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diff --git a/include/__memory/shared_ptr.h b/include/__memory/shared_ptr.h
index ff8e601..828513a 100644
--- a/include/__memory/shared_ptr.h
+++ b/include/__memory/shared_ptr.h
@@ -30,7 +30,7 @@
#include <stdexcept>
#include <type_traits>
#include <typeinfo>
-#if !defined(_LIBCPP_HAS_NO_ATOMIC_HEADER)
+#if !defined(_LIBCPP_HAS_NO_THREADS) // !defined(_LIBCPP_HAS_NO_ATOMIC_HEADER)
# include <atomic>
#endif
@@ -150,7 +150,12 @@ class _LIBCPP_TYPE_VIS __shared_count
__shared_count& operator=(const __shared_count&);
protected:
- long __shared_owners_;
+#ifdef _LIBCPP_HAS_NO_THREADS
+ typedef long __atomic_count;
+#else
+ typedef atomic<long> __atomic_count;
+#endif
+ __atomic_count __shared_owners_;
virtual ~__shared_count();
private:
virtual void __on_zero_shared() _NOEXCEPT = 0;
@@ -167,11 +172,19 @@ public:
#else
_LIBCPP_INLINE_VISIBILITY
void __add_shared() _NOEXCEPT {
+#ifdef _LIBCPP_HAS_NO_THREADS
__libcpp_atomic_refcount_increment(__shared_owners_);
+#else
+ __shared_owners_++;
+#endif
}
_LIBCPP_INLINE_VISIBILITY
bool __release_shared() _NOEXCEPT {
+#ifdef _LIBCPP_HAS_NO_THREADS
if (__libcpp_atomic_refcount_decrement(__shared_owners_) == -1) {
+#else
+ if (--__shared_owners_ == -1) {
+#endif
__on_zero_shared();
return true;
}
@@ -180,14 +193,23 @@ public:
#endif
_LIBCPP_INLINE_VISIBILITY
long use_count() const _NOEXCEPT {
+#ifdef _LIBCPP_HAS_NO_THREADS
return __libcpp_relaxed_load(&__shared_owners_) + 1;
+#else
+ return __shared_owners_.load(memory_order_relaxed) + 1;
+#endif
}
};
class _LIBCPP_TYPE_VIS __shared_weak_count
: private __shared_count
{
- long __shared_weak_owners_;
+#ifdef _LIBCPP_HAS_NO_THREADS
+ typedef long __atomic_count;
+#else
+ typedef atomic<long> __atomic_count;
+#endif
+ __atomic_count __shared_weak_owners_;
public:
_LIBCPP_INLINE_VISIBILITY
@@ -210,7 +232,11 @@ public:
}
_LIBCPP_INLINE_VISIBILITY
void __add_weak() _NOEXCEPT {
+#ifdef _LIBCPP_HAS_NO_THREADS
__libcpp_atomic_refcount_increment(__shared_weak_owners_);
+#else
+ __shared_weak_owners_++;
+#endif
}
_LIBCPP_INLINE_VISIBILITY
void __release_shared() _NOEXCEPT {
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