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Prevent dependancy on libatomic when using GCC to provide <atomic>.

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The __atomic_is_lock_free(...) function sometimes requires linkage to libatomic
if it cannot be evaluated at compile time. Remove __c11_atomic_is_lock_free
and use __atomic_is_lock_free(sizeof(Tp)) directly so that it can be evaluated
at compile time.


git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@239648 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Fiselier 2015-06-13 00:23:07 +00:00
parent 56a599b976
commit 7726a348df
1 changed files with 8 additions and 6 deletions
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14
include/atomic
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@ -633,10 +633,6 @@ static inline void __c11_atomic_signal_fence(memory_order __order) {
__atomic_signal_fence(__gcc_atomic::__to_gcc_order(__order));
}
static inline bool __c11_atomic_is_lock_free(size_t __size) {
return __atomic_is_lock_free(__size, 0);
}
template <typename _Tp>
static inline void __c11_atomic_store(volatile _Atomic(_Tp)* __a, _Tp __val,
memory_order __order) {
@ -827,10 +823,16 @@ struct __atomic_base // false
_LIBCPP_INLINE_VISIBILITY
bool is_lock_free() const volatile _NOEXCEPT
{return __c11_atomic_is_lock_free(sizeof(_Tp));}
{
#if __has_feature(cxx_atomic)
return __c11_atomic_is_lock_free(sizeof(_Tp));
#else
return __atomic_is_lock_free(sizeof(_Tp), 0);
#endif
}
_LIBCPP_INLINE_VISIBILITY
bool is_lock_free() const _NOEXCEPT
{return __c11_atomic_is_lock_free(sizeof(_Tp));}
{return static_cast<__atomic_base const volatile*>(this)->is_lock_free();}
_LIBCPP_INLINE_VISIBILITY
void store(_Tp __d, memory_order __m = memory_order_seq_cst) volatile _NOEXCEPT
{__c11_atomic_store(&__a_, __d, __m);}