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no real change; just reorder the sample putting all declarations together and all implementations together; move frame construction code in MyFrame ctor; add some comment about TEST_YIELD_RACE_CONDITIONsymbol

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@59052 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Francesco Montorsi
2009-02-20 11:56:43 +00:00
parent 3c99e2fd1b
commit 3186fa9107
1 changed files with 194 additions and 153 deletions
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347
samples/thread/thread.cpp
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@@ -9,6 +9,14 @@
// Licence: wxWindows license // Licence: wxWindows license
///////////////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////////////
// ============================================================================
// declarations
// ============================================================================
// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------
// For compilers that support precompilation, includes "wx/wx.h". // For compilers that support precompilation, includes "wx/wx.h".
#include "wx/wxprec.h" #include "wx/wxprec.h"
@@ -27,11 +35,18 @@
#include "wx/thread.h" #include "wx/thread.h"
#include "wx/dynarray.h" #include "wx/dynarray.h"
#include "wx/numdlg.h" #include "wx/numdlg.h"
#include "wx/progdlg.h" #include "wx/progdlg.h"
// ----------------------------------------------------------------------------
// resources
// ----------------------------------------------------------------------------
#include "../sample.xpm" #include "../sample.xpm"
// ----------------------------------------------------------------------------
// private classes
// ----------------------------------------------------------------------------
// define this to use wxExecute in the exec tests, otherwise just use system // define this to use wxExecute in the exec tests, otherwise just use system
#define USE_EXECUTE #define USE_EXECUTE
@@ -67,9 +82,6 @@ public:
bool m_shuttingDown; bool m_shuttingDown;
}; };
// Create a new application object
IMPLEMENT_APP(MyApp)
// Define a new frame type // Define a new frame type
class MyFrame: public wxFrame class MyFrame: public wxFrame
{ {
@@ -150,6 +162,10 @@ private:
DECLARE_EVENT_TABLE() DECLARE_EVENT_TABLE()
}; };
// ----------------------------------------------------------------------------
// constants
// ----------------------------------------------------------------------------
// ID for the menu commands // ID for the menu commands
enum enum
{ {
@@ -196,70 +212,6 @@ public:
MyFrame *m_frame; MyFrame *m_frame;
}; };
MyThread::MyThread(MyFrame *frame)
: wxThread()
{
m_count = 0;
m_frame = frame;
}
MyThread::~MyThread()
{
wxCriticalSectionLocker locker(wxGetApp().m_critsect);
wxArrayThread& threads = wxGetApp().m_threads;
threads.Remove(this);
if ( threads.IsEmpty() )
{
// signal the main thread that there are no more threads left if it is
// waiting for us
if ( wxGetApp().m_shuttingDown )
{
wxGetApp().m_shuttingDown = false;
wxGetApp().m_semAllDone.Post();
}
}
}
void *MyThread::Entry()
{
wxString text;
text.Printf(wxT("Thread 0x%lx started (priority = %u).\n"),
GetId(), GetPriority());
WriteText(text);
// wxLogMessage(text); -- test wxLog thread safeness
for ( m_count = 0; m_count < 10; m_count++ )
{
// check if the application is shutting down: in this case all threads
// should stop a.s.a.p.
{
wxCriticalSectionLocker locker(wxGetApp().m_critsect);
if ( wxGetApp().m_shuttingDown )
return NULL;
}
// check if just this thread was asked to exit
if ( TestDestroy() )
break;
text.Printf(wxT("[%u] Thread 0x%lx here.\n"), m_count, GetId());
WriteText(text);
// wxSleep() can't be called from non-GUI thread!
wxThread::Sleep(1000);
}
text.Printf(wxT("Thread 0x%lx finished.\n"), GetId());
WriteText(text);
// wxLogMessage(text); -- test wxLog thread safeness
return NULL;
}
// ---------------------------------------------------------------------------- // ----------------------------------------------------------------------------
// worker thread // worker thread
// ---------------------------------------------------------------------------- // ----------------------------------------------------------------------------
@@ -281,57 +233,6 @@ public:
unsigned m_count; unsigned m_count;
}; };
MyWorkerThread::MyWorkerThread(MyFrame *frame)
: wxThread()
{
m_frame = frame;
m_count = 0;
}
void MyWorkerThread::OnExit()
{
}
#define TEST_YIELD_RACE_CONDITION 0
void *MyWorkerThread::Entry()
{
#if TEST_YIELD_RACE_CONDITION
if ( TestDestroy() )
return NULL;
wxThreadEvent event( wxEVT_COMMAND_THREAD, WORKER_EVENT );
event.SetInt( 50 );
wxQueueEvent( m_frame, new wxThreadEvent(event) );
event.SetInt(-1);
wxQueueEvent( m_frame, new wxThreadEvent(event) );
#else
for ( m_count = 0; !m_frame->Cancelled() && (m_count < 100); m_count++ )
{
// check if we were asked to exit
if ( TestDestroy() )
break;
// create any type of command event here
wxThreadEvent event( wxEVT_COMMAND_THREAD, WORKER_EVENT );
event.SetInt( m_count );
// send in a thread-safe way
wxQueueEvent( m_frame, new wxThreadEvent(event) );
wxMilliSleep(200);
}
wxThreadEvent event( wxEVT_COMMAND_THREAD, WORKER_EVENT );
event.SetInt(-1); // that's all
wxQueueEvent( m_frame, new wxThreadEvent(event) );
#endif
return NULL;
}
// ---------------------------------------------------------------------------- // ----------------------------------------------------------------------------
// a thread which simply calls wxExecute // a thread which simply calls wxExecute
// ---------------------------------------------------------------------------- // ----------------------------------------------------------------------------
@@ -354,8 +255,45 @@ private:
wxString m_command; wxString m_command;
}; };
// ---------------------------------------------------------------------------- // ============================================================================
// implementation // implementation
// ============================================================================
// ----------------------------------------------------------------------------
// the application class
// ----------------------------------------------------------------------------
// Create a new application object
IMPLEMENT_APP(MyApp)
MyApp::MyApp()
{
m_shuttingDown = false;
}
// `Main program' equivalent, creating windows and returning main app frame
bool MyApp::OnInit()
{
if ( !wxApp::OnInit() )
return false;
// uncomment this to get some debugging messages from the trace code
// on the console (or just set WXTRACE env variable to include "thread")
//wxLog::AddTraceMask("thread");
// Create the main frame window
MyFrame *frame = new MyFrame((wxFrame *)NULL, _T("wxWidgets threads sample"),
50, 50, 450, 340);
SetTopWindow(frame);
// Show the frame
frame->Show(true);
return true;
}
// ----------------------------------------------------------------------------
// MyFrame
// ---------------------------------------------------------------------------- // ----------------------------------------------------------------------------
BEGIN_EVENT_TABLE(MyFrame, wxFrame) BEGIN_EVENT_TABLE(MyFrame, wxFrame)
@@ -381,24 +319,12 @@ BEGIN_EVENT_TABLE(MyFrame, wxFrame)
EVT_IDLE(MyFrame::OnIdle) EVT_IDLE(MyFrame::OnIdle)
END_EVENT_TABLE() END_EVENT_TABLE()
MyApp::MyApp() // My frame constructor
MyFrame::MyFrame(wxFrame *frame, const wxString& title,
int x, int y, int w, int h)
: wxFrame(frame, wxID_ANY, title, wxPoint(x, y), wxSize(w, h))
{ {
m_shuttingDown = false; SetIcon(wxIcon(sample_xpm));
}
// `Main program' equivalent, creating windows and returning main app frame
bool MyApp::OnInit()
{
if ( !wxApp::OnInit() )
return false;
// uncomment this to get some debugging messages from the trace code
// on the console (or just set WXTRACE env variable to include "thread")
//wxLog::AddTraceMask("thread");
// Create the main frame window
MyFrame *frame = new MyFrame((wxFrame *)NULL, _T("wxWidgets threads sample"),
50, 50, 450, 340);
// Make a menubar // Make a menubar
wxMenuBar *menuBar = new wxMenuBar; wxMenuBar *menuBar = new wxMenuBar;
@@ -431,22 +357,7 @@ bool MyApp::OnInit()
menuHelp->Append(THREAD_ABOUT, _T("&About...")); menuHelp->Append(THREAD_ABOUT, _T("&About..."));
menuBar->Append(menuHelp, _T("&Help")); menuBar->Append(menuHelp, _T("&Help"));
frame->SetMenuBar(menuBar); SetMenuBar(menuBar);
// Show the frame
frame->Show(true);
SetTopWindow(frame);
return true;
}
// My frame constructor
MyFrame::MyFrame(wxFrame *frame, const wxString& title,
int x, int y, int w, int h)
: wxFrame(frame, wxID_ANY, title, wxPoint(x, y), wxSize(w, h))
{
SetIcon(wxIcon(sample_xpm));
m_nRunning = m_nCount = 0; m_nRunning = m_nCount = 0;
@@ -803,3 +714,133 @@ bool MyFrame::Cancelled()
return m_cancelled; return m_cancelled;
} }
// ----------------------------------------------------------------------------
// MyThread
// ----------------------------------------------------------------------------
MyThread::MyThread(MyFrame *frame)
: wxThread()
{
m_count = 0;
m_frame = frame;
}
MyThread::~MyThread()
{
wxCriticalSectionLocker locker(wxGetApp().m_critsect);
wxArrayThread& threads = wxGetApp().m_threads;
threads.Remove(this);
if ( threads.IsEmpty() )
{
// signal the main thread that there are no more threads left if it is
// waiting for us
if ( wxGetApp().m_shuttingDown )
{
wxGetApp().m_shuttingDown = false;
wxGetApp().m_semAllDone.Post();
}
}
}
void *MyThread::Entry()
{
wxString text;
text.Printf(wxT("Thread 0x%lx started (priority = %u).\n"),
GetId(), GetPriority());
WriteText(text);
// wxLogMessage(text); -- test wxLog thread safeness
for ( m_count = 0; m_count < 10; m_count++ )
{
// check if the application is shutting down: in this case all threads
// should stop a.s.a.p.
{
wxCriticalSectionLocker locker(wxGetApp().m_critsect);
if ( wxGetApp().m_shuttingDown )
return NULL;
}
// check if just this thread was asked to exit
if ( TestDestroy() )
break;
text.Printf(wxT("[%u] Thread 0x%lx here.\n"), m_count, GetId());
WriteText(text);
// wxSleep() can't be called from non-GUI thread!
wxThread::Sleep(1000);
}
text.Printf(wxT("Thread 0x%lx finished.\n"), GetId());
WriteText(text);
// wxLogMessage(text); -- test wxLog thread safeness
return NULL;
}
// ----------------------------------------------------------------------------
// MyWorkerThread
// ----------------------------------------------------------------------------
MyWorkerThread::MyWorkerThread(MyFrame *frame)
: wxThread()
{
m_frame = frame;
m_count = 0;
}
void MyWorkerThread::OnExit()
{
}
// define this symbol to 1 to test if the YieldFor() call in the wxProgressDialog::Update
// function provokes a race condition in which the second wxThreadEvent posted by
// MyWorkerThread::Entry is processed by the YieldFor() call of wxProgressDialog::Update
// and results in the destruction of the progress dialog itself, resulting in a crash later.
#define TEST_YIELD_RACE_CONDITION 0
void *MyWorkerThread::Entry()
{
#if TEST_YIELD_RACE_CONDITION
if ( TestDestroy() )
return NULL;
wxThreadEvent event( wxEVT_COMMAND_THREAD, WORKER_EVENT );
event.SetInt( 50 );
wxQueueEvent( m_frame, event.Clone() );
event.SetInt(-1);
wxQueueEvent( m_frame, event.Clone() );
#else
for ( m_count = 0; !m_frame->Cancelled() && (m_count < 100); m_count++ )
{
// check if we were asked to exit
if ( TestDestroy() )
break;
// create any type of command event here
wxThreadEvent event( wxEVT_COMMAND_THREAD, WORKER_EVENT );
event.SetInt( m_count );
// send in a thread-safe way
wxQueueEvent( m_frame, event.Clone() );
wxMilliSleep(200);
}
wxThreadEvent event( wxEVT_COMMAND_THREAD, WORKER_EVENT );
event.SetInt(-1); // that's all
wxQueueEvent( m_frame, event.Clone() );
#endif
return NULL;
}