Fix a race in the construction of future. This fixes http://llvm.org/bugs/show_bug.cgi?id=14934.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@172456 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/future b/include/future
index cf552a9..f4e6fec 100644
--- a/include/future
+++ b/include/future
@@ -470,7 +470,11 @@
{return (__state_ & __constructed) || (__exception_ != nullptr);}
_LIBCPP_INLINE_VISIBILITY
- void __set_future_attached() {__state_ |= __future_attached;}
+ void __set_future_attached()
+ {
+ lock_guard<mutex> __lk(__mut_);
+ __state_ |= __future_attached;
+ }
_LIBCPP_INLINE_VISIBILITY
bool __has_future_attached() const {return __state_ & __future_attached;}