Greg Clayton 4329fe4271 Don't let two threads call Debugger::Clear simultaneously. ...

We don't want a mutex in debugger as it will cause A/B locking issues with the lldb_private::Target's mutex, but we do need to stop two threads from doing Debugger::Clear at the same time. We have seen issues with this with the C++ global destructor chain where the global debugger list is being destroyed and the Debugger::~Debugger() is calling it while another thread was in the middle of running that function.

<rdar://problem/26098913>

llvm-svn: 268563

2016-05-04 22:26:42 +00:00

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