do not return true when no data is read by the stream in Load(wxInputStream,wxAnimati...

[wxWidgets.git] / src / common / event.cpp

diff --git a/src/common/event.cpp b/src/common/event.cpp
index fbb9cc8f158d3d44ced335d5e861464b627a373f..3a32fb3719b469737b53c2f031a0f517820cba0d 100644 (file)
--- a/src/common/event.cpp
+++ b/src/common/event.cpp
@@ -145,11 +145,11 @@ IMPLEMENT_DYNAMIC_CLASS(wxEventTableEntryModule, wxModule)
 
 // List containing event handlers with pending events (each handler can occur
 // at most once here)
-wxList *wxPendingEvents = NULL;
+wxList *wxHandlersWithPendingEvents = NULL;
 
 #if wxUSE_THREADS
-    // protects wxPendingEvents list
-    wxCriticalSection *wxPendingEventsLocker = NULL;
+    // protects wxHandlersWithPendingEvents list
+    wxCriticalSection *wxHandlersWithPendingEventsLocker = NULL;
 #endif
 
 // common event types are defined here, other event types are defined by the
@@ -1089,25 +1089,25 @@ wxEvtHandler::~wxEvtHandler()
         m_pendingEvents->DeleteContents(true);
     delete m_pendingEvents;
 
-    // Remove us from wxPendingEvents if necessary.
-    if ( wxPendingEvents )
+    // Remove us from wxHandlersWithPendingEvents if necessary.
+    if ( wxHandlersWithPendingEvents )
     {
 #if wxUSE_THREADS
-        if (wxPendingEventsLocker)
-            wxENTER_CRIT_SECT(*wxPendingEventsLocker);
+        if (wxHandlersWithPendingEventsLocker)
+            wxENTER_CRIT_SECT(*wxHandlersWithPendingEventsLocker);
 #endif
 
-        if ( wxPendingEvents->DeleteObject(this) )
+        if ( wxHandlersWithPendingEvents->DeleteObject(this) )
         {
             // check that we were present only once in the list
-            wxASSERT_MSG( !wxPendingEvents->Find(this),
-                          "Handler occurs twice in wxPendingEvents list" );
+            wxASSERT_MSG( !wxHandlersWithPendingEvents->Find(this),
+                          "Handler occurs twice in wxHandlersWithPendingEvents list" );
         }
         //else: we weren't in this list at all, it's ok
 
 #if wxUSE_THREADS
-        if (wxPendingEventsLocker)
-            wxLEAVE_CRIT_SECT(*wxPendingEventsLocker);
+        if (wxHandlersWithPendingEventsLocker)
+            wxLEAVE_CRIT_SECT(*wxHandlersWithPendingEventsLocker);
 #endif
     }
 
@@ -1143,19 +1143,25 @@ void wxEvtHandler::QueueEvent(wxEvent *event)
 
     m_pendingEvents->Append(event);
 
-    wxLEAVE_CRIT_SECT( m_pendingEventsLock );
-
     // 2) Add this event handler to list of event handlers that
     //    have pending events.
 
-    wxENTER_CRIT_SECT(*wxPendingEventsLocker);
+    wxENTER_CRIT_SECT(*wxHandlersWithPendingEventsLocker);
 
-    if ( !wxPendingEvents )
-        wxPendingEvents = new wxList;
-    if ( !wxPendingEvents->Find(this) )
-        wxPendingEvents->Append(this);
+    if ( !wxHandlersWithPendingEvents )
+        wxHandlersWithPendingEvents = new wxList;
+    if ( !wxHandlersWithPendingEvents->Find(this) )
+        wxHandlersWithPendingEvents->Append(this);
 
-    wxLEAVE_CRIT_SECT(*wxPendingEventsLocker);
+    wxLEAVE_CRIT_SECT(*wxHandlersWithPendingEventsLocker);
+
+    // only release m_pendingEventsLock now because otherwise there is a race
+    // condition as described in the ticket #9093: we could process the event
+    // just added to m_pendingEvents in our ProcessPendingEvents() below before
+    // we had time to append this pointer to wxHandlersWithPendingEvents list; thus
+    // breaking the invariant that a handler should be in the list iff it has
+    // any pending events to process
+    wxLEAVE_CRIT_SECT( m_pendingEventsLock );
 
     // 3) Inform the system that new pending events are somewhere,
     //    and that these should be processed in idle time.
@@ -1172,7 +1178,7 @@ void wxEvtHandler::ProcessPendingEvents()
                  "should have pending events if called" );
 
     wxList::compatibility_iterator node = m_pendingEvents->GetFirst();
-    wxEventPtr event(wx_static_cast(wxEvent *, node->GetData()));
+    wxEventPtr event(static_cast<wxEvent *>(node->GetData()));
 
     // it's important we remove event from list before processing it, else a
     // nested event loop, for example from a modal dialog, might process the
@@ -1184,13 +1190,13 @@ void wxEvtHandler::ProcessPendingEvents()
     if ( m_pendingEvents->IsEmpty() )
     {
 #if wxUSE_THREADS
-        if (wxPendingEventsLocker)
-            wxENTER_CRIT_SECT(*wxPendingEventsLocker);
+        if (wxHandlersWithPendingEventsLocker)
+            wxENTER_CRIT_SECT(*wxHandlersWithPendingEventsLocker);
 #endif
-        wxPendingEvents->DeleteObject(this);
+        wxHandlersWithPendingEvents->DeleteObject(this);
 #if wxUSE_THREADS
-        if (wxPendingEventsLocker)
-            wxLEAVE_CRIT_SECT(*wxPendingEventsLocker);
+        if (wxHandlersWithPendingEventsLocker)
+            wxLEAVE_CRIT_SECT(*wxHandlersWithPendingEventsLocker);
 #endif
     }
 
@@ -1292,7 +1298,7 @@ bool wxEvtHandler::ProcessEvent(wxEvent& event)
         return true;
 
     // propagate the event upwards the window chain and/or to the application
-    // object if it wasn't processed at this level 
+    // object if it wasn't processed at this level
     return TryParent(event);
 }
 
@@ -1377,7 +1383,7 @@ bool wxEvtHandler::SearchEventTable(wxEventTable& table, wxEvent& event)
 }
 
 void wxEvtHandler::Connect( int id, int lastId,
-                            int eventType,
+                            wxEventType eventType,
                             wxObjectEventFunction func,
                             wxObject *userData,
                             wxEvtHandler* eventSink )