Admin: shutdown cleanly to avoid races during close.

Suspect cause for SEGV in:

std::_Rb_tree<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::shared_ptr<DocumentBroker> >, std::_Select1st<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::shared_ptr<DocumentBroker> > >, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::shared_ptr<DocumentBroker> > > >::find(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)
COOLWSD::closeDocument(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)
Admin::triggerMemoryCleanup(unsigned long)
Admin::pollingThread()

Change-Id: Id09e4db4b21cb7a11dddb867758aded4b28ff3ec
Signed-off-by: Michael Meeks <michael.meeks@collabora.com>

3 files changed, 9 insertions, 0 deletions

diff --git a/wsd/Admin.cpp b/wsd/Admin.cpp
index 1a78bf25dc..ba75f81d7f 100644
--- a/wsd/Admin.cpp
+++ b/wsd/Admin.cpp
@@ -958,4 +958,9 @@ void Admin::start()
     startThread();
 }
 
+void Admin::stop()
+{
+    joinThread();
+}
+
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/wsd/Admin.hpp b/wsd/Admin.hpp
index 01f531337b..dc8059fbf0 100644
--- a/wsd/Admin.hpp
+++ b/wsd/Admin.hpp
@@ -67,6 +67,7 @@ public:
     }
 
     void start();
+    void stop();
 
     /// Custom poll thread function
     void pollingThread() override;
diff --git a/wsd/LOOLWSD.cpp b/wsd/LOOLWSD.cpp
index 6a4ceeaff4..0fdf94334d 100644
--- a/wsd/LOOLWSD.cpp
+++ b/wsd/LOOLWSD.cpp
@@ -3922,6 +3922,9 @@ public:
     {
         _acceptPoll.joinThread();
         WebServerPoll.joinThread();
+#if !MOBILEAPP
+        Admin::instance().stop();
+#endif
     }
 
     void dumpState(std::ostream& os)