correct GetBestSize() to return correct best size, i.e. the same size as AutoSize...

[wxWidgets.git] / src / msw / thread.cpp

diff --git a/src/msw/thread.cpp b/src/msw/thread.cpp
index 0a1d611ca4c8ecc48d0ba8e3b17afc0888fa180f..ee7fec670d7dc528a62ed77011bcc87b246122db 100644 (file)
--- a/src/msw/thread.cpp
+++ b/src/msw/thread.cpp
@@ -10,10 +10,6 @@
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 

-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-    #pragma implementation "thread.h"
-#endif
-

 // ----------------------------------------------------------------------------
 // headers
 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------
 // headers
 // ----------------------------------------------------------------------------


@@ -25,20 +21,24 @@
     #pragma hdrstop
 #endif
 
     #pragma hdrstop
 #endif
 

+#if wxUSE_THREADS
+
+#include "wx/thread.h"
+

 #ifndef WX_PRECOMP
 #ifndef WX_PRECOMP

+    #include "wx/msw/missing.h"

     #include "wx/intl.h"
     #include "wx/app.h"
     #include "wx/intl.h"
     #include "wx/app.h"

+    #include "wx/module.h"

 #endif
 
 #endif
 

-#if wxUSE_THREADS
-

 #include "wx/apptrait.h"
 #include "wx/apptrait.h"

+#include "wx/scopeguard.h"

 
 #include "wx/msw/private.h"
 
 #include "wx/msw/private.h"

-#include "wx/msw/missing.h"
+#include "wx/msw/seh.h"

 
 

-#include "wx/module.h"
-#include "wx/thread.h"
+#include "wx/except.h"

 
 // must have this symbol defined to get _beginthread/_endthread declarations
 #ifndef _MT
 
 // must have this symbol defined to get _beginthread/_endthread declarations
 #ifndef _MT


@@ -355,14 +355,22 @@ wxSemaError wxSemaphoreInternal::Post()
 {
 #if !defined(_WIN32_WCE) || (_WIN32_WCE >= 300)
     if ( !::ReleaseSemaphore(m_semaphore, 1, NULL /* ptr to previous count */) )
 {
 #if !defined(_WIN32_WCE) || (_WIN32_WCE >= 300)
     if ( !::ReleaseSemaphore(m_semaphore, 1, NULL /* ptr to previous count */) )

-#endif

     {
     {

-        wxLogLastError(_T("ReleaseSemaphore"));
-
-        return wxSEMA_MISC_ERROR;
+        if ( GetLastError() == ERROR_TOO_MANY_POSTS )
+        {
+            return wxSEMA_OVERFLOW;
+        }
+        else
+        {
+            wxLogLastError(_T("ReleaseSemaphore"));
+            return wxSEMA_MISC_ERROR;
+        }

     }
 
     return wxSEMA_NO_ERROR;
     }
 
     return wxSEMA_NO_ERROR;

+#else
+    return wxSEMA_MISC_ERROR;
+#endif

 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------


@@ -431,9 +439,16 @@ public:
     HANDLE GetHandle() const { return m_hThread; }
     DWORD  GetId() const { return m_tid; }
 
     HANDLE GetHandle() const { return m_hThread; }
     DWORD  GetId() const { return m_tid; }
 

-    // thread function
+    // the thread function forwarding to DoThreadStart

     static THREAD_RETVAL THREAD_CALLCONV WinThreadStart(void *thread);
 
     static THREAD_RETVAL THREAD_CALLCONV WinThreadStart(void *thread);
 

+    // really start the thread (if it's not already dead)
+    static THREAD_RETVAL DoThreadStart(wxThread *thread);
+
+    // call OnExit() on the thread
+    static void DoThreadOnExit(wxThread *thread);
+
+

     void KeepAlive()
     {
         if ( m_thread->IsDetached() )
     void KeepAlive()
     {
         if ( m_thread->IsDetached() )


@@ -475,49 +490,82 @@ private:
     wxThreadInternal& m_thrImpl;
 };
 
     wxThreadInternal& m_thrImpl;
 };
 

-
-THREAD_RETVAL THREAD_CALLCONV wxThreadInternal::WinThreadStart(void *param)
+/* static */
+void wxThreadInternal::DoThreadOnExit(wxThread *thread)

 {
 {

-    THREAD_RETVAL rc;
+    wxTRY
+    {
+        thread->OnExit();
+    }
+    wxCATCH_ALL( wxTheApp->OnUnhandledException(); )
+}

 
 

-    wxThread * const thread = (wxThread *)param;
+/* static */
+THREAD_RETVAL wxThreadInternal::DoThreadStart(wxThread *thread)
+{
+    wxON_BLOCK_EXIT1(DoThreadOnExit, thread);

 
 

-    // first of all, check whether we hadn't been cancelled already and don't
-    // start the user code at all then
-    bool isExited = (thread->m_internal->GetState() == STATE_EXITED);
+    THREAD_RETVAL rc = (THREAD_RETVAL)-1;

 
 

-    if ( isExited )
-    {
-        rc = (THREAD_RETVAL)-1;
-    }
-    else // do run thread
+    wxTRY

     {
         // store the thread object in the TLS
         if ( !::TlsSetValue(gs_tlsThisThread, thread) )
         {
             wxLogSysError(_("Can not start thread: error writing TLS."));
 
     {
         // store the thread object in the TLS
         if ( !::TlsSetValue(gs_tlsThisThread, thread) )
         {
             wxLogSysError(_("Can not start thread: error writing TLS."));
 

-            return (DWORD)-1;
+            return (THREAD_RETVAL)-1;

         }
 
         rc = (THREAD_RETVAL)thread->Entry();
     }
         }
 
         rc = (THREAD_RETVAL)thread->Entry();
     }

+    wxCATCH_ALL( wxTheApp->OnUnhandledException(); )
+
+    return rc;
+}
+
+/* static */
+THREAD_RETVAL THREAD_CALLCONV wxThreadInternal::WinThreadStart(void *param)
+{
+    THREAD_RETVAL rc = (THREAD_RETVAL)-1;
+
+    wxThread * const thread = (wxThread *)param;
+
+    // each thread has its own SEH translator so install our own a.s.a.p.
+    DisableAutomaticSETranslator();
+
+    // first of all, check whether we hadn't been cancelled already and don't
+    // start the user code at all then
+    const bool hasExited = thread->m_internal->GetState() == STATE_EXITED;
+
+    // run the thread function itself inside a SEH try/except block
+    wxSEH_TRY
+    {
+        if ( hasExited )
+            DoThreadOnExit(thread);
+        else
+            rc = DoThreadStart(thread);
+    }
+    wxSEH_HANDLE((THREAD_RETVAL)-1)

 
 

-    thread->OnExit();

 
     // save IsDetached because thread object can be deleted by joinable
     // threads after state is changed to STATE_EXITED.
 
     // save IsDetached because thread object can be deleted by joinable
     // threads after state is changed to STATE_EXITED.

-    bool isDetached = thread->IsDetached();
-
-    if (!isExited)
+    const bool isDetached = thread->IsDetached();
+    if ( !hasExited )

     {
         // enter m_critsect before changing the thread state
     {
         // enter m_critsect before changing the thread state

-        wxCriticalSectionLocker lock(thread->m_critsect);
+        //
+        // NB: can't use wxCriticalSectionLocker here as we use SEH and it's
+        //     incompatible with C++ object dtors
+        thread->m_critsect.Enter();

         thread->m_internal->SetState(STATE_EXITED);
         thread->m_internal->SetState(STATE_EXITED);

+        thread->m_critsect.Leave();

     }
 
     // the thread may delete itself now if it wants, we don't need it any more
     }
 
     // the thread may delete itself now if it wants, we don't need it any more

-    if (isDetached) thread->m_internal->LetDie();
+    if ( isDetached )
+        thread->m_internal->LetDie();

 
     return rc;
 }
 
     return rc;
 }


@@ -633,14 +681,11 @@ wxThreadInternal::WaitForTerminate(wxCriticalSection& cs,
 
     wxThread::ExitCode rc = 0;
 
 
     wxThread::ExitCode rc = 0;
 

-    // Delete() is always safe to call, so consider all possible states
-
-    // we might need to resume the thread, but we might also not need to cancel
-    // it if it doesn't run yet
-    bool shouldResume = false,
-         isRunning = false;
+    // we might need to resume the thread if it's currently stopped
+    bool shouldResume = false;

 
 

-    // check if the thread already started to run
+    // as Delete() (which calls us) is always safe to call we need to consider
+    // all possible states

     {
         wxCriticalSectionLocker lock(cs);
 
     {
         wxCriticalSectionLocker lock(cs);
 


@@ -653,20 +698,17 @@ wxThreadInternal::WaitForTerminate(wxCriticalSection& cs,
                 // to let it run
                 m_state = STATE_EXITED;
 
                 // to let it run
                 m_state = STATE_EXITED;
 

-                Resume();   // it knows about STATE_EXITED special case
-
+                // we must call Resume() as the thread hasn't been initially
+                // resumed yet (and as Resume() it knows about STATE_EXITED
+                // special case, it won't touch it and WinThreadStart() will
+                // just exit immediately)
+                shouldResume = true;

                 shouldDelete = false;
             }
                 shouldDelete = false;
             }

-
-            isRunning = true;
-
-            // shouldResume is correctly set to false here
+            //else: shouldResume is correctly set to false here, wait until
+            //      someone else runs the thread and it finishes

         }
         }

-        else if ( m_state == STATE_EXITED )
-        {
-            return wxTHREAD_NOT_RUNNING;
-        }
-        else // running (but maybe paused or cancelled)
+        else // running, paused, cancelled or even exited

         {
             shouldResume = m_state == STATE_PAUSED;
         }
         {
             shouldResume = m_state == STATE_PAUSED;
         }


@@ -676,104 +718,100 @@ wxThreadInternal::WaitForTerminate(wxCriticalSection& cs,
     if ( shouldResume )
         Resume();
 
     if ( shouldResume )
         Resume();
 

-    // is it still running?
-    if ( isRunning || m_state == STATE_RUNNING )
+    // ask the thread to terminate
+    if ( shouldDelete )
+    {
+        wxCriticalSectionLocker lock(cs);
+
+        Cancel();
+    }
+
+
+    // now wait for thread to finish
+    if ( wxThread::IsMain() )
+    {
+        // set flag for wxIsWaitingForThread()
+        gs_waitingForThread = true;
+    }
+
+    // we can't just wait for the thread to terminate because it might be
+    // calling some GUI functions and so it will never terminate before we
+    // process the Windows messages that result from these functions
+    // (note that even in console applications we might have to process
+    // messages if we use wxExecute() or timers or ...)
+    DWORD result wxDUMMY_INITIALIZE(0);
+    do

     {
         if ( wxThread::IsMain() )
         {
     {
         if ( wxThread::IsMain() )
         {

-            // set flag for wxIsWaitingForThread()
-            gs_waitingForThread = true;
+            // give the thread we're waiting for chance to do the GUI call
+            // it might be in
+            if ( (gs_nWaitingForGui > 0) && wxGuiOwnedByMainThread() )
+            {
+                wxMutexGuiLeave();
+            }

         }
 
         }
 

-        // ask the thread to terminate
-        if ( shouldDelete )
-        {
-            wxCriticalSectionLocker lock(cs);
+#if !defined(QS_ALLPOSTMESSAGE)
+#define QS_ALLPOSTMESSAGE 0
+#endif

 
 

-            Cancel();
-        }
+        result = ::MsgWaitForMultipleObjects
+                 (
+                   1,              // number of objects to wait for
+                   &m_hThread,     // the objects
+                   false,          // don't wait for all objects
+                   INFINITE,       // no timeout
+                   QS_ALLINPUT|QS_ALLPOSTMESSAGE   // return as soon as there are any events
+                 );

 
 

-        // we can't just wait for the thread to terminate because it might be
-        // calling some GUI functions and so it will never terminate before we
-        // process the Windows messages that result from these functions
-        // (note that even in console applications we might have to process
-        // messages if we use wxExecute() or timers or ...)
-        DWORD result wxDUMMY_INITIALIZE(0);
-        do
+        switch ( result )

         {
         {

-            if ( wxThread::IsMain() )
-            {
-                // give the thread we're waiting for chance to do the GUI call
-                // it might be in
-                if ( (gs_nWaitingForGui > 0) && wxGuiOwnedByMainThread() )
+            case 0xFFFFFFFF:
+                // error
+                wxLogSysError(_("Can not wait for thread termination"));
+                Kill();
+                return wxTHREAD_KILLED;
+
+            case WAIT_OBJECT_0:
+                // thread we're waiting for terminated
+                break;
+
+            case WAIT_OBJECT_0 + 1:
+                // new message arrived, process it -- but only if we're the
+                // main thread as we don't support processing messages in
+                // the other ones
+                //
+                // NB: we still must include QS_ALLINPUT even when waiting
+                //     in a secondary thread because if it had created some
+                //     window somehow (possible not even using wxWidgets)
+                //     the system might dead lock then
+                if ( wxThread::IsMain() )

                 {
                 {

-                    wxMutexGuiLeave();
-                }
-            }
+                    wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits()
+                                                   : NULL;

 
 

-            result = ::MsgWaitForMultipleObjects
-                     (
-                       1,              // number of objects to wait for
-                       &m_hThread,     // the objects
-                       false,          // don't wait for all objects
-                       INFINITE,       // no timeout
-                       QS_ALLINPUT |   // return as soon as there are any events
-                       QS_ALLPOSTMESSAGE
-                     );
-
-            switch ( result )
-            {
-                case 0xFFFFFFFF:
-                    // error
-                    wxLogSysError(_("Can not wait for thread termination"));
-                    Kill();
-                    return wxTHREAD_KILLED;
-
-                case WAIT_OBJECT_0:
-                    // thread we're waiting for terminated
-                    break;
-
-                case WAIT_OBJECT_0 + 1:
-                    // new message arrived, process it -- but only if we're the
-                    // main thread as we don't support processing messages in
-                    // the other ones
-                    //
-                    // NB: we still must include QS_ALLINPUT even when waiting
-                    //     in a secondary thread because if it had created some
-                    //     window somehow (possible not even using wxWidgets)
-                    //     the system might dead lock then
-                    if ( wxThread::IsMain() )
+                    if ( traits && !traits->DoMessageFromThreadWait() )

                     {
                     {

-                        // it looks that sometimes WAIT_OBJECT_0 + 1 is
-                        // returned but there are no messages in the thread
-                        // queue -- prevent DoMessageFromThreadWait() from
-                        // blocking inside ::GetMessage() forever in this case
-                        ::PostMessage(NULL, WM_NULL, 0, 0);
-
-                        wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits()
-                                                       : NULL;
-
-                        if ( traits && !traits->DoMessageFromThreadWait() )
-                        {
-                            // WM_QUIT received: kill the thread
-                            Kill();
-
-                            return wxTHREAD_KILLED;
-                        }
-                    }
-                    break;
+                        // WM_QUIT received: kill the thread
+                        Kill();

 
 

-                default:
-                    wxFAIL_MSG(wxT("unexpected result of MsgWaitForMultipleObject"));
-            }
-        } while ( result != WAIT_OBJECT_0 );
+                        return wxTHREAD_KILLED;
+                    }
+                }
+                break;

 
 

-        if ( wxThread::IsMain() )
-        {
-            gs_waitingForThread = false;
+            default:
+                wxFAIL_MSG(wxT("unexpected result of MsgWaitForMultipleObject"));

         }
         }

+    } while ( result != WAIT_OBJECT_0 );
+
+    if ( wxThread::IsMain() )
+    {
+        gs_waitingForThread = false;

     }
 
     }
 

+

     // although the thread might be already in the EXITED state it might not
     // have terminated yet and so we are not sure that it has actually
     // terminated if the "if" above hadn't been taken
     // although the thread might be already in the EXITED state it might not
     // have terminated yet and so we are not sure that it has actually
     // terminated if the "if" above hadn't been taken


@@ -834,7 +872,7 @@ bool wxThreadInternal::Resume()
 
     // don't change the state from STATE_EXITED because it's special and means
     // we are going to terminate without running any user code - if we did it,
 
     // don't change the state from STATE_EXITED because it's special and means
     // we are going to terminate without running any user code - if we did it,

-    // the codei n Delete() wouldn't work
+    // the code in WaitForTerminate() wouldn't work

     if ( m_state != STATE_EXITED )
     {
         m_state = STATE_RUNNING;
     if ( m_state != STATE_EXITED )
     {
         m_state = STATE_RUNNING;


@@ -891,10 +929,9 @@ unsigned long wxThread::GetCurrentId()
     return (unsigned long)::GetCurrentThreadId();
 }
 
     return (unsigned long)::GetCurrentThreadId();
 }
 

-bool wxThread::SetConcurrency(size_t level)
+bool wxThread::SetConcurrency(size_t WXUNUSED_IN_WINCE(level))

 {
 #ifdef __WXWINCE__
 {
 #ifdef __WXWINCE__

-    wxUnusedVar(level);

     return false;
 #else
     wxASSERT_MSG( IsMain(), _T("should only be called from the main thread") );
     return false;
 #else
     wxASSERT_MSG( IsMain(), _T("should only be called from the main thread") );


@@ -933,7 +970,7 @@ bool wxThread::SetConcurrency(size_t level)
             dwProcMask |= bit;
 
             // another process added
             dwProcMask |= bit;
 
             // another process added

-            if ( !--level )
+            if ( --level == 0 )

             {
                 // and that's enough
                 break;
             {
                 // and that's enough
                 break;


@@ -1353,4 +1390,3 @@ bool WXDLLIMPEXP_BASE wxIsWaitingForThread()
 #include "wx/thrimpl.cpp"
 
 #endif // wxUSE_THREADS
 #include "wx/thrimpl.cpp"
 
 #endif // wxUSE_THREADS

-