInt64By(int64_t* p, int64_t value) {
-  __sync_fetch_and_add(p, value);
+  UNIMPLEMENTED();
 }
 
 
 inline uintptr_t AtomicOperations::FetchAndDecrement(uintptr_t* p) {
-  return __sync_fetch_and_sub(p, 1);
+  UNIMPLEMENTED();
+  return 0;
 }
 
 
 inline void AtomicOperations::DecrementBy(intptr_t* p, intptr_t value) {
-  __sync_fetch_and_sub(p, value);
+  UNIMPLEMENTED();
 }
 
 
@@ -45,17 +48,19 @@ inline void AtomicOperations::DecrementBy(intptr_t* p, intptr_t value) {
 inline uword AtomicOperations::CompareAndSwapWord(uword* ptr,
                                                   uword old_value,
                                                   uword new_value) {
-  return __sync_val_compare_and_swap(ptr, old_value, new_value);
+  UNIMPLEMENTED();
+  return 0;
 }
 
 
 inline uint32_t AtomicOperations::CompareAndSwapUint32(uint32_t* ptr,
                                                        uint32_t old_value,
                                                        uint32_t new_value) {
-  return __sync_val_compare_and_swap(ptr, old_value, new_value);
+  UNIMPLEMENTED();
+  return 0;
 }
 #endif  // !defined(USING_SIMULATOR_ATOMICS)
 
 }  // namespace dart
 
-#endif  // VM_ATOMIC_ANDROID_H_
+#endif  // VM_ATOMIC_FUCHSIA_H_