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Fix a race in the construction of future. This fixes http://llvm.org/bugs/show_bug.cgi?id=14934. 

llvm-svn: 172456
This commit is contained in:
Howard Hinnant 2013-01-14 20:01:24 +00:00
parent 49e022df8f
commit 2153d69672
2 changed files with 6 additions and 2 deletions
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6
libcxx/include/future
View File

@ -470,7 +470,11 @@ public:
{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;}

2
libcxx/src/future.cpp
View File

@ -78,8 +78,8 @@ __assoc_sub_state::set_value()
throw future_error(make_error_code(future_errc::promise_already_satisfied));
#endif
__state_ |= __constructed | ready;
__lk.unlock();
__cv_.notify_all();
__lk.unlock();
}
void