// create a new (suspended) thread (for the given thread object)
bool Create(wxThread *thread, unsigned int stackSize);
+ // wait for the thread to terminate, either by itself, or by asking it
+ // (politely, this is not Kill()!) to do it
+ wxThreadError WaitForTerminate(bool shouldCancel,
+ wxCriticalSection& cs,
+ wxThread::ExitCode *pRc);
+
+ // kill the thread unconditionally
+ wxThreadError Kill();
+
// suspend/resume/terminate
bool Suspend();
bool Resume();
return TRUE;
}
+wxThreadError wxThreadInternal::Kill()
+{
+ if ( !::TerminateThread(m_hThread, (DWORD)-1) )
+ {
+ wxLogSysError(_("Couldn't terminate thread"));
+
+ return wxTHREAD_MISC_ERROR;
+ }
+
+ Free();
+
+ return wxTHREAD_NO_ERROR;
+}
+
+wxThreadError
+wxThreadInternal::WaitForTerminate(bool shouldCancel,
+ wxCriticalSection& cs,
+ wxThread::ExitCode *pRc)
+{
+ 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;
+
+ // check if the thread already started to run
+ {
+ wxCriticalSectionLocker lock(cs);
+
+ if ( m_state == STATE_NEW )
+ {
+ if ( shouldCancel )
+ {
+ // WinThreadStart() will see it and terminate immediately, no need
+ // to cancel the thread - but we still need to resume it to let it
+ // run
+ m_state = STATE_EXITED;
+
+ Resume(); // it knows about STATE_EXITED special case
+
+ shouldCancel = FALSE;
+ }
+
+ isRunning = TRUE;
+
+ // shouldResume is correctly set to FALSE here
+ }
+ else
+ {
+ shouldResume = m_state == STATE_PAUSED;
+ }
+ }
+
+ // resume the thread if it is paused
+ if ( shouldResume )
+ Resume();
+
+ // does is still run?
+ if ( isRunning || m_state == STATE_RUNNING )
+ {
+ if ( wxThread::IsMain() )
+ {
+ // set flag for wxIsWaitingForThread()
+ gs_waitingForThread = TRUE;
+ }
+
+ // ask the thread to terminate
+ if ( shouldCancel )
+ {
+ wxCriticalSectionLocker lock(cs);
+
+ Cancel();
+ }
+
+ // 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 = 0; // suppress warnings from broken compilers
+ do
+ {
+ 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() )
+ {
+ wxMutexGuiLeave();
+ }
+ }
+
+ 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
+ {
+ // 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;
+
+ 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
+ do
+ {
+ if ( !::GetExitCodeThread(m_hThread, (LPDWORD)&rc) )
+ {
+ wxLogLastError(wxT("GetExitCodeThread"));
+
+ rc = (wxThread::ExitCode)-1;
+ }
+ } while ( (DWORD)rc == STILL_ACTIVE );
+
+ if ( pRc )
+ *pRc = rc;
+
+ return rc == (wxThread::ExitCode)-1 ? wxTHREAD_MISC_ERROR
+ : wxTHREAD_NO_ERROR;
+}
+
bool wxThreadInternal::Suspend()
{
DWORD nSuspendCount = ::SuspendThread(m_hThread);
// although under Windows we can wait for any thread, it's an error to
// wait for a detached one in wxWin API
wxCHECK_MSG( !IsDetached(), (ExitCode)-1,
- _T("can't wait for detached thread") );
+ _T("wxThread::Wait(): can't wait for detached thread") );
ExitCode rc = (ExitCode)-1;
- (void)Delete(&rc);
+ (void)m_internal->WaitForTerminate(false, m_critsect, &rc);
m_internal->Free();
+ wxCriticalSectionLocker lock(m_critsect);
+ m_internal->SetState(STATE_EXITED);
+
return rc;
}
wxThreadError wxThread::Delete(ExitCode *pRc)
{
- 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,
- shouldCancel = TRUE,
- isRunning = FALSE;
-
- // check if the thread already started to run
- {
- wxCriticalSectionLocker lock(m_critsect);
-
- if ( m_internal->GetState() == STATE_NEW )
- {
- // WinThreadStart() will see it and terminate immediately, no need
- // to cancel the thread - but we still need to resume it to let it
- // run
- m_internal->SetState(STATE_EXITED);
-
- Resume(); // it knows about STATE_EXITED special case
-
- shouldCancel = FALSE;
- isRunning = TRUE;
-
- // shouldResume is correctly set to FALSE here
- }
- else
- {
- shouldResume = IsPaused();
- }
- }
-
- // resume the thread if it is paused
- if ( shouldResume )
- Resume();
-
- HANDLE hThread = m_internal->GetHandle();
-
- // does is still run?
- if ( isRunning || IsRunning() )
- {
- if ( IsMain() )
- {
- // set flag for wxIsWaitingForThread()
- gs_waitingForThread = TRUE;
- }
-
- // ask the thread to terminate
- if ( shouldCancel )
- {
- wxCriticalSectionLocker lock(m_critsect);
-
- m_internal->Cancel();
- }
-
- // 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 = 0; // suppress warnings from broken compilers
- do
- {
- if ( IsMain() )
- {
- // give the thread we're waiting for chance to do the GUI call
- // it might be in
- if ( (gs_nWaitingForGui > 0) && wxGuiOwnedByMainThread() )
- {
- wxMutexGuiLeave();
- }
- }
-
- result = ::MsgWaitForMultipleObjects
- (
- 1, // number of objects to wait for
- &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
- {
- // 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;
-
- default:
- wxFAIL_MSG(wxT("unexpected result of MsgWaitForMultipleObject"));
- }
- } while ( result != WAIT_OBJECT_0 );
-
- if ( 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
- do
- {
- if ( !::GetExitCodeThread(hThread, (LPDWORD)&rc) )
- {
- wxLogLastError(wxT("GetExitCodeThread"));
-
- rc = (ExitCode)-1;
- }
- } while ( (DWORD)rc == STILL_ACTIVE );
+ wxThreadError rc = m_internal->WaitForTerminate(true, m_critsect, pRc);
if ( IsDetached() )
{
- // if the thread exits normally, this is done in WinThreadStart, but in
- // this case it would have been too early because
- // MsgWaitForMultipleObject() would fail if the thread handle was
- // closed while we were waiting on it, so we must do it here
delete this;
}
+ else // joinable
+ {
+ // update the status of the joinable thread
+ wxCriticalSectionLocker lock(m_critsect);
+ m_internal->SetState(STATE_EXITED);
+ }
- if ( pRc )
- *pRc = rc;
-
- return rc == (ExitCode)-1 ? wxTHREAD_MISC_ERROR : wxTHREAD_NO_ERROR;
+ return rc;
}
wxThreadError wxThread::Kill()
if ( !IsRunning() )
return wxTHREAD_NOT_RUNNING;
- if ( !::TerminateThread(m_internal->GetHandle(), (DWORD)-1) )
- {
- wxLogSysError(_("Couldn't terminate thread"));
-
- return wxTHREAD_MISC_ERROR;
- }
-
- m_internal->Free();
+ wxThreadError rc = m_internal->Kill();
if ( IsDetached() )
{
m_internal->SetState(STATE_EXITED);
}
- return wxTHREAD_NO_ERROR;
+ return rc;
}
void wxThread::Exit(ExitCode status)
projects / wxWidgets.git / commitdiff
