Repair thread-unsafe modifications of n_alive in F.pass.cpp
In this example, the ctor of G runs in the main thread in the expression G(), and also in the copy ctor of G() in the DECAY_COPY inside std::thread. The main thread destroys the G() instance at the semicolon, and the started thread destroys the G() after it returns. Thus there is a race between the threads on the n_alive variable.
The fix is to join with the background thread before attempting to destroy the G in the main thread.
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@344820 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed
