SL-18721 Shutdown fixes

1. After window closes viewer still takes some time to shut down, so
added splash screen to not confuse users (and to see if something gets
stuck)
2. Having two identical mWindowHandle caused confusion for me, so I
split them. It looks like there might have been issues with thread being
stuck because thread's handle wasn't cleaned up.
3. Made region clean mCacheMap immediately instead of spending time
making copies on shutdown

1 files changed, 14 insertions, 3 deletions

diff --git a/indra/llcommon/threadpool.cpp b/indra/llcommon/threadpool.cpp
index 3a9a5a2062..a063a01b82 100644
--- a/indra/llcommon/threadpool.cpp
+++ b/indra/llcommon/threadpool.cpp
@@ -60,12 +60,15 @@ struct sleepy_robin: public boost::fibers::algo::round_robin
 /*****************************************************************************
 *   ThreadPoolBase
 *****************************************************************************/
-LL::ThreadPoolBase::ThreadPoolBase(const std::string& name, size_t threads,
-                                   WorkQueueBase* queue):
+LL::ThreadPoolBase::ThreadPoolBase(const std::string& name,
+                                   size_t threads,
+                                   WorkQueueBase* queue,
+                                   bool auto_shutdown):
     super(name),
     mName("ThreadPool:" + name),
     mThreadCount(getConfiguredWidth(name, threads)),
-    mQueue(queue)
+    mQueue(queue),
+    mAutomaticShutdown(auto_shutdown)
 {}
 
 void LL::ThreadPoolBase::start()
@@ -79,6 +82,14 @@ void LL::ThreadPoolBase::start()
                 run(tname);
             });
     }
+
+    if (!mAutomaticShutdown)
+    {
+        // Some threads, like main window's might need to run a bit longer
+        // to wait for a proper shutdown message
+        return;
+    }
+
     // Listen on "LLApp", and when the app is shutting down, close the queue
     // and join the workers.
     LLEventPumps::instance().obtain("LLApp").listen(