Tim Northover 0614fcd0e3 Prevent race in when stopping a "read thread" ...

Both StopReadThread and the thread being stopped set the thread id to
0 after m_read_thread_enabled was set to false. If the thread being
stopped got there first then StopReadThread called pthread_join on an
invalid thread number. This is not a Good Thing,

Should fix a fairly regular segfault when quitting on Linux.

llvm-svn: 185107

2013-06-27 21:19:30 +00:00

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