Second attempt to "Rewrite atomic.h to use stdatomic.h."

This should not be committed until win_sdk and aarch64 builds are
fixed in the presence of this CL.

This reverts commit 2789faabfa9cdf16902a52a1de3fc4a7ae98efed.

We additionally remove uniprocessor support from the earlier CL,
thus avoiding a potential compiler code reordering issue.

Change-Id: I7207a5ca2efa907a6f757f172d7090a62b2311fe

8 files changed, 112 insertions, 1039 deletions

diff --git a/include/cutils/atomic-arm.h b/include/cutils/atomic-arm.h
deleted file mode 100644
index 6b031b6..0000000
--- a/include/cutils/atomic-arm.h
+++ /dev/null
@@ -1,167 +0,0 @@
-/*
- * Copyright (C) 2010 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef ANDROID_CUTILS_ATOMIC_ARM_H
-#define ANDROID_CUTILS_ATOMIC_ARM_H
-
-#include <stdint.h>
-
-#ifndef ANDROID_ATOMIC_INLINE
-#define ANDROID_ATOMIC_INLINE inline __attribute__((always_inline))
-#endif
-
-extern ANDROID_ATOMIC_INLINE void android_compiler_barrier()
-{
-    __asm__ __volatile__ ("" : : : "memory");
-}
-
-extern ANDROID_ATOMIC_INLINE void android_memory_barrier()
-{
-#if ANDROID_SMP == 0
-    android_compiler_barrier();
-#else
-    __asm__ __volatile__ ("dmb" : : : "memory");
-#endif
-}
-
-extern ANDROID_ATOMIC_INLINE
-int32_t android_atomic_acquire_load(volatile const int32_t *ptr)
-{
-    int32_t value = *ptr;
-    android_memory_barrier();
-    return value;
-}
-
-extern ANDROID_ATOMIC_INLINE
-int32_t android_atomic_release_load(volatile const int32_t *ptr)
-{
-    android_memory_barrier();
-    return *ptr;
-}
-
-extern ANDROID_ATOMIC_INLINE
-void android_atomic_acquire_store(int32_t value, volatile int32_t *ptr)
-{
-    *ptr = value;
-    android_memory_barrier();
-}
-
-extern ANDROID_ATOMIC_INLINE
-void android_atomic_release_store(int32_t value, volatile int32_t *ptr)
-{
-    android_memory_barrier();
-    *ptr = value;
-}
-
-extern ANDROID_ATOMIC_INLINE
-int android_atomic_cas(int32_t old_value, int32_t new_value,
-                       volatile int32_t *ptr)
-{
-    int32_t prev, status;
-    do {
-        __asm__ __volatile__ ("ldrex %0, [%3]\n"
-                              "mov %1, #0\n"
-                              "teq %0, %4\n"
-#ifdef __thumb2__
-                              "it eq\n"
-#endif
-                              "strexeq %1, %5, [%3]"
-                              : "=&r" (prev), "=&r" (status), "+m"(*ptr)
-                              : "r" (ptr), "Ir" (old_value), "r" (new_value)
-                              : "cc");
-    } while (__builtin_expect(status != 0, 0));
-    return prev != old_value;
-}
-
-extern ANDROID_ATOMIC_INLINE
-int android_atomic_acquire_cas(int32_t old_value, int32_t new_value,
-                               volatile int32_t *ptr)
-{
-    int status = android_atomic_cas(old_value, new_value, ptr);
-    android_memory_barrier();
-    return status;
-}
-
-extern ANDROID_ATOMIC_INLINE
-int android_atomic_release_cas(int32_t old_value, int32_t new_value,
-                               volatile int32_t *ptr)
-{
-    android_memory_barrier();
-    return android_atomic_cas(old_value, new_value, ptr);
-}
-
-extern ANDROID_ATOMIC_INLINE
-int32_t android_atomic_add(int32_t increment, volatile int32_t *ptr)
-{
-    int32_t prev, tmp, status;
-    android_memory_barrier();
-    do {
-        __asm__ __volatile__ ("ldrex %0, [%4]\n"
-                              "add %1, %0, %5\n"
-                              "strex %2, %1, [%4]"
-                              : "=&r" (prev), "=&r" (tmp),
-                                "=&r" (status), "+m" (*ptr)
-                              : "r" (ptr), "Ir" (increment)
-                              : "cc");
-    } while (__builtin_expect(status != 0, 0));
-    return prev;
-}
-
-extern ANDROID_ATOMIC_INLINE int32_t android_atomic_inc(volatile int32_t *addr)
-{
-    return android_atomic_add(1, addr);
-}
-
-extern ANDROID_ATOMIC_INLINE int32_t android_atomic_dec(volatile int32_t *addr)
-{
-    return android_atomic_add(-1, addr);
-}
-
-extern ANDROID_ATOMIC_INLINE
-int32_t android_atomic_and(int32_t value, volatile int32_t *ptr)
-{
-    int32_t prev, tmp, status;
-    android_memory_barrier();
-    do {
-        __asm__ __volatile__ ("ldrex %0, [%4]\n"
-                              "and %1, %0, %5\n"
-                              "strex %2, %1, [%4]"
-                              : "=&r" (prev), "=&r" (tmp),
-                                "=&r" (status), "+m" (*ptr)
-                              : "r" (ptr), "Ir" (value)
-                              : "cc");
-    } while (__builtin_expect(status != 0, 0));
-    return prev;
-}
-
-extern ANDROID_ATOMIC_INLINE
-int32_t android_atomic_or(int32_t value, volatile int32_t *ptr)
-{
-    int32_t prev, tmp, status;
-    android_memory_barrier();
-    do {
-        __asm__ __volatile__ ("ldrex %0, [%4]\n"
-                              "orr %1, %0, %5\n"
-                              "strex %2, %1, [%4]"
-                              : "=&r" (prev), "=&r" (tmp),
-                                "=&r" (status), "+m" (*ptr)
-                              : "r" (ptr), "Ir" (value)
-                              : "cc");
-    } while (__builtin_expect(status != 0, 0));
-    return prev;
-}
-
-#endif /* ANDROID_CUTILS_ATOMIC_ARM_H */
diff --git a/include/cutils/atomic-arm64.h b/include/cutils/atomic-arm64.h
deleted file mode 100644
index 7ae47d7..0000000
--- a/include/cutils/atomic-arm64.h
+++ /dev/null
@@ -1,156 +0,0 @@
-/*
- * Copyright (C) 2014 The Android Open Source Project
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *  * Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- *  * Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#ifndef ANDROID_CUTILS_ATOMIC_AARCH64_H
-#define ANDROID_CUTILS_ATOMIC_AARCH64_H
-
-#include <stdint.h>
-
-#ifndef ANDROID_ATOMIC_INLINE
-#define ANDROID_ATOMIC_INLINE inline __attribute__((always_inline))
-#endif
-
-/*
-   TODOAArch64: Revisit the below functions and check for potential
-   optimizations using assembly code or otherwise.
-*/
-
-extern ANDROID_ATOMIC_INLINE
-void android_compiler_barrier(void)
-{
-    __asm__ __volatile__ ("" : : : "memory");
-}
-
-extern ANDROID_ATOMIC_INLINE
-void android_memory_barrier(void)
-{
-    __asm__ __volatile__ ("dmb ish" : : : "memory");
-}
-
-extern ANDROID_ATOMIC_INLINE
-int32_t android_atomic_acquire_load(volatile const int32_t *ptr)
-{
-    int32_t value = *ptr;
-    android_memory_barrier();
-    return value;
-}
-
-extern ANDROID_ATOMIC_INLINE
-int32_t android_atomic_release_load(volatile const int32_t *ptr)
-{
-    android_memory_barrier();
-    return *ptr;
-}
-
-extern ANDROID_ATOMIC_INLINE
-void android_atomic_acquire_store(int32_t value, volatile int32_t *ptr)
-{
-    *ptr = value;
-    android_memory_barrier();
-}
-
-extern ANDROID_ATOMIC_INLINE
-void android_atomic_release_store(int32_t value, volatile int32_t *ptr)
-{
-    android_memory_barrier();
-    *ptr = value;
-}
-
-extern ANDROID_ATOMIC_INLINE
-int android_atomic_cas(int32_t old_value, int32_t new_value,
-                       volatile int32_t *ptr)
-{
-    return __sync_val_compare_and_swap(ptr, old_value, new_value) != old_value;
-}
-
-extern ANDROID_ATOMIC_INLINE
-int android_atomic_acquire_cas(int32_t old_value, int32_t new_value,
-                               volatile int32_t *ptr)
-{
-    int status = android_atomic_cas(old_value, new_value, ptr);
-    android_memory_barrier();
-    return status;
-}
-
-extern ANDROID_ATOMIC_INLINE
-int android_atomic_release_cas(int32_t old_value, int32_t new_value,
-                               volatile int32_t *ptr)
-{
-    android_memory_barrier();
-    return android_atomic_cas(old_value, new_value, ptr);
-}
-
-extern ANDROID_ATOMIC_INLINE
-int32_t android_atomic_add(int32_t increment, volatile int32_t *ptr)
-{
-    int32_t prev, status;
-    android_memory_barrier();
-    do {
-        prev = *ptr;
-        status = android_atomic_cas(prev, prev + increment, ptr);
-    } while (__builtin_expect(status != 0, 0));
-    return prev;
-}
-
-extern ANDROID_ATOMIC_INLINE
-int32_t android_atomic_inc(volatile int32_t *addr)
-{
-    return android_atomic_add(1, addr);
-}
-
-extern ANDROID_ATOMIC_INLINE
-int32_t android_atomic_dec(volatile int32_t *addr)
-{
-    return android_atomic_add(-1, addr);
-}
-
-extern ANDROID_ATOMIC_INLINE
-int32_t android_atomic_and(int32_t value, volatile int32_t *ptr)
-{
-    int32_t prev, status;
-    android_memory_barrier();
-    do {
-        prev = *ptr;
-        status = android_atomic_cas(prev, prev & value, ptr);
-    } while (__builtin_expect(status != 0, 0));
-    return prev;
-}
-
-extern ANDROID_ATOMIC_INLINE
-int32_t android_atomic_or(int32_t value, volatile int32_t *ptr)
-{
-    int32_t prev, status;
-    android_memory_barrier();
-    do {
-        prev = *ptr;
-        status = android_atomic_cas(prev, prev | value, ptr);
-    } while (__builtin_expect(status != 0, 0));
-    return prev;
-}
-
-#endif /* ANDROID_CUTILS_ATOMIC_AARCH64_H */
diff --git a/include/cutils/atomic-inline.h b/include/cutils/atomic-inline.h
index a31e913..103c5b0 100644
--- a/include/cutils/atomic-inline.h
+++ b/include/cutils/atomic-inline.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2010 The Android Open Source Project
+ * Copyright (C) 2014 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,59 +14,6 @@
  * limitations under the License.
  */
 
-#ifndef ANDROID_CUTILS_ATOMIC_INLINE_H
-#define ANDROID_CUTILS_ATOMIC_INLINE_H
-
-#ifdef __cplusplus
-extern "C" {
+#ifndef ANDROID_CUTILS_ATOMIC_H
+#include <cutils/atomic.h>
 #endif
-
-/*
- * Inline declarations and macros for some special-purpose atomic
- * operations.  These are intended for rare circumstances where a
- * memory barrier needs to be issued inline rather than as a function
- * call.
- *
- * Most code should not use these.
- *
- * Anything that does include this file must set ANDROID_SMP to either
- * 0 or 1, indicating compilation for UP or SMP, respectively.
- *
- * Macros defined in this header:
- *
- * void ANDROID_MEMBAR_FULL(void)
- *   Full memory barrier.  Provides a compiler reordering barrier, and
- *   on SMP systems emits an appropriate instruction.
- */
-
-#if !defined(ANDROID_SMP)
-# error "Must define ANDROID_SMP before including atomic-inline.h"
-#endif
-
-#if defined(__aarch64__)
-#include <cutils/atomic-arm64.h>
-#elif defined(__arm__)
-#include <cutils/atomic-arm.h>
-#elif defined(__i386__)
-#include <cutils/atomic-x86.h>
-#elif defined(__x86_64__)
-#include <cutils/atomic-x86_64.h>
-#elif defined(__mips64)
-#include <cutils/atomic-mips64.h>
-#elif defined(__mips__)
-#include <cutils/atomic-mips.h>
-#else
-#error atomic operations are unsupported
-#endif
-
-#if ANDROID_SMP == 0
-#define ANDROID_MEMBAR_FULL android_compiler_barrier
-#else
-#define ANDROID_MEMBAR_FULL android_memory_barrier
-#endif
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* ANDROID_CUTILS_ATOMIC_INLINE_H */
diff --git a/include/cutils/atomic-mips.h b/include/cutils/atomic-mips.h
deleted file mode 100644
index 5d4f097..0000000
--- a/include/cutils/atomic-mips.h
+++ /dev/null
@@ -1,174 +0,0 @@
-/*
- * Copyright (C) 2010 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef ANDROID_CUTILS_ATOMIC_MIPS_H
-#define ANDROID_CUTILS_ATOMIC_MIPS_H
-
-#include <stdint.h>
-
-#ifndef ANDROID_ATOMIC_INLINE
-#define ANDROID_ATOMIC_INLINE inline __attribute__((always_inline))
-#endif
-
-extern ANDROID_ATOMIC_INLINE void android_compiler_barrier(void)
-{
-    __asm__ __volatile__ ("" : : : "memory");
-}
-
-#if ANDROID_SMP == 0
-extern ANDROID_ATOMIC_INLINE void android_memory_barrier(void)
-{
-    android_compiler_barrier();
-}
-#else
-extern ANDROID_ATOMIC_INLINE void android_memory_barrier(void)
-{
-    __asm__ __volatile__ ("sync" : : : "memory");
-}
-#endif
-
-extern ANDROID_ATOMIC_INLINE int32_t
-android_atomic_acquire_load(volatile const int32_t *ptr)
-{
-    int32_t value = *ptr;
-    android_memory_barrier();
-    return value;
-}
-
-extern ANDROID_ATOMIC_INLINE int32_t
-android_atomic_release_load(volatile const int32_t *ptr)
-{
-    android_memory_barrier();
-    return *ptr;
-}
-
-extern ANDROID_ATOMIC_INLINE void
-android_atomic_acquire_store(int32_t value, volatile int32_t *ptr)
-{
-    *ptr = value;
-    android_memory_barrier();
-}
-
-extern ANDROID_ATOMIC_INLINE void
-android_atomic_release_store(int32_t value, volatile int32_t *ptr)
-{
-    android_memory_barrier();
-    *ptr = value;
-}
-
-extern ANDROID_ATOMIC_INLINE int
-android_atomic_cas(int32_t old_value, int32_t new_value, volatile int32_t *ptr)
-{
-    int32_t prev, status;
-    do {
-        __asm__ __volatile__ (
-            "    ll     %[prev], (%[ptr])\n"
-            "    li     %[status], 1\n"
-            "    bne    %[prev], %[old], 9f\n"
-            "    move   %[status], %[new_value]\n"
-            "    sc     %[status], (%[ptr])\n"
-            "9:\n"
-            : [prev] "=&r" (prev), [status] "=&r" (status)
-            : [ptr] "r" (ptr), [old] "r" (old_value), [new_value] "r" (new_value)
-            );
-    } while (__builtin_expect(status == 0, 0));
-    return prev != old_value;
-}
-
-extern ANDROID_ATOMIC_INLINE int
-android_atomic_acquire_cas(int32_t old_value,
-                           int32_t new_value,
-                           volatile int32_t *ptr)
-{
-    int status = android_atomic_cas(old_value, new_value, ptr);
-    android_memory_barrier();
-    return status;
-}
-
-extern ANDROID_ATOMIC_INLINE int
-android_atomic_release_cas(int32_t old_value,
-                           int32_t new_value,
-                           volatile int32_t *ptr)
-{
-    android_memory_barrier();
-    return android_atomic_cas(old_value, new_value, ptr);
-}
-
-
-extern ANDROID_ATOMIC_INLINE int32_t
-android_atomic_add(int32_t increment, volatile int32_t *ptr)
-{
-    int32_t prev, status;
-    android_memory_barrier();
-    do {
-        __asm__ __volatile__ (
-        "    ll    %[prev], (%[ptr])\n"
-        "    addu  %[status], %[prev], %[inc]\n"
-        "    sc    %[status], (%[ptr])\n"
-        :  [status] "=&r" (status), [prev] "=&r" (prev)
-        :  [ptr] "r" (ptr), [inc] "Ir" (increment)
-        );
-    } while (__builtin_expect(status == 0, 0));
-    return prev;
-}
-
-extern ANDROID_ATOMIC_INLINE int32_t
-android_atomic_inc(volatile int32_t *addr)
-{
-    return android_atomic_add(1, addr);
-}
-
-extern ANDROID_ATOMIC_INLINE int32_t
-android_atomic_dec(volatile int32_t *addr)
-{
-    return android_atomic_add(-1, addr);
-}
-
-extern ANDROID_ATOMIC_INLINE int32_t
-android_atomic_and(int32_t value, volatile int32_t *ptr)
-{
-    int32_t prev, status;
-    android_memory_barrier();
-    do {
-        __asm__ __volatile__ (
-        "    ll    %[prev], (%[ptr])\n"
-        "    and   %[status], %[prev], %[value]\n"
-        "    sc    %[status], (%[ptr])\n"
-        : [prev] "=&r" (prev), [status] "=&r" (status)
-        : [ptr] "r" (ptr), [value] "Ir" (value)
-            );
-    } while (__builtin_expect(status == 0, 0));
-    return prev;
-}
-
-extern ANDROID_ATOMIC_INLINE int32_t
-android_atomic_or(int32_t value, volatile int32_t *ptr)
-{
-    int32_t prev, status;
-    android_memory_barrier();
-    do {
-        __asm__ __volatile__ (
-        "    ll    %[prev], (%[ptr])\n"
-        "    or    %[status], %[prev], %[value]\n"
-        "    sc    %[status], (%[ptr])\n"
-        : [prev] "=&r" (prev), [status] "=&r" (status)
-        : [ptr] "r" (ptr), [value] "Ir" (value)
-            );
-    } while (__builtin_expect(status == 0, 0));
-    return prev;
-}
-
-#endif /* ANDROID_CUTILS_ATOMIC_MIPS_H */
diff --git a/include/cutils/atomic-mips64.h b/include/cutils/atomic-mips64.h
deleted file mode 100644
index 9d8f65e..0000000
--- a/include/cutils/atomic-mips64.h
+++ /dev/null
@@ -1,166 +0,0 @@
-/*
- * Copyright (C) 2010 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef ANDROID_CUTILS_ATOMIC_MIPS64_H
-#define ANDROID_CUTILS_ATOMIC_MIPS64_H
-
-#include <stdint.h>
-
-#ifndef ANDROID_ATOMIC_INLINE
-#define ANDROID_ATOMIC_INLINE inline __attribute__((always_inline))
-#endif
-
-extern ANDROID_ATOMIC_INLINE void android_compiler_barrier(void)
-{
-    __asm__ __volatile__ ("" : : : "memory");
-}
-
-extern ANDROID_ATOMIC_INLINE void android_memory_barrier(void)
-{
-    __asm__ __volatile__ ("sync" : : : "memory");
-}
-
-extern ANDROID_ATOMIC_INLINE
-int32_t android_atomic_acquire_load(volatile const int32_t *ptr)
-{
-    int32_t value = *ptr;
-    android_memory_barrier();
-    return value;
-}
-
-extern ANDROID_ATOMIC_INLINE
-int32_t android_atomic_release_load(volatile const int32_t *ptr)
-{
-    android_memory_barrier();
-    return *ptr;
-}
-
-extern ANDROID_ATOMIC_INLINE
-void android_atomic_acquire_store(int32_t value, volatile int32_t *ptr)
-{
-    *ptr = value;
-    android_memory_barrier();
-}
-
-extern ANDROID_ATOMIC_INLINE
-void android_atomic_release_store(int32_t value, volatile int32_t *ptr)
-{
-    android_memory_barrier();
-    *ptr = value;
-}
-
-extern ANDROID_ATOMIC_INLINE
-int android_atomic_cas(int32_t old_value, int32_t new_value, volatile int32_t *ptr)
-{
-    int32_t prev, status;
-    do {
-        __asm__ __volatile__ (
-            "    ll     %[prev], (%[ptr])\n"
-            "    li     %[status], 1\n"
-            "    bne    %[prev], %[old], 9f\n"
-            "    move   %[status], %[new_value]\n"
-            "    sc     %[status], (%[ptr])\n"
-            "9:\n"
-            : [prev] "=&r" (prev), [status] "=&r" (status)
-            : [ptr] "r" (ptr), [old] "r" (old_value), [new_value] "r" (new_value)
-            );
-    } while (__builtin_expect(status == 0, 0));
-    return prev != old_value;
-}
-
-extern ANDROID_ATOMIC_INLINE
-int android_atomic_acquire_cas(int32_t old_value,
-                           int32_t new_value,
-                           volatile int32_t *ptr)
-{
-    int status = android_atomic_cas(old_value, new_value, ptr);
-    android_memory_barrier();
-    return status;
-}
-
-extern ANDROID_ATOMIC_INLINE
-int android_atomic_release_cas(int32_t old_value,
-                           int32_t new_value,
-                           volatile int32_t *ptr)
-{
-    android_memory_barrier();
-    return android_atomic_cas(old_value, new_value, ptr);
-}
-
-extern ANDROID_ATOMIC_INLINE
-int32_t android_atomic_add(int32_t increment, volatile int32_t *ptr)
-{
-    int32_t prev, status;
-    android_memory_barrier();
-    do {
-        __asm__ __volatile__ (
-        "    ll    %[prev], (%[ptr])\n"
-        "    addu  %[status], %[prev], %[inc]\n"
-        "    sc    %[status], (%[ptr])\n"
-        :  [status] "=&r" (status), [prev] "=&r" (prev)
-        :  [ptr] "r" (ptr), [inc] "Ir" (increment)
-        );
-    } while (__builtin_expect(status == 0, 0));
-    return prev;
-}
-
-extern ANDROID_ATOMIC_INLINE int32_t
-android_atomic_inc(volatile int32_t *addr)
-{
-    return android_atomic_add(1, addr);
-}
-
-extern ANDROID_ATOMIC_INLINE int32_t
-android_atomic_dec(volatile int32_t *addr)
-{
-    return android_atomic_add(-1, addr);
-}
-
-extern ANDROID_ATOMIC_INLINE int32_t
-android_atomic_and(int32_t value, volatile int32_t *ptr)
-{
-    int32_t prev, status;
-    android_memory_barrier();
-    do {
-        __asm__ __volatile__ (
-        "    ll    %[prev], (%[ptr])\n"
-        "    and   %[status], %[prev], %[value]\n"
-        "    sc    %[status], (%[ptr])\n"
-        : [prev] "=&r" (prev), [status] "=&r" (status)
-        : [ptr] "r" (ptr), [value] "Ir" (value)
-            );
-    } while (__builtin_expect(status == 0, 0));
-    return prev;
-}
-
-extern ANDROID_ATOMIC_INLINE int32_t
-android_atomic_or(int32_t value, volatile int32_t *ptr)
-{
-    int32_t prev, status;
-    android_memory_barrier();
-    do {
-        __asm__ __volatile__ (
-        "    ll    %[prev], (%[ptr])\n"
-        "    or    %[status], %[prev], %[value]\n"
-        "    sc    %[status], (%[ptr])\n"
-        : [prev] "=&r" (prev), [status] "=&r" (status)
-        : [ptr] "r" (ptr), [value] "Ir" (value)
-            );
-    } while (__builtin_expect(status == 0, 0));
-    return prev;
-}
-
-#endif /* ANDROID_CUTILS_ATOMIC_MIPS_H */
diff --git a/include/cutils/atomic-x86.h b/include/cutils/atomic-x86.h
deleted file mode 100644
index 06bf1a3..0000000
--- a/include/cutils/atomic-x86.h
+++ /dev/null
@@ -1,145 +0,0 @@
-/*
- * Copyright (C) 2010 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef ANDROID_CUTILS_ATOMIC_X86_H
-#define ANDROID_CUTILS_ATOMIC_X86_H
-
-#include <stdint.h>
-
-#ifndef ANDROID_ATOMIC_INLINE
-#define ANDROID_ATOMIC_INLINE inline __attribute__((always_inline))
-#endif
-
-extern ANDROID_ATOMIC_INLINE void android_compiler_barrier(void)
-{
-    __asm__ __volatile__ ("" : : : "memory");
-}
-
-#if ANDROID_SMP == 0
-extern ANDROID_ATOMIC_INLINE void android_memory_barrier(void)
-{
-    android_compiler_barrier();
-}
-#else
-extern ANDROID_ATOMIC_INLINE void android_memory_barrier(void)
-{
-    __asm__ __volatile__ ("mfence" : : : "memory");
-}
-#endif
-
-extern ANDROID_ATOMIC_INLINE int32_t
-android_atomic_acquire_load(volatile const int32_t *ptr)
-{
-    int32_t value = *ptr;
-    android_compiler_barrier();
-    return value;
-}
-
-extern ANDROID_ATOMIC_INLINE int32_t
-android_atomic_release_load(volatile const int32_t *ptr)
-{
-    android_memory_barrier();
-    return *ptr;
-}
-
-extern ANDROID_ATOMIC_INLINE void
-android_atomic_acquire_store(int32_t value, volatile int32_t *ptr)
-{
-    *ptr = value;
-    android_memory_barrier();
-}
-
-extern ANDROID_ATOMIC_INLINE void
-android_atomic_release_store(int32_t value, volatile int32_t *ptr)
-{
-    android_compiler_barrier();
-    *ptr = value;
-}
-
-extern ANDROID_ATOMIC_INLINE int
-android_atomic_cas(int32_t old_value, int32_t new_value, volatile int32_t *ptr)
-{
-    int32_t prev;
-    __asm__ __volatile__ ("lock; cmpxchgl %1, %2"
-                          : "=a" (prev)
-                          : "q" (new_value), "m" (*ptr), "0" (old_value)
-                          : "memory");
-    return prev != old_value;
-}
-
-extern ANDROID_ATOMIC_INLINE int
-android_atomic_acquire_cas(int32_t old_value,
-                           int32_t new_value,
-                           volatile int32_t *ptr)
-{
-    /* Loads are not reordered with other loads. */
-    return android_atomic_cas(old_value, new_value, ptr);
-}
-
-extern ANDROID_ATOMIC_INLINE int
-android_atomic_release_cas(int32_t old_value,
-                           int32_t new_value,
-                           volatile int32_t *ptr)
-{
-    /* Stores are not reordered with other stores. */
-    return android_atomic_cas(old_value, new_value, ptr);
-}
-
-extern ANDROID_ATOMIC_INLINE int32_t
-android_atomic_add(int32_t increment, volatile int32_t *ptr)
-{
-    __asm__ __volatile__ ("lock; xaddl %0, %1"
-                          : "+r" (increment), "+m" (*ptr)
-                          : : "memory");
-    /* increment now holds the old value of *ptr */
-    return increment;
-}
-
-extern ANDROID_ATOMIC_INLINE int32_t
-android_atomic_inc(volatile int32_t *addr)
-{
-    return android_atomic_add(1, addr);
-}
-
-extern ANDROID_ATOMIC_INLINE int32_t
-android_atomic_dec(volatile int32_t *addr)
-{
-    return android_atomic_add(-1, addr);
-}
-
-extern ANDROID_ATOMIC_INLINE int32_t
-android_atomic_and(int32_t value, volatile int32_t *ptr)
-{
-    int32_t prev, status;
-    do {
-        prev = *ptr;
-        status = android_atomic_cas(prev, prev & value, ptr);
-    } while (__builtin_expect(status != 0, 0));
-    return prev;
-}
-
-extern ANDROID_ATOMIC_INLINE int32_t
-android_atomic_or(int32_t value, volatile int32_t *ptr)
-{
-    int32_t prev, status;
-    do {
-        prev = *ptr;
-        status = android_atomic_cas(prev, prev | value, ptr);
-    } while (__builtin_expect(status != 0, 0));
-    return prev;
-}
-
-#endif /* ANDROID_CUTILS_ATOMIC_X86_H */
diff --git a/include/cutils/atomic-x86_64.h b/include/cutils/atomic-x86_64.h
deleted file mode 100644
index 99cb070..0000000
--- a/include/cutils/atomic-x86_64.h
+++ /dev/null
@@ -1,151 +0,0 @@
-/*
- * Copyright (C) 2014 The Android Open Source Project
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *  * Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- *  * Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#ifndef ANDROID_CUTILS_ATOMIC_X86_64_H
-#define ANDROID_CUTILS_ATOMIC_X86_64_H
-
-#include <stdint.h>
-
-#ifndef ANDROID_ATOMIC_INLINE
-#define ANDROID_ATOMIC_INLINE inline __attribute__((always_inline))
-#endif
-
-extern ANDROID_ATOMIC_INLINE
-void android_compiler_barrier(void)
-{
-    __asm__ __volatile__ ("" : : : "memory");
-}
-
-extern ANDROID_ATOMIC_INLINE
-void android_memory_barrier(void)
-{
-    __asm__ __volatile__ ("mfence" : : : "memory");
-}
-
-extern ANDROID_ATOMIC_INLINE
-int32_t android_atomic_acquire_load(volatile const int32_t *ptr)
-{
-    int32_t value = *ptr;
-    android_compiler_barrier();
-    return value;
-}
-
-extern ANDROID_ATOMIC_INLINE
-int32_t android_atomic_release_load(volatile const int32_t *ptr)
-{
-    android_memory_barrier();
-    return *ptr;
-}
-
-extern ANDROID_ATOMIC_INLINE
-void android_atomic_acquire_store(int32_t value, volatile int32_t *ptr)
-{
-    *ptr = value;
-    android_memory_barrier();
-}
-
-extern ANDROID_ATOMIC_INLINE
-void android_atomic_release_store(int32_t value, volatile int32_t *ptr)
-{
-    android_compiler_barrier();
-    *ptr = value;
-}
-
-extern ANDROID_ATOMIC_INLINE
-int android_atomic_cas(int32_t old_value, int32_t new_value,
-                       volatile int32_t *ptr)
-{
-    int32_t prev;
-    __asm__ __volatile__ ("lock; cmpxchgl %1, %2"
-                          : "=a" (prev)
-                          : "q" (new_value), "m" (*ptr), "0" (old_value)
-                          : "memory");
-    return prev != old_value;
-}
-
-extern ANDROID_ATOMIC_INLINE
-int android_atomic_acquire_cas(int32_t old_value, int32_t new_value,
-                               volatile int32_t *ptr)
-{
-    /* Loads are not reordered with other loads. */
-    return android_atomic_cas(old_value, new_value, ptr);
-}
-
-extern ANDROID_ATOMIC_INLINE
-int android_atomic_release_cas(int32_t old_value, int32_t new_value,
-                               volatile int32_t *ptr)
-{
-    /* Stores are not reordered with other stores. */
-    return android_atomic_cas(old_value, new_value, ptr);
-}
-
-extern ANDROID_ATOMIC_INLINE
-int32_t android_atomic_add(int32_t increment, volatile int32_t *ptr)
-{
-    __asm__ __volatile__ ("lock; xaddl %0, %1"
-                          : "+r" (increment), "+m" (*ptr)
-                          : : "memory");
-    /* increment now holds the old value of *ptr */
-    return increment;
-}
-
-extern ANDROID_ATOMIC_INLINE
-int32_t android_atomic_inc(volatile int32_t *addr)
-{
-    return android_atomic_add(1, addr);
-}
-
-extern ANDROID_ATOMIC_INLINE
-int32_t android_atomic_dec(volatile int32_t *addr)
-{
-    return android_atomic_add(-1, addr);
-}
-
-extern ANDROID_ATOMIC_INLINE
-int32_t android_atomic_and(int32_t value, volatile int32_t *ptr)
-{
-    int32_t prev, status;
-    do {
-        prev = *ptr;
-        status = android_atomic_cas(prev, prev & value, ptr);
-    } while (__builtin_expect(status != 0, 0));
-    return prev;
-}
-
-extern ANDROID_ATOMIC_INLINE
-int32_t android_atomic_or(int32_t value, volatile int32_t *ptr)
-{
-    int32_t prev, status;
-    do {
-        prev = *ptr;
-        status = android_atomic_cas(prev, prev | value, ptr);
-    } while (__builtin_expect(status != 0, 0));
-    return prev;
-}
-
-#endif /* ANDROID_CUTILS_ATOMIC_X86_64_H */
diff --git a/include/cutils/atomic.h b/include/cutils/atomic.h
index 79409a7..ded972a 100644
--- a/include/cutils/atomic.h
+++ b/include/cutils/atomic.h
@@ -19,9 +19,10 @@
 
 #include <stdint.h>
 #include <sys/types.h>
+#include <stdatomic.h>
 
-#ifdef __cplusplus
-extern "C" {
+#ifndef ANDROID_ATOMIC_INLINE
+#define ANDROID_ATOMIC_INLINE static inline
 #endif
 
 /*
@@ -77,11 +78,41 @@ extern "C" {
  * These have the same characteristics (e.g. what happens on overflow)
  * as the equivalent non-atomic C operations.
  */
-int32_t android_atomic_inc(volatile int32_t* addr);
-int32_t android_atomic_dec(volatile int32_t* addr);
-int32_t android_atomic_add(int32_t value, volatile int32_t* addr);
-int32_t android_atomic_and(int32_t value, volatile int32_t* addr);
-int32_t android_atomic_or(int32_t value, volatile int32_t* addr);
+ANDROID_ATOMIC_INLINE
+int32_t android_atomic_inc(volatile int32_t* addr)
+{
+    volatile atomic_int_least32_t* a = (volatile atomic_int_least32_t*)addr;
+        /* Int32_t, if it exists, is the same as int_least32_t. */
+    return atomic_fetch_add_explicit(a, 1, memory_order_release);
+}
+
+ANDROID_ATOMIC_INLINE
+int32_t android_atomic_dec(volatile int32_t* addr)
+{
+    volatile atomic_int_least32_t* a = (volatile atomic_int_least32_t*)addr;
+    return atomic_fetch_sub_explicit(a, 1, memory_order_release);
+}
+
+ANDROID_ATOMIC_INLINE
+int32_t android_atomic_add(int32_t value, volatile int32_t* addr)
+{
+    volatile atomic_int_least32_t* a = (volatile atomic_int_least32_t*)addr;
+    return atomic_fetch_add_explicit(a, value, memory_order_release);
+}
+
+ANDROID_ATOMIC_INLINE
+int32_t android_atomic_and(int32_t value, volatile int32_t* addr)
+{
+    volatile atomic_int_least32_t* a = (volatile atomic_int_least32_t*)addr;
+    return atomic_fetch_and_explicit(a, value, memory_order_release);
+}
+
+ANDROID_ATOMIC_INLINE
+int32_t android_atomic_or(int32_t value, volatile int32_t* addr)
+{
+    volatile atomic_int_least32_t* a = (volatile atomic_int_least32_t*)addr;
+    return atomic_fetch_or_explicit(a, value, memory_order_release);
+}
 
 /*
  * Perform an atomic load with "acquire" or "release" ordering.
@@ -96,29 +127,53 @@ int32_t android_atomic_or(int32_t value, volatile int32_t* addr);
  * this comment, you are in the vast majority, and should not be
  * using release loads or replacing them with anything other than
  * locks or default sequentially consistent atomics.
- *
- * This is only necessary if you need the memory barrier.  A 32-bit read
- * from a 32-bit aligned address is atomic on all supported platforms.
  */
-int32_t android_atomic_acquire_load(volatile const int32_t* addr);
-int32_t android_atomic_release_load(volatile const int32_t* addr);
+ANDROID_ATOMIC_INLINE
+int32_t android_atomic_acquire_load(volatile const int32_t* addr)
+{
+    volatile atomic_int_least32_t* a = (volatile atomic_int_least32_t*)addr;
+    return atomic_load_explicit(a, memory_order_acquire);
+}
+
+ANDROID_ATOMIC_INLINE
+int32_t android_atomic_release_load(volatile const int32_t* addr)
+{
+    volatile atomic_int_least32_t* a = (volatile atomic_int_least32_t*)addr;
+    atomic_thread_fence(memory_order_seq_cst);
+    /* Any reasonable clients of this interface would probably prefer   */
+    /* something weaker.  But some remaining clients seem to be         */
+    /* abusing this API in strange ways, e.g. by using it as a fence.   */
+    /* Thus we are conservative until we can get rid of remaining       */
+    /* clients (and this function).                                     */
+    return atomic_load_explicit(a, memory_order_relaxed);
+}
 
 /*
  * Perform an atomic store with "acquire" or "release" ordering.
  *
- * Note that the notion of a "acquire" ordering for a store does not
+ * Note that the notion of an "acquire" ordering for a store does not
  * really fit into the C11 or C++11 memory model.  The extra ordering
  * is normally observable only by code using memory_order_relaxed
  * atomics, or data races.  In the rare cases in which such ordering
  * is called for, use memory_order_relaxed atomics and a trailing
  * atomic_thread_fence (typically with memory_order_release,
  * not memory_order_acquire!) instead.
- *
- * This is only necessary if you need the memory barrier.  A 32-bit write
- * to a 32-bit aligned address is atomic on all supported platforms.
  */
-void android_atomic_acquire_store(int32_t value, volatile int32_t* addr);
-void android_atomic_release_store(int32_t value, volatile int32_t* addr);
+ANDROID_ATOMIC_INLINE
+void android_atomic_acquire_store(int32_t value, volatile int32_t* addr)
+{
+    volatile atomic_int_least32_t* a = (volatile atomic_int_least32_t*)addr;
+    atomic_store_explicit(a, value, memory_order_relaxed);
+    atomic_thread_fence(memory_order_seq_cst);
+    /* Again overly conservative to accomodate weird clients.   */
+}
+
+ANDROID_ATOMIC_INLINE
+void android_atomic_release_store(int32_t value, volatile int32_t* addr)
+{
+    volatile atomic_int_least32_t* a = (volatile atomic_int_least32_t*)addr;
+    atomic_store_explicit(a, value, memory_order_release);
+}
 
 /*
  * Compare-and-set operation with "acquire" or "release" ordering.
@@ -132,10 +187,44 @@ void android_atomic_release_store(int32_t value, volatile int32_t* addr);
  * Implementations that use the release CAS in a loop may be less efficient
  * than possible, because we re-issue the memory barrier on each iteration.
  */
+ANDROID_ATOMIC_INLINE
 int android_atomic_acquire_cas(int32_t oldvalue, int32_t newvalue,
-        volatile int32_t* addr);
+                           volatile int32_t* addr)
+{
+    volatile atomic_int_least32_t* a = (volatile atomic_int_least32_t*)addr;
+    return (int)(!atomic_compare_exchange_strong_explicit(
+                                          a, &oldvalue, newvalue,
+                                          memory_order_acquire,
+                                          memory_order_acquire));
+}
+
+ANDROID_ATOMIC_INLINE
 int android_atomic_release_cas(int32_t oldvalue, int32_t newvalue,
-        volatile int32_t* addr);
+                               volatile int32_t* addr)
+{
+    volatile atomic_int_least32_t* a = (volatile atomic_int_least32_t*)addr;
+    return (int)(!atomic_compare_exchange_strong_explicit(
+                                          a, &oldvalue, newvalue,
+                                          memory_order_release,
+                                          memory_order_relaxed));
+}
+
+/*
+ * Fence primitives.
+ */
+ANDROID_ATOMIC_INLINE
+void android_compiler_barrier(void)
+{
+    __asm__ __volatile__ ("" : : : "memory");
+    /* Could probably also be:                          */
+    /* atomic_signal_fence(memory_order_seq_cst);       */
+}
+
+ANDROID_ATOMIC_INLINE
+void android_memory_barrier(void)
+{
+    atomic_thread_fence(memory_order_seq_cst);
+}
 
 /*
  * Aliases for code using an older version of this header.  These are now
@@ -145,8 +234,4 @@ int android_atomic_release_cas(int32_t oldvalue, int32_t newvalue,
 #define android_atomic_write android_atomic_release_store
 #define android_atomic_cmpxchg android_atomic_release_cas
 
-#ifdef __cplusplus
-} // extern "C"
-#endif
-
 #endif // ANDROID_CUTILS_ATOMIC_H