enable atomic operations in std::shared_ptr

Author: Costy Blokh

sdk/tlibcxx/include/memory

@@ -701,7 +701,7 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 template <class _ValueType>
 inline _LIBCPP_INLINE_VISIBILITY
 _ValueType __libcpp_relaxed_load(_ValueType const* __value) {
-#if !defined(_LIBCPP_HAS_NO_THREADS) && \
+#if defined(_LIBCPP_SGX_HAS_CXX_ATOMIC) && \
     defined(__ATOMIC_RELAXED) &&        \
     (__has_builtin(__atomic_load_n) || defined(_LIBCPP_COMPILER_GCC))
     return __atomic_load_n(__value, __ATOMIC_RELAXED);
@@ -713,7 +713,7 @@ _ValueType __libcpp_relaxed_load(_ValueType const* __value) {
 template <class _ValueType>
 inline _LIBCPP_INLINE_VISIBILITY
 _ValueType __libcpp_acquire_load(_ValueType const* __value) {
-#if !defined(_LIBCPP_HAS_NO_THREADS) && \
+#if defined(_LIBCPP_SGX_HAS_CXX_ATOMIC) && \
     defined(__ATOMIC_ACQUIRE) &&        \
     (__has_builtin(__atomic_load_n) || defined(_LIBCPP_COMPILER_GCC))
     return __atomic_load_n(__value, __ATOMIC_ACQUIRE);
@@ -2452,7 +2452,7 @@ template <class _Tp>
 inline _LIBCPP_INLINE_VISIBILITY _Tp
 __libcpp_atomic_refcount_increment(_Tp& __t) _NOEXCEPT
 {
-#if defined(_LIBCPP_HAS_BUILTIN_ATOMIC_SUPPORT) && !defined(_LIBCPP_HAS_NO_THREADS)
+#if defined(_LIBCPP_SGX_HAS_CXX_ATOMIC)
     return __atomic_add_fetch(&__t, 1, __ATOMIC_RELAXED);
 #else
     return __t += 1;
@@ -2463,7 +2463,7 @@ template <class _Tp>
 inline _LIBCPP_INLINE_VISIBILITY _Tp
 __libcpp_atomic_refcount_decrement(_Tp& __t) _NOEXCEPT
 {
-#if defined(_LIBCPP_HAS_BUILTIN_ATOMIC_SUPPORT) && !defined(_LIBCPP_HAS_NO_THREADS)
+#if defined(_LIBCPP_SGX_HAS_CXX_ATOMIC)
     return __atomic_add_fetch(&__t, -1, __ATOMIC_ACQ_REL);
 #else
     return __t -= 1;

sdk/tlibcxx/src/include/atomic_support.h

@@ -40,7 +40,7 @@ _LIBCPP_BEGIN_NAMESPACE_STD
 
 namespace {
 
-#if defined(_LIBCPP_HAS_ATOMIC_BUILTINS) && !defined(_LIBCPP_HAS_NO_THREADS)
+#if defined(_LIBCPP_HAS_ATOMIC_BUILTINS) && defined(_LIBCPP_SGX_HAS_CXX_ATOMIC)
 
 enum __libcpp_atomic_order {
     _AO_Relaxed = __ATOMIC_RELAXED,