#3591 rethrow should be mac specific

Jumped the gun a bit, since reportCrashToBugsplat is OS specific,
restore rethrow for other systems.

indra/llcommon/llcoros.cpp

@@ -228,6 +228,22 @@ std::string LLCoros::logname()
     return data.mName.empty()? data.getKey() : data.mName;
 }
 
+void LLCoros::saveException(const std::string& name, std::exception_ptr exc)
+{
+    mExceptionQueue.emplace(name, exc);
+}
+
+void LLCoros::rethrow()
+{
+    if (! mExceptionQueue.empty())
+    {
+        ExceptionData front = mExceptionQueue.front();
+        mExceptionQueue.pop();
+        LL_WARNS("LLCoros") << "Rethrowing exception from coroutine " << front.name << LL_ENDL;
+        std::rethrow_exception(front.exception);
+    }
+}
+
 void LLCoros::setStackSize(S32 stacksize)
 {
     LL_DEBUGS("LLCoros") << "Setting coroutine stack size to " << stacksize << LL_ENDL;
@@ -370,7 +386,16 @@ void LLCoros::toplevel(std::string name, callable_t callable)
         // viewer will carry on.
         LOG_UNHANDLED_EXCEPTION(STRINGIZE("coroutine " << name));
     }
-    // uncaught exception by default will cause std::terminate()
+#ifndef LL_WINDOWS
+    catch (...)
+    {
+        // Stash any OTHER kind of uncaught exception in the rethrow() queue
+        // to be rethrown by the main fiber.
+        LL_WARNS("LLCoros") << "Capturing uncaught exception in coroutine "
+                            << name << LL_ENDL;
+        LLCoros::instance().saveException(name, std::current_exception());
+    }
+#endif // ! LL_WINDOWS
 }
 
 //static

indra/llcommon/llcoros.h

@@ -170,6 +170,19 @@ public:
      */
     static std::string getName();
 
+    /**
+     * rethrow() is called by the thread's main fiber to propagate an
+     * exception from any coroutine into the main fiber, where it can engage
+     * the normal unhandled-exception machinery, up to and including crash
+     * reporting.
+     *
+     * LLCoros maintains a queue of otherwise-uncaught exceptions from
+     * terminated coroutines. Each call to rethrow() pops the first of those
+     * and rethrows it. When the queue is empty (normal case), rethrow() is a
+     * no-op.
+     */
+    void rethrow();
+
     /**
      * This variation returns a name suitable for log messages: the explicit
      * name for an explicitly-launched coroutine, or "mainN" for the default
@@ -314,6 +327,20 @@ private:
     void toplevel(std::string name, callable_t callable);
     struct CoroData;
     static CoroData& get_CoroData(const std::string& caller);
+    void saveException(const std::string& name, std::exception_ptr exc);
+
+    struct ExceptionData
+    {
+        ExceptionData(const std::string& nm, std::exception_ptr exc):
+            name(nm),
+            exception(exc)
+        {}
+        // name of coroutine that originally threw this exception
+        std::string name;
+        // the thrown exception
+        std::exception_ptr exception;
+    };
+    std::queue<ExceptionData> mExceptionQueue;
 
     S32 mStackSize;
 

indra/newview/llappviewer.cpp

@@ -1402,6 +1402,8 @@ bool LLAppViewer::doFrame()
                 LL_PROFILE_ZONE_NAMED_CATEGORY_APP("df suspend");
                 // give listeners a chance to run
                 llcoro::suspend();
+                // if one of our coroutines threw an uncaught exception, rethrow it now
+                LLCoros::instance().rethrow();
             }
         }