Change the control flow in atomic_compare_exchange_strong to avoid a potential deadlock.

When you assign a shared_ptr, the deleter gets called and assigned. In this routine, the assignment happens inside a critical section, which could (potentially) lead to a deadlock, if the deleter did something wonky. Now we swap the old value with an (empty) temporary shared_ptr, and then let the temporary delete the old value when it goes out of scope (after the lock has been released).  This should fix PR#27724. Thanks to Hans Boehm for the bug report and the suggested fix.

git-svn-id: 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed