From f39b560952d3706a7ff47ef0d82c1a836daeea42 Mon Sep 17 00:00:00 2001
From: Hans Boehm <hboehm@google.com>
Date: Wed, 16 Jul 2014 12:13:16 -0700
Subject: Remove 64-bit android_atomic uses from StateQueue.

Use stdatomic.h instead.  We're trying to remove android_atomic use
wherever possible.  The 64-bit uses seem easiest to remove first.
This cleans up the code, though not as much as C++ <atomic> would,
if it worked everywhere.

Change-Id: I3c29bdbd5915cb9d47118834a3a742fe296cf87f
---
 services/audioflinger/StateQueue.cpp | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

(limited to 'services/audioflinger/StateQueue.cpp')

diff --git a/services/audioflinger/StateQueue.cpp b/services/audioflinger/StateQueue.cpp
index 7e01c9f..40d7bcd 100644
--- a/services/audioflinger/StateQueue.cpp
+++ b/services/audioflinger/StateQueue.cpp
@@ -41,13 +41,14 @@ void StateQueueMutatorDump::dump(int fd)
 // Constructor and destructor
 
 template<typename T> StateQueue<T>::StateQueue() :
-    mNext(NULL), mAck(NULL), mCurrent(NULL),
+    mAck(NULL), mCurrent(NULL),
     mMutating(&mStates[0]), mExpecting(NULL),
     mInMutation(false), mIsDirty(false), mIsInitialized(false)
 #ifdef STATE_QUEUE_DUMP
     , mObserverDump(&mObserverDummyDump), mMutatorDump(&mMutatorDummyDump)
 #endif
 {
+    atomic_init(&mNext, 0);
 }
 
 template<typename T> StateQueue<T>::~StateQueue()
@@ -58,11 +59,8 @@ template<typename T> StateQueue<T>::~StateQueue()
 
 template<typename T> const T* StateQueue<T>::poll()
 {
-#ifdef __LP64__
-    const T *next = (const T *) android_atomic_acquire_load64((volatile int64_t *) &mNext);
-#else
-    const T *next = (const T *) android_atomic_acquire_load((volatile int32_t *) &mNext);
-#endif
+    const T *next = (const T *) atomic_load_explicit(&mNext, memory_order_acquire);
+
     if (next != mCurrent) {
         mAck = next;    // no additional barrier needed
         mCurrent = next;
@@ -144,11 +142,7 @@ template<typename T> bool StateQueue<T>::push(StateQueue<T>::block_t block)
         }
 
         // publish
-#ifdef __LP64__
-        android_atomic_release_store64((int64_t) mMutating, (volatile int64_t *) &mNext);
-#else
-        android_atomic_release_store((int32_t) mMutating, (volatile int32_t *) &mNext);
-#endif
+        atomic_store_explicit(&mNext, (uintptr_t)mMutating, memory_order_release);
         mExpecting = mMutating;
 
         // copy with circular wraparound
-- 
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