X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/77ffb5937e89927b621128789401db8921fe580f..046d682f0f684977b7ba933a128f5c84e06ded0e:/src/msw/thread.cpp diff --git a/src/msw/thread.cpp b/src/msw/thread.cpp index d68183e0fd..24aa2a43fd 100644 --- a/src/msw/thread.cpp +++ b/src/msw/thread.cpp @@ -7,7 +7,7 @@ // RCS-ID: $Id$ // Copyright: (c) Wolfram Gloger (1996, 1997), Guilhem Lavaux (1998); // Vadim Zeitlin (1999-2002) -// Licence: wxWidgets licence +// Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA) @@ -484,9 +484,9 @@ THREAD_RETVAL THREAD_CALLCONV wxThreadInternal::WinThreadStart(void *param) // 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; } @@ -509,7 +509,7 @@ THREAD_RETVAL THREAD_CALLCONV wxThreadInternal::WinThreadStart(void *param) // 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); @@ -517,7 +517,8 @@ THREAD_RETVAL THREAD_CALLCONV wxThreadInternal::WinThreadStart(void *param) } // 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; } @@ -633,14 +634,11 @@ wxThreadInternal::WaitForTerminate(wxCriticalSection& cs, 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); @@ -653,20 +651,17 @@ wxThreadInternal::WaitForTerminate(wxCriticalSection& 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; } @@ -676,104 +671,103 @@ wxThreadInternal::WaitForTerminate(wxCriticalSection& cs, 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 ) + 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 ) { - wxCriticalSectionLocker lock(cs); - - Cancel(); - } + 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; - // 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() ) - { - // give the thread we're waiting for chance to do the GUI call - // it might be in - if ( (gs_nWaitingForGui > 0) && wxGuiOwnedByMainThread() ) + 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 @@ -834,7 +828,7 @@ 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, - // the codei n Delete() wouldn't work + // the code in WaitForTerminate() wouldn't work if ( m_state != STATE_EXITED ) { m_state = STATE_RUNNING; @@ -893,7 +887,10 @@ unsigned long wxThread::GetCurrentId() bool wxThread::SetConcurrency(size_t level) { -#ifndef __WXWINCE__ +#ifdef __WXWINCE__ + wxUnusedVar(level); + return false; +#else wxASSERT_MSG( IsMain(), _T("should only be called from the main thread") ); // ok only for the default one @@ -983,9 +980,9 @@ bool wxThread::SetConcurrency(size_t level) return false; } -#endif // !__WXWINCE__ return true; +#endif // __WXWINCE__/!__WXWINCE__ } // ctor and dtor