[lldb/test] Fix TestProgressReporting.py race issue with the event listener

This patch is a follow-up of D120100 to address some feedbacks from
@labath.

This should mainly fix the race issue with the even listener by moving
the listener setup to the main thread.

This also changes the SBDebugger::GetProgressFromEvent SWIG binding
arguments to be output only, so the user don't have to provide them.

Finally, this updates the test to check it the out arguments are returned
in a tuple and re-enables the test on all platforms.

Differential Revision: https://reviews.llvm.org/D120284

Signed-off-by: Med Ismail Bennani <[email protected]>

Author: medismailben

lldb/bindings/interface/SBDebugger.i

@@ -123,14 +123,11 @@ public:
     };
 
 
-    %apply uint64_t& INOUT { uint64_t& progress_id };
-    %apply uint64_t& INOUT { uint64_t& completed };
-    %apply uint64_t& INOUT { uint64_t& total };
-    %apply bool& INOUT { bool& is_debugger_specific };
     static const char *GetProgressFromEvent(const lldb::SBEvent &event,
-                                        uint64_t &progress_id,
-                                        uint64_t &completed, uint64_t &total,
-                                        bool &is_debugger_specific);
+                                        uint64_t &OUTPUT,
+                                        uint64_t &OUTPUT,
+                                        uint64_t &OUTPUT,
+                                        bool &OUTPUT);
 
     SBBroadcaster GetBroadcaster();
 

lldb/test/API/functionalities/progress_reporting/TestProgressReporting.py

@@ -17,41 +17,42 @@ def setUp(self):
         TestBase.setUp(self)
         self.progress_events = []
 
-    def fetch_events(self, test_broadcaster):
-        listener = lldb.SBListener("lldb.progress.listener")
-        listener.StartListeningForEvents(test_broadcaster,
-                                         self.eBroadcastBitStopProgressThread)
-
-        progress_broadcaster = self.dbg.GetBroadcaster()
-        progress_broadcaster.AddListener(listener, lldb.SBDebugger.eBroadcastBitProgress)
-
+    def fetch_events(self):
         event = lldb.SBEvent()
 
         done = False
         while not done:
-            if listener.WaitForEvent(1, event):
+            if self.listener.WaitForEvent(1, event):
                 event_mask = event.GetType();
-                if event.BroadcasterMatchesRef(test_broadcaster):
+                if event.BroadcasterMatchesRef(self.test_broadcaster):
                     if event_mask & self.eBroadcastBitStopProgressThread:
                         done = True;
-                elif event.BroadcasterMatchesRef(progress_broadcaster):
-                    message = lldb.SBDebugger().GetProgressFromEvent(event, 0, 0, 0, False);
+                elif event.BroadcasterMatchesRef(self.progress_broadcaster):
+                    ret_args = lldb.SBDebugger().GetProgressFromEvent(event);
+                    self.assertGreater(len(ret_args), 1)
+
+                    message = ret_args[0]
                     if message:
                         self.progress_events.append((message, event))
 
-    @skipUnlessDarwin
     def test_dwarf_symbol_loading_progress_report(self):
         """Test that we are able to fetch dwarf symbol loading progress events"""
         self.build()
 
-        test_broadcaster = lldb.SBBroadcaster('lldb.broadcaster.test')
-        listener_thread = threading.Thread(target=self.fetch_events,
-                                           args=[test_broadcaster])
+        self.listener = lldb.SBListener("lldb.progress.listener")
+        self.test_broadcaster = lldb.SBBroadcaster('lldb.broadcaster.test')
+        self.listener.StartListeningForEvents(self.test_broadcaster,
+                                              self.eBroadcastBitStopProgressThread)
+
+        self.progress_broadcaster = self.dbg.GetBroadcaster()
+        self.progress_broadcaster.AddListener(self.listener, lldb.SBDebugger.eBroadcastBitProgress)
+
+        listener_thread = threading.Thread(target=self.fetch_events)
         listener_thread.start()
 
         lldbutil.run_to_source_breakpoint(self, 'break here', lldb.SBFileSpec('main.c'))
 
-        test_broadcaster.BroadcastEventByType(self.eBroadcastBitStopProgressThread)
+        self.test_broadcaster.BroadcastEventByType(self.eBroadcastBitStopProgressThread)
         listener_thread.join()
 
-        self.assertTrue(len(self.progress_events) > 0)
+        self.assertGreater(len(self.progress_events), 0)