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131 .IX Title "Wx::Thread 3"
132 .TH Wx::Thread 3 "2007-04-29" "perl v5.8.3" "User Contributed Perl Documentation"
134 Thread \- using wxPerl with threads
136 .IX Header "SYNOPSIS"
138 \& # the order of these use()s is important
140 \& use threads::shared;
145 \& my $DONE_EVENT : shared = Wx::NewEventType;
149 \& my $worker = threads->create( \e&work );
153 \& # create frames, etc
154 \& my $frame = Wx::Frame->new( ... );
155 \& EVT_COMMAND( $frame, -1, $DONE_EVENT, \e&done );
161 \& my( $frame, $event ) = @_;
165 \& print $event->GetData;
171 \& # ... do stuff, create a shared $result value
175 \& my $threvent = new Wx::PlThreadEvent( -1, $DONE_EVENT, $result );
176 \& Wx::PostEvent( $frame, $threvent );
182 \& sub OnCreateThread {
183 \& # @_ = () is necessary to avoid "Scalars leaked"
184 \& my( $self, $event ) = @_; @_ = ();
188 \& threads->create( ... );
192 .IX Header "DESCRIPTION"
193 Threaded \s-1GUI\s0 application are somewhat different from non-GUI threaded
194 applications in that the main thread (which runs the \s-1GUI\s0) must never
195 block. Also, in wxWidgets, no thread other than the main thread can
196 manipulate \s-1GUI\s0 objects. This leads to a hybrid model where worker
197 threads must send events to the main thread in order to change the \s-1GUI\s0
198 state or signal their termination.
199 .Sh "Order of module loading"
200 .IX Subsection "Order of module loading"
201 It's necessary for \f(CW\*(C`use Wx\*(C'\fR to happen after <use threads::shared>.
202 .Sh "Sending events from worker threads"
203 .IX Subsection "Sending events from worker threads"
204 \&\f(CW\*(C`Wx::PlThreadEvent\*(C'\fR can be used to communicate between worker and
205 \&\s-1GUI\s0 threads. The event can carry a \fIshared\fR value between threads.
208 \& my $DONE_EVENT : shared = Wx::NewEventType;
213 \& # ... do some stuff
214 \& my $progress = new Wx::PlThreadEvent( -1, $DONE_EVENT, $progress );
215 \& Wx::PostEvent( $frame, $progress );
219 \& # ... do stuff, create a shared $result value
220 \& my $end = new Wx::PlThreadEvent( -1, $DONE_EVENT, $result );
221 \& Wx::PostEvent( $frame, $end );
225 The target of the event can be any \f(CW\*(C`Wx::EvtHandler\*(C'\fR
226 .Sh "Receiving events from worker threads"
227 .IX Subsection "Receiving events from worker threads"
228 \&\f(CW\*(C`Wx::PlThreadEvent\*(C'\fR is a command event and can be handled as such.
229 The \f(CW\*(C`\->GetData\*(C'\fR method can be used to retrieve the \fIshared\fR data
230 contained inside the event.
233 \& my $DONE_EVENT : shared = Wx::NewEventType;
237 \& EVT_COMMAND( $frame, -1, $DONE_EVENT, \e&done );
242 \& my( $frame, $event ) = @_;
246 \& print $event->GetData;
249 .Sh "Creating new threads"
250 .IX Subsection "Creating new threads"
251 Creating new threads from event handlers works without problems except
252 from a little snag. In order not to trigger a bug in the Perl
253 interpreter, all event handler that directly or indirectly cause a
254 thread creation must clean \f(CW@_\fR before starting the thread.
259 \& sub OnCreateThread {
260 \& my( $self, $event ) = @_; @_ = ();
264 \& threads->create( ... );
268 failure to do that will cause \*(L"scalars leaked\*(R" warnings from the Perl