mention that wxPostEvent() only works for sending messages to the main thread

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@28116 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

diff --git a/docs/latex/wx/tthreads.tex b/docs/latex/wx/tthreads.tex
index b6162f24ee6c94619d5099abc19c2fd35426f397..c06ddbc3c480cbfc0a36c6d22f06257c53575c7a 100644 (file)
--- a/docs/latex/wx/tthreads.tex
+++ b/docs/latex/wx/tthreads.tex
@@ -24,8 +24,9 @@ new thread for each new client), but in others it might be a very poor choice
 (example: launching a separate thread when doing a long computation to show a
 progress dialog). Other implementation choices are available: for the progress
 dialog example it is far better to do the calculations in the 
 (example: launching a separate thread when doing a long computation to show a
 progress dialog). Other implementation choices are available: for the progress
 dialog example it is far better to do the calculations in the 

-\helpref{idle handler}{wxidleevent} or call \helpref{wxYield()}{wxyield} 
-periodically to update the screen.
+\helpref{idle handler}{wxidleevent} or even simply do everything at once
+but call \helpref{wxWindow::Update()}{wxwindowupdate} periodically to update
+the screen.

 
 If you do decide to use threads in your application, it is strongly recommended
 that no more than one thread calls GUI functions. The thread sample shows that
 
 If you do decide to use threads in your application, it is strongly recommended
 that no more than one thread calls GUI functions. The thread sample shows that


@@ -37,10 +38,16 @@ more robust and will undoubtedly save you countless problems (example: under
 Win32 a thread can only access GDI objects such as pens, brushes, \&c created by
 itself and not by the other threads).
 
 Win32 a thread can only access GDI objects such as pens, brushes, \&c created by
 itself and not by the other threads).
 

-For communication between threads, use 
+For communication between secondar threads and the main thread, use may use 

 \helpref{wxEvtHandler::AddPendingEvent}{wxevthandleraddpendingevent}
 or its short version \helpref{wxPostEvent}{wxpostevent}. These functions
 have thread safe implementation so that they can be used as they are for
 \helpref{wxEvtHandler::AddPendingEvent}{wxevthandleraddpendingevent}
 or its short version \helpref{wxPostEvent}{wxpostevent}. These functions
 have thread safe implementation so that they can be used as they are for

-sending event from one thread to another.
+sending event from one thread to another. However there is no built in method
+to send messages to the worker threads and you will need to use the available
+synchronization classes to implement the solution which suits your needs
+yourself. In particular, please notice that it is \emph{not} enough to derive
+your class from \helpref{wxThread}{wxthread} and 
+\helpref{wxEvtHandler}{wxevthandler} to send messages to it: in fact, this does
+\emph{not} work at all.