Wrestling with the slowly dawning realization that <atomic> isn't implementable on any compiler at my disposal... git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@115054 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/atomic b/include/atomic index 9708977..be912d3 100644 --- a/include/atomic +++ b/include/atomic
@@ -2411,6 +2411,7 @@ */ #include <__config> +#include <initializer_list> #pragma GCC system_header @@ -2430,6 +2431,71 @@ return __y; } +// flag type and operations + +struct __atomic_flag_init {}; + +typedef struct atomic_flag +{ + bool __flg_; + + bool test_and_set(memory_order __o = memory_order_seq_cst) volatile + { + switch (__o) + { + case memory_order_relaxed: + case memory_order_consume: + case memory_order_acquire: + return __sync_lock_test_and_set(&__flg_, true); + case memory_order_release: + case memory_order_acq_rel: + case memory_order_seq_cst: + bool __r = __sync_lock_test_and_set(&__flg_, true); + __sync_synchronize(); + return __r; + } + } + + bool test_and_set(memory_order __o = memory_order_seq_cst) + {return const_cast<volatile atomic_flag*>(this)->test_and_set(__o);} + void clear(memory_order = memory_order_seq_cst) volatile; + void clear(memory_order = memory_order_seq_cst); + +#ifndef _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS + atomic_flag() = default; +#else + atomic_flag() {}; +#endif + +#if 0 + +#ifndef _LIBCPP_HAS_NO_DELETED_FUNCTIONS + atomic_flag(const atomic_flag&) = delete; + atomic_flag& operator=(const atomic_flag&) = delete; + atomic_flag& operator=(const atomic_flag&) volatile = delete; +#else +private: + atomic_flag(const atomic_flag&); + atomic_flag& operator=(const atomic_flag&); + atomic_flag& operator=(const atomic_flag&) volatile; +public: +#endif +#else + atomic_flag(__atomic_flag_init) : __flg_(false) {} // temporary +#endif +} atomic_flag; + +bool atomic_flag_test_and_set(volatile atomic_flag*); +bool atomic_flag_test_and_set(atomic_flag*); +bool atomic_flag_test_and_set_explicit(volatile atomic_flag*, memory_order); +bool atomic_flag_test_and_set_explicit(atomic_flag*, memory_order); +void atomic_flag_clear(volatile atomic_flag*); +void atomic_flag_clear(atomic_flag*); +void atomic_flag_clear_explicit(volatile atomic_flag*, memory_order); +void atomic_flag_clear_explicit(atomic_flag*, memory_order); + +#define ATOMIC_FLAG_INIT _STD::__atomic_flag_init() + _LIBCPP_END_NAMESPACE_STD #endif // _LIBCPP_ATOMIC 