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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@52071 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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docs/doxygen/overviews/thread.h
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///////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////
// Name: thread // Name: thread.h
// Purpose: topic overview // Purpose: topic overview
// Author: wxWidgets team // Author: wxWidgets team
// RCS-ID: $Id$ // RCS-ID: $Id$
@ -10,18 +10,14 @@
@page overview_thread Multithreading overview @page overview_thread Multithreading overview
Classes: #wxThread, #wxMutex, Classes: #wxThread, #wxMutex, #wxCriticalSection, #wxCondition
#wxCriticalSection,
#wxCondition
wxWidgets provides a complete set of classes encapsulating objects necessary in wxWidgets provides a complete set of classes encapsulating objects necessary in
multithreaded (MT) programs: the #thread class itself and different multithreaded (MT) programs: the wxThread class itself and different
synchronization objects: #mutexes and synchronization objects: mutexes (see wxMutex) and critical sections (see
@ref criticalsection_overview with wxCriticalSection) with conditions (see wxCondition). The thread API in wxWidgets
#conditions. The thread API in wxWidgets resembles to resembles to POSIX1.c threads API (a.k.a. pthreads), although several functions have
POSIX1.c threads API (a.k.a. pthreads), although several functions have different names and some features inspired by Win32 thread API are there as well.
different names and some features inspired by Win32 thread API are there as
well.
These classes will hopefully make writing MT programs easier and they also These classes will hopefully make writing MT programs easier and they also
provide some extra error checking (compared to the native (be it Win32 or Posix) provide some extra error checking (compared to the native (be it Win32 or Posix)
@ -33,10 +29,9 @@
new thread for each new client), but in others it might be a very poor choice 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 (example: launching a separate thread when doing a long computation to show a
progress dialog). Other implementation choices are available: for the progress progress dialog). Other implementation choices are available: for the progress
dialog example it is far better to do the calculations in the dialog example it is far better to do the calculations in the idle handler
@ref idleevent_overview or even simply do everything at once (see @ref wxIdleEvent) or even simply do everything at once but call wxWindow::Update()
but call wxWindow::Update() periodically to update periodically to update the screen.
the screen.
If you do decide to use threads in your application, it is strongly recommended 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 that no more than one thread calls GUI functions. The thread sample shows that
@ -49,17 +44,14 @@
itself and not by the other threads). itself and not by the other threads).
For communication between secondary threads and the main thread, you may use For communication between secondary threads and the main thread, you may use
wxEvtHandler::AddPendingEvent wxEvtHandler::AddPendingEvent or its short version #wxPostEvent. These functions
or its short version #wxPostEvent. These functions
have a thread-safe implementation so that they can be used as they are for have a thread-safe implementation so that they can be used as they are for
sending events from one thread to another. However there is no built in method sending events 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 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 synchronization classes to implement the solution which suits your needs
yourself. In particular, please note that it is not enough to derive yourself. In particular, please note that it is not enough to derive
your class from #wxThread and your class from #wxThread and #wxEvtHandler to send messages to it:
#wxEvtHandler to send messages to it: in fact, this does in fact, this does not work at all.
not work at all.
*/
*/