// 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);
+ const bool hasExited = thread->m_internal->GetState() == STATE_EXITED;
- if ( isExited )
+ if ( hasExited )
{
rc = (THREAD_RETVAL)-1;
}
// threads after state is changed to STATE_EXITED.
bool isDetached = thread->IsDetached();
- if (!isExited)
+ if ( !hasExited )
{
// enter m_critsect before changing the thread state
wxCriticalSectionLocker lock(thread->m_critsect);
}
// 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;
}
wxThread::ExitCode rc = 0;
- // Delete() is always safe to call, so consider all possible states
+ // we might need to resume the thread if it's currently stopped
+ bool shouldResume = false;
- // 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;
-
- // 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);
// 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;
}
-
- isRunning = true;
-
- // shouldResume is correctly set to false here
- }
- else if ( m_state == STATE_EXITED )
- {
- return wxTHREAD_NOT_RUNNING;
+ //else: shouldResume is correctly set to false here, wait until
+ // someone else runs the thread and it finishes
}
- else // running (but maybe paused or cancelled)
+ else // running, paused, cancelled or even exited
{
shouldResume = m_state == STATE_PAUSED;
}
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() )
{
- // 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();
- }
- }
+ // 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);
- 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() )
+ wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits()
+ : NULL;
+
+ 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
// 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;
projects / wxWidgets.git / blobdiff