From 9dc5c269f74ac76f62515e3d9558e67c6e63067d Mon Sep 17 00:00:00 2001
From: Hans Boehm <hboehm@google.com>
Date: Wed, 6 Aug 2014 22:45:13 +0000
Subject: [PATCH] Revert "Remove incorrect android_atomic_...64 use."

This reverts commit 88b7541d682a6ad402eff15e58c9c792497096d7.

Change-Id: Ie701c308451a3697bb167aff119318b932133f90
---
 include/binder/Binder.h |  3 +--
 libs/binder/Binder.cpp  | 32 ++++++++++++++------------------
 2 files changed, 15 insertions(+), 20 deletions(-)

diff --git a/include/binder/Binder.h b/include/binder/Binder.h
index 16f2c4a8e..ba3ac4b99 100644
--- a/include/binder/Binder.h
+++ b/include/binder/Binder.h
@@ -17,7 +17,6 @@
 #ifndef ANDROID_BINDER_H
 #define ANDROID_BINDER_H
 
-#include <stdatomic.h>
 #include <binder/IBinder.h>
 
 // ---------------------------------------------------------------------------
@@ -70,7 +69,7 @@ private:
 
     class Extras;
 
-    atomic_uintptr_t    mExtras;  // should be atomic<Extras *>
+            Extras*     mExtras;
             void*       mReserved0;
 };
 
diff --git a/libs/binder/Binder.cpp b/libs/binder/Binder.cpp
index d9d4971db..71e62ab2b 100644
--- a/libs/binder/Binder.cpp
+++ b/libs/binder/Binder.cpp
@@ -16,7 +16,7 @@
 
 #include <binder/Binder.h>
 
-#include <stdatomic.h>
+#include <utils/Atomic.h>
 #include <utils/misc.h>
 #include <binder/BpBinder.h>
 #include <binder/IInterface.h>
@@ -71,8 +71,8 @@ public:
 // ---------------------------------------------------------------------------
 
 BBinder::BBinder()
+    : mExtras(NULL)
 {
-    atomic_init(&mExtras, 0);
 }
 
 bool BBinder::isBinderAlive() const
@@ -139,19 +139,19 @@ void BBinder::attachObject(
     const void* objectID, void* object, void* cleanupCookie,
     object_cleanup_func func)
 {
-    Extras* e = reinterpret_cast<Extras*>(
-                    atomic_load_explicit(&mExtras, memory_order_acquire));
+    Extras* e = mExtras;
 
     if (!e) {
         e = new Extras;
-        uintptr_t* expected = 0;
-        if (!atomic_compare_exchange_strong_explicit(
-                                        &mExtras, &expected,
-                                        reinterpret_cast<uintptr_t>(e),
-                                        memory_order_release,
-                                        memory_order_acquire)) {
+#ifdef __LP64__
+        if (android_atomic_release_cas64(0, reinterpret_cast<int64_t>(e),
+                reinterpret_cast<volatile int64_t*>(&mExtras)) != 0) {
+#else
+        if (android_atomic_cmpxchg(0, reinterpret_cast<int32_t>(e),
+                reinterpret_cast<volatile int32_t*>(&mExtras)) != 0) {
+#endif
             delete e;
-            e = reinterpret_cast<Extras*>(expected);  // Filled in by CAS
+            e = mExtras;
         }
         if (e == 0) return; // out of memory
     }
@@ -162,8 +162,7 @@ void BBinder::attachObject(
 
 void* BBinder::findObject(const void* objectID) const
 {
-    Extras* e = reinterpret_cast<Extras*>(
-                    atomic_load_explicit(&mExtras, memory_order_acquire));
+    Extras* e = mExtras;
     if (!e) return NULL;
 
     AutoMutex _l(e->mLock);
@@ -172,8 +171,7 @@ void* BBinder::findObject(const void* objectID) const
 
 void BBinder::detachObject(const void* objectID)
 {
-    Extras* e = reinterpret_cast<Extras*>(
-                    atomic_load_explicit(&mExtras, memory_order_acquire));
+    Extras* e = mExtras;
     if (!e) return;
 
     AutoMutex _l(e->mLock);
@@ -187,9 +185,7 @@ BBinder* BBinder::localBinder()
 
 BBinder::~BBinder()
 {
-    Extras* e = reinterpret_cast<Extras*>(
-                    atomic_load_explicit(&mExtras, memory_order_relaxed));
-    if (e) delete e;
+    if (mExtras) delete mExtras;
 }