tree 24b115e0526150453f6743d497a0c95f2e012d87
parent 6c34a15a1f44fca2fe37dbe6799b53154f0ed41b
author Billy Robert O'Neal III <bion@microsoft.com> 1539992745 +0000
committer Billy Robert O'Neal III <bion@microsoft.com> 1539992745 +0000

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