X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/3b9e3455225b670d30ee0fb67f8821ada9640f6d..fb8d7eb7a880f1f2e32d8830f9c5e12b2536e05f:/src/os2/thread.cpp?ds=sidebyside diff --git a/src/os2/thread.cpp b/src/os2/thread.cpp index 7b4a4643c8..b17b17cb83 100644 --- a/src/os2/thread.cpp +++ b/src/os2/thread.cpp @@ -1,11 +1,11 @@ ///////////////////////////////////////////////////////////////////////////// -// Name: thread.cpp -// Purpose: wxThread Implementation. For Unix ports, see e.g. src/gtk -// Author: Original from Wolfram Gloger/Guilhem Lavaux -// Modified by: David Webster +// Name: src/os2/thread.cpp +// Purpose: wxThread Implementation +// Author: Original from Wolfram Gloger/Guilhem Lavaux/David Webster +// Modified by: Stefan Neis // Created: 04/22/98 // RCS-ID: $Id$ -// Copyright: (c) Wolfram Gloger (1996, 1997); Guilhem Lavaux (1998) +// Copyright: (c) Stefan Neis (2003) // Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// @@ -18,17 +18,28 @@ #if wxUSE_THREADS -#include - -#include "wx/module.h" #include "wx/thread.h" +#ifndef WX_PRECOMP + #include "wx/intl.h" + #include "wx/log.h" + #include "wx/app.h" + #include "wx/module.h" +#endif //WX_PRECOMP + +#include "wx/apptrait.h" +#include "wx/utils.h" + +#include + #define INCL_DOSSEMAPHORES #define INCL_DOSPROCESS +#define INCL_DOSMISC #define INCL_ERRORS #include +#ifndef __EMX__ #include - +#endif // the possible states of the thread ("=>" shows all possible transitions from // this state) enum wxThreadState @@ -41,36 +52,36 @@ enum wxThreadState }; // ---------------------------------------------------------------------------- -// static variables +// this module's globals // ---------------------------------------------------------------------------- // id of the main thread - the one which can call GUI functions without first // calling wxMutexGuiEnter() -static ULONG s_ulIdMainThread = 0; +wxThreadIdType wxThread::ms_idMainThread = 0; wxMutex* p_wxMainMutex; // OS2 substitute for Tls pointer the current parent thread object -wxThread* m_pThread; // pointer to the wxWindows thread object +wxThread* m_pThread; // pointer to the wxWidgets thread object -// if it's FALSE, some secondary thread is holding the GUI lock -static bool s_bGuiOwnedByMainThread = TRUE; +// if it's false, some secondary thread is holding the GUI lock +static bool gs_bGuiOwnedByMainThread = true; // critical section which controls access to all GUI functions: any secondary // thread (i.e. except the main one) must enter this crit section before doing // any GUI calls -static wxCriticalSection *s_pCritsectGui = NULL; +static wxCriticalSection *gs_pCritsectGui = NULL; // critical section which protects s_nWaitingForGui variable -static wxCriticalSection *s_pCritsectWaitingForGui = NULL; +static wxCriticalSection *gs_pCritsectWaitingForGui = NULL; // number of threads waiting for GUI in wxMutexGuiEnter() -static size_t s_nWaitingForGui = 0; +static size_t gs_nWaitingForGui = 0; // are we waiting for a thread termination? -static bool s_bWaitingForThread = FALSE; +static bool gs_bWaitingForThread = false; // ============================================================================ -// OS/2 implementation of thread classes +// OS/2 implementation of thread and related classes // ============================================================================ // ---------------------------------------------------------------------------- @@ -79,38 +90,64 @@ static bool s_bWaitingForThread = FALSE; class wxMutexInternal { public: + wxMutexInternal(wxMutexType mutexType); + ~wxMutexInternal(); + + bool IsOk() const { return m_vMutex != NULL; } + + wxMutexError Lock() { return LockTimeout(SEM_INDEFINITE_WAIT); } + wxMutexError Lock(unsigned long ms) { return LockTimeout(ms); } + wxMutexError TryLock(); + wxMutexError Unlock(); + +private: + wxMutexError LockTimeout(ULONG ulMilliseconds); HMTX m_vMutex; }; -wxMutex::wxMutex() +// all mutexes are "pseudo-"recursive under OS2 so we don't use mutexType +// (Calls to DosRequestMutexSem and DosReleaseMutexSem can be nested, but +// the request count for a semaphore cannot exceed 65535. If an attempt is +// made to exceed this number, ERROR_TOO_MANY_SEM_REQUESTS is returned.) +wxMutexInternal::wxMutexInternal(wxMutexType WXUNUSED(eMutexType)) { - APIRET ulrc; - - m_internal = new wxMutexInternal; - ulrc = ::DosCreateMutexSem(NULL, &m_internal->m_vMutex, 0L, FALSE); + APIRET ulrc = ::DosCreateMutexSem(NULL, &m_vMutex, 0L, FALSE); if (ulrc != 0) { - wxLogSysError(_("Can not create mutex.")); + wxLogSysError(_("Cannot create mutex.")); + m_vMutex = NULL; } - m_locked = 0; } -wxMutex::~wxMutex() +wxMutexInternal::~wxMutexInternal() { - if (m_locked > 0) - wxLogDebug(wxT("Warning: freeing a locked mutex (%d locks)."), m_locked); - ::DosCloseMutexSem(m_internal->m_vMutex); - m_internal->m_vMutex = NULL; + if (m_vMutex) + { + if (::DosCloseMutexSem(m_vMutex)) + { + wxLogLastError(wxT("DosCloseMutexSem(mutex)")); + } + } } -wxMutexError wxMutex::Lock() +wxMutexError wxMutexInternal::TryLock() +{ + const wxMutexError rc = LockTimeout( SEM_IMMEDIATE_RETURN ); + + // we have a special return code for timeout in this case + return rc == wxMUTEX_TIMEOUT ? wxMUTEX_BUSY : rc; +} + +wxMutexError wxMutexInternal::LockTimeout(ULONG ulMilliseconds) { APIRET ulrc; - ulrc = ::DosRequestMutexSem(m_internal->m_vMutex, SEM_INDEFINITE_WAIT); + ulrc = ::DosRequestMutexSem(m_vMutex, ulMilliseconds); switch (ulrc) { + case ERROR_TIMEOUT: + return wxMUTEX_TIMEOUT; case ERROR_TOO_MANY_SEM_REQUESTS: return wxMUTEX_BUSY; @@ -124,34 +161,18 @@ wxMutexError wxMutex::Lock() wxLogSysError(_("Couldn't acquire a mutex lock")); return wxMUTEX_MISC_ERROR; - case ERROR_TIMEOUT: default: wxFAIL_MSG(wxT("impossible return value in wxMutex::Lock")); - } - m_locked++; - return wxMUTEX_NO_ERROR; -} - -wxMutexError wxMutex::TryLock() -{ - ULONG ulrc; - - ulrc = ::DosRequestMutexSem(m_internal->m_vMutex, SEM_IMMEDIATE_RETURN /*0L*/); - if (ulrc == ERROR_TIMEOUT || ulrc == ERROR_TOO_MANY_SEM_REQUESTS) - return wxMUTEX_BUSY; - - m_locked++; + return wxMUTEX_MISC_ERROR; + } return wxMUTEX_NO_ERROR; } -wxMutexError wxMutex::Unlock() +wxMutexError wxMutexInternal::Unlock() { APIRET ulrc; - if (m_locked > 0) - m_locked--; - - ulrc = ::DosReleaseMutexSem(m_internal->m_vMutex); + ulrc = ::DosReleaseMutexSem(m_vMutex); if (ulrc != 0) { wxLogSysError(_("Couldn't release a mutex")); @@ -160,126 +181,163 @@ wxMutexError wxMutex::Unlock() return wxMUTEX_NO_ERROR; } -// ---------------------------------------------------------------------------- -// wxCondition implementation -// ---------------------------------------------------------------------------- +// -------------------------------------------------------------------------- +// wxSemaphore +// -------------------------------------------------------------------------- -class wxConditionInternal +// a trivial wrapper around OS2 event semaphore +class wxSemaphoreInternal { public: - inline wxConditionInternal () - { - ::DosCreateEventSem(NULL, &m_vEvent, DC_SEM_SHARED, FALSE); - if (!m_vEvent) - { - wxLogSysError(_("Can not create event semaphore.")); - } - m_nWaiters = 0; - } + wxSemaphoreInternal(int initialcount, int maxcount); + ~wxSemaphoreInternal(); - inline bool Wait( - unsigned long ulTimeout - ) - { - APIRET ulrc; + bool IsOk() const { return m_vEvent != NULL; } - m_nWaiters++; - ulrc = ::DosWaitEventSem(m_vEvent, ulTimeout); - m_nWaiters--; - return (ulrc != ERROR_TIMEOUT); - } + wxSemaError Wait() { return WaitTimeout(SEM_INDEFINITE_WAIT); } + wxSemaError TryWait() { return WaitTimeout(SEM_IMMEDIATE_RETURN); } + wxSemaError WaitTimeout(unsigned long milliseconds); - inline ~wxConditionInternal () - { - APIRET ulrc; + wxSemaError Post(); - if (m_vEvent) - { - ulrc = ::DosCloseEventSem(m_vEvent); - if (!ulrc) - { - wxLogLastError("DosCloseEventSem(m_vEvent)"); - } - } - } - - HEV m_vEvent; - int m_nWaiters; +private: + HEV m_vEvent; + HMTX m_vMutex; + int m_count; + int m_maxcount; }; -wxCondition::wxCondition() +wxSemaphoreInternal::wxSemaphoreInternal(int initialcount, int maxcount) { - APIRET ulrc; - ULONG ulCount; + APIRET ulrc; + if ( maxcount == 0 ) + { + // make it practically infinite + maxcount = INT_MAX; + } - m_internal = new wxConditionInternal; - ulrc = ::DosCreateEventSem(NULL, &m_internal->m_vEvent, 0L, FALSE); + m_count = initialcount; + m_maxcount = maxcount; + ulrc = ::DosCreateMutexSem(NULL, &m_vMutex, 0L, FALSE); if (ulrc != 0) { - wxLogSysError(_("Can not create event object.")); + wxLogLastError(wxT("DosCreateMutexSem()")); + m_vMutex = NULL; + m_vEvent = NULL; + return; } - m_internal->m_nWaiters = 0; - // ?? just for good measure? - ::DosResetEventSem(m_internal->m_vEvent, &ulCount); -} - -wxCondition::~wxCondition() -{ - ::DosCloseEventSem(m_internal->m_vEvent); - delete m_internal; - m_internal = NULL; -} - -void wxCondition::Wait() -{ - (void)m_internal->Wait(SEM_INFINITE_WAIT); -} - -bool wxCondition::Wait( - unsigned long lSec -, unsigned long lNsec) -{ - return m_internal->Wait(lSec*1000 + lNsec/1000000); -} - -void wxCondition::Signal() -{ - ::DosPostEventSem(m_internal->m_vEvent); + ulrc = ::DosCreateEventSem(NULL, &m_vEvent, 0L, FALSE); + if ( ulrc != 0) + { + wxLogLastError(wxT("DosCreateEventSem()")); + ::DosCloseMutexSem(m_vMutex); + m_vMutex = NULL; + m_vEvent = NULL; + } + if (initialcount) + ::DosPostEventSem(m_vEvent); } -void wxCondition::Broadcast() +wxSemaphoreInternal::~wxSemaphoreInternal() { - int i; - - for (i = 0; i < m_internal->m_nWaiters; i++) + if ( m_vEvent ) { - if (::DosPostEventSem(m_internal->m_vEvent) != 0) + if ( ::DosCloseEventSem(m_vEvent) ) { - wxLogSysError(_("Couldn't change the state of event object.")); + wxLogLastError(wxT("DosCloseEventSem(semaphore)")); } + if ( ::DosCloseMutexSem(m_vMutex) ) + { + wxLogLastError(wxT("DosCloseMutexSem(semaphore)")); + } + else + m_vEvent = NULL; } } -// ---------------------------------------------------------------------------- -// wxCriticalSection implementation -// ---------------------------------------------------------------------------- - -wxCriticalSection::wxCriticalSection() +wxSemaError wxSemaphoreInternal::WaitTimeout(unsigned long ulMilliseconds) { + APIRET ulrc; + do { + ulrc = ::DosWaitEventSem(m_vEvent, ulMilliseconds ); + switch ( ulrc ) + { + case NO_ERROR: + break; + + case ERROR_TIMEOUT: + if (ulMilliseconds == SEM_IMMEDIATE_RETURN) + return wxSEMA_BUSY; + else + return wxSEMA_TIMEOUT; + + default: + wxLogLastError(wxT("DosWaitEventSem(semaphore)")); + return wxSEMA_MISC_ERROR; + } + ulrc = :: DosRequestMutexSem(m_vMutex, ulMilliseconds); + switch ( ulrc ) + { + case NO_ERROR: + // ok + break; + + case ERROR_TIMEOUT: + case ERROR_TOO_MANY_SEM_REQUESTS: + if (ulMilliseconds == SEM_IMMEDIATE_RETURN) + return wxSEMA_BUSY; + else + return wxSEMA_TIMEOUT; + + default: + wxFAIL_MSG(wxT("DosRequestMutexSem(mutex)")); + return wxSEMA_MISC_ERROR; + } + bool OK = false; + if (m_count > 0) + { + m_count--; + OK = true; + } + else + { + ULONG ulPostCount; + ::DosResetEventSem(m_vEvent, &ulPostCount); + } + ::DosReleaseMutexSem(m_vMutex); + if (OK) + return wxSEMA_NO_ERROR; + } while (ulMilliseconds == SEM_INDEFINITE_WAIT); + + if (ulMilliseconds == SEM_IMMEDIATE_RETURN) + return wxSEMA_BUSY; + return wxSEMA_TIMEOUT; } -wxCriticalSection::~wxCriticalSection() +wxSemaError wxSemaphoreInternal::Post() { -} + APIRET ulrc; + ulrc = ::DosRequestMutexSem(m_vMutex, SEM_INDEFINITE_WAIT); + if (ulrc != NO_ERROR) + return wxSEMA_MISC_ERROR; + bool OK = false; + if (m_count < m_maxcount) + { + m_count++; + ulrc = ::DosPostEventSem(m_vEvent); + OK = true; + } + ::DosReleaseMutexSem(m_vMutex); + if (!OK) + return wxSEMA_OVERFLOW; + if ( ulrc != NO_ERROR && ulrc != ERROR_ALREADY_POSTED ) + { + wxLogLastError(wxT("DosPostEventSem(semaphore)")); -void wxCriticalSection::Enter() -{ - ::DosEnterCritSec(); -} + return wxSEMA_MISC_ERROR; + } -void wxCriticalSection::Leave() -{ - ::DosExitCritSec(); + return wxSEMA_NO_ERROR; } // ---------------------------------------------------------------------------- @@ -296,25 +354,18 @@ public: { m_hThread = 0; m_eState = STATE_NEW; - m_nPriority = 0; + m_nPriority = wxPRIORITY_DEFAULT; } ~wxThreadInternal() { - Free(); - } - - void Free() - { - if (m_hThread) - { - ::DosExit(0,0); - m_hThread = 0; - } + m_hThread = 0; } // create a new (suspended) thread (for the given thread object) - bool Create(wxThread* pThread); + bool Create( wxThread* pThread + ,unsigned int uStackSize + ); // suspend/resume/terminate bool Suspend(); @@ -334,33 +385,52 @@ public: TID GetId() const { return m_hThread; } // thread function - static DWORD OS2ThreadStart(wxThread *thread); + static void OS2ThreadStart(void* pParam); private: // Threads in OS/2 have only an ID, so m_hThread is both it's handle and ID // PM also has no real Tls mechanism to index pointers by so we'll just - // keep track of the wxWindows parent object here. + // keep track of the wxWidgets parent object here. TID m_hThread; // handle and ID of the thread wxThreadState m_eState; // state, see wxThreadState enum unsigned int m_nPriority; // thread priority in "wx" units }; -ULONG wxThreadInternal::OS2ThreadStart( - wxThread* pThread -) +void wxThreadInternal::OS2ThreadStart( void * pParam ) { - m_pThread = pThread; + DWORD dwRet; + bool bWasCancelled; - DWORD dwRet = (DWORD)pThread->Entry(); + wxThread *pThread = (wxThread *)pParam; - // enter m_critsect before changing the thread state + // first of all, wait for the thread to be started. pThread->m_critsect.Enter(); + pThread->m_critsect.Leave(); + // Now check whether we hadn't been cancelled already and don't + // start the user code at all in this case. + if ( pThread->m_internal->GetState() == STATE_EXITED ) + { + dwRet = (DWORD)-1; + bWasCancelled = true; + } + else // do run thread + { + wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits() : NULL; + unsigned long ulHab; + if (traits) + traits->InitializeGui(ulHab); + dwRet = (DWORD)pThread->Entry(); + if (traits) + traits->TerminateGui(ulHab); - bool bWasCancelled = thread->m_internal->GetState() == STATE_CANCELED; + // enter m_critsect before changing the thread state + pThread->m_critsect.Enter(); - pThread->m_internal->SetState(STATE_EXITED); - thread->m_critsect.Leave(); + bWasCancelled = pThread->m_internal->GetState() == STATE_CANCELED; + pThread->m_internal->SetState(STATE_EXITED); + pThread->m_critsect.Leave(); + } pThread->OnExit(); // if the thread was cancelled (from Delete()), then it the handle is still @@ -368,39 +438,39 @@ ULONG wxThreadInternal::OS2ThreadStart( if (pThread->IsDetached() && !bWasCancelled) { // auto delete - delete thread; + delete pThread; } //else: the joinable threads handle will be closed when Wait() is done - return dwRet; + return; } void wxThreadInternal::SetPriority( unsigned int nPriority ) { - // translate wxWindows priority to the PM one - ULONG ulOS2_Priority; + // translate wxWidgets priority to the PM one + ULONG ulOS2_PriorityClass; + ULONG ulOS2_SubPriority; + ULONG ulrc; m_nPriority = nPriority; - - if (m_nPriority <= 20) - ulOS2_Priority = PRTYC_NOCHANGE; - else if (m_nPriority <= 40) - ulOS2_Priority = PRTYC_IDLETIME; - else if (m_nPriority <= 60) - ulOS2_Priority = PRTYC_REGULAR; - else if (m_nPriority <= 80) - ulOS2_Priority = PRTYC_TIMECRITICAL; + if (m_nPriority <= 25) + ulOS2_PriorityClass = PRTYC_IDLETIME; + else if (m_nPriority <= 50) + ulOS2_PriorityClass = PRTYC_REGULAR; + else if (m_nPriority <= 75) + ulOS2_PriorityClass = PRTYC_TIMECRITICAL; else if (m_nPriority <= 100) - ulOS2_Priority = PRTYC_FOREGROUNDSERVER; + ulOS2_PriorityClass = PRTYC_FOREGROUNDSERVER; else { wxFAIL_MSG(wxT("invalid value of thread priority parameter")); - ulOS2_Priority = PRTYC_REGULAR; + ulOS2_PriorityClass = PRTYC_REGULAR; } + ulOS2_SubPriority = (ULONG) (((m_nPriority - 1) % 25 + 1) * 31.0 / 25); ulrc = ::DosSetPriority( PRTYS_THREAD - ,ulOS2_Priority - ,0 + ,ulOS2_PriorityClass + ,ulOS2_SubPriority ,(ULONG)m_hThread ); if (ulrc != 0) @@ -409,55 +479,65 @@ void wxThreadInternal::SetPriority( } } -bool wxThreadInternal::Create( - wxThread* pThread -) +bool wxThreadInternal::Create( wxThread* pThread, + unsigned int uStackSize) { - APIRET ulrc; + int tid; + + if (!uStackSize) + uStackSize = 131072; - ulrc = ::DosCreateThread( &m_hThread - ,(PFNTHREAD)wxThreadInternal::OS2ThreadStart - ,(ULONG)pThread - ,CREATE_SUSPENDED | STACK_SPARSE - ,8192L - ); - if(ulrc != 0) + pThread->m_critsect.Enter(); + tid = _beginthread(wxThreadInternal::OS2ThreadStart, + NULL, uStackSize, pThread); + if(tid == -1) { wxLogSysError(_("Can't create thread")); - return FALSE; + return false; } - if (m_nPriority != WXTHREAD_DEFAULT_PRIORITY) + m_hThread = tid; + if (m_nPriority != wxPRIORITY_DEFAULT) { SetPriority(m_nPriority); } - return(TRUE); + + return true; } bool wxThreadInternal::Suspend() { - ULONG ulrc = ::DosSuspendThread(m_hThread); + ULONG ulrc = ::DosSuspendThread(m_hThread); if (ulrc != 0) { - wxLogSysError(_("Can not suspend thread %lu"), m_hThread); - return FALSE; + wxLogSysError(_("Cannot suspend thread %lu"), m_hThread); + return false; } m_eState = STATE_PAUSED; - return TRUE; + + return true; } bool wxThreadInternal::Resume() { - ULONG ulrc = ::DosResumeThread(m_hThread); + ULONG ulrc = ::DosResumeThread(m_hThread); if (ulrc != 0) { - wxLogSysError(_("Can not suspend thread %lu"), m_hThread); - return FALSE; + wxLogSysError(_("Cannot resume thread %lu"), m_hThread); + return false; } - m_eState = STATE_PAUSED; - return TRUE; + + // 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 + if ( m_eState != STATE_EXITED ) + { + m_eState = STATE_RUNNING; + } + + return true; } // static functions @@ -469,18 +549,6 @@ wxThread *wxThread::This() return pThread; } -bool wxThread::IsMain() -{ - PTIB ptib; - PPIB ppib; - - ::DosGetInfoBlocks(&ptib, &ppib); - - if (ptib->tib_ptib2->tib2_ultid == s_ulIdMainThread) - return TRUE; - return FALSE; -} - #ifdef Yield #undef Yield #endif @@ -490,11 +558,38 @@ void wxThread::Yield() ::DosSleep(0); } -void wxThread::Sleep( - unsigned long ulMilliseconds -) +int wxThread::GetCPUCount() +{ + ULONG CPUCount; + APIRET ulrc; + ulrc = ::DosQuerySysInfo(26, 26, (void *)&CPUCount, sizeof(ULONG)); + // QSV_NUMPROCESSORS(26) is typically not defined in header files + + if (ulrc != 0) + CPUCount = 1; + + return CPUCount; +} + +wxThreadIdType wxThread::GetCurrentId() +{ + PTIB ptib; + PPIB ppib; + + ::DosGetInfoBlocks(&ptib, &ppib); + return (wxThreadIdType) ptib->tib_ptib2->tib2_ultid; +} + +bool wxThread::SetConcurrency(size_t level) { - ::DosSleep(ulMilliseconds); + wxASSERT_MSG( IsMain(), wxT("should only be called from the main thread") ); + + // ok only for the default one + if ( level == 0 ) + return 0; + + // Don't know how to realize this on OS/2. + return level == 1; } // ctor and dtor @@ -515,9 +610,13 @@ wxThread::~wxThread() // create/start thread // ------------------- -wxThreadError wxThread::Create() +wxThreadError wxThread::Create( + unsigned int uStackSize +) { - if ( !m_internal->Create(this) ) + wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); + + if ( !m_internal->Create(this, uStackSize) ) return wxTHREAD_NO_RESOURCE; return wxTHREAD_NO_ERROR; @@ -527,6 +626,14 @@ wxThreadError wxThread::Run() { wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); + // Create the thread if it wasn't created yet with an explicit + // Create() call: + if ( !m_internal->GetHandle() ) + { + if ( !m_internal->Create(this, 0) ) + return wxTHREAD_NO_RESOURCE; + } + if ( m_internal->GetState() != STATE_NEW ) { // actually, it may be almost any state at all, not only STATE_RUNNING @@ -547,6 +654,13 @@ wxThreadError wxThread::Pause() wxThreadError wxThread::Resume() { + if (m_internal->GetState() == STATE_NEW) + { + m_internal->SetState(STATE_RUNNING); + m_critsect.Leave(); + return wxTHREAD_NO_ERROR; + } + wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); return m_internal->Resume() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR; @@ -555,80 +669,170 @@ wxThreadError wxThread::Resume() // stopping thread // --------------- -wxThread::ExitCode wxThread::Wait() +wxThread::ExitCode wxThread::Wait(wxThreadWait waitMode) { // 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") ); + wxT("can't wait for detached thread") ); ExitCode rc = (ExitCode)-1; - (void)Delete(&rc); - m_internal->Free(); + (void)Delete(&rc, waitMode); return(rc); } -wxThreadError wxThread::Delete(ExitCode *pRc) +wxThreadError wxThread::Delete(ExitCode *pRc, wxThreadWait WXUNUSED(waitMode)) { ExitCode rc = 0; // Delete() is always safe to call, so consider all possible states - if (IsPaused()) + + // 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((wxCriticalSection &)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(); - TID hThread = m_internal->GetHandle(); + TID hThread = m_internal->GetHandle(); - if (IsRunning()) + if ( isRunning || IsRunning()) { if (IsMain()) { // set flag for wxIsWaitingForThread() - gs_waitingForThread = TRUE; - -#if wxUSE_GUI - wxBeginBusyCursor(); -#endif // wxUSE_GUI + gs_bWaitingForThread = true; } // ask the thread to terminate + if ( shouldCancel ) { wxCriticalSectionLocker lock(m_critsect); + m_internal->Cancel(); } -#if wxUSE_GUI - // need a way to finish GUI processing before killing the thread - // until then we just exit - - if ((gs_nWaitingForGui > 0) && wxGuiOwnedByMainThread()) +#if 0 + // 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 + DWORD result = 0; // suppress warnings from broken compilers + do { - wxMutexGuiLeave(); - } -#else // !wxUSE_GUI + 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(); + } + } - // can't wait for yourself to end under OS/2 so just quit + result = ::DosWaitThread(&hThread, DCWW_NOWAIT); + // FIXME: We ought to have a message processing loop here!! + switch ( result ) + { + case ERROR_INTERRUPT: + case ERROR_THREAD_NOT_TERMINATED: + break; + case ERROR_INVALID_THREADID: + case NO_ERROR: + // thread we're waiting for just terminated + // or even does not exist any more. + result = NO_ERROR; + break; + default: + wxFAIL_MSG(wxT("unexpected result of DosWaitThread")); + } + if ( IsMain() ) + { + // event processing - needed if we are the main thread + // to give other threads a chance to do remaining GUI + // processing and terminate cleanly. + wxTheApp->HandleSockets(); + if (wxTheApp->Pending()) + if ( !wxTheApp->DoMessage() ) + { + // WM_QUIT received: kill the thread + Kill(); + + return wxTHREAD_KILLED; + } + else + wxUsleep(10); + } + else + wxUsleep(10); + } while ( result != NO_ERROR ); +#else // !wxUSE_GUI + // simply wait for the thread to terminate + // + // OTOH, even console apps create windows (in wxExecute, for WinSock + // &c), so may be use MsgWaitForMultipleObject() too here? + if ( ::DosWaitThread(&hThread, DCWW_WAIT) != NO_ERROR ) + { + wxFAIL_MSG(wxT("unexpected result of DosWaitThread")); + } #endif // wxUSE_GUI/!wxUSE_GUI if ( IsMain() ) { - gs_waitingForThread = FALSE; - -#if wxUSE_GUI - wxEndBusyCursor(); -#endif // wxUSE_GUI + gs_bWaitingForThread = false; } } - ::DosExit(0, 0); - // probably won't get this far, but - if (IsDetached()) +#if 0 + // 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 ); +#endif + + 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; } - wxASSERT_MSG( (DWORD)rc != STILL_ACTIVE, - wxT("thread must be already terminated.") ); - if ( pRc ) *pRc = rc; @@ -641,7 +845,6 @@ wxThreadError wxThread::Kill() return wxTHREAD_NOT_RUNNING; ::DosKillThread(m_internal->GetHandle()); - m_internal->Free(); if (IsDetached()) { delete this; @@ -649,13 +852,10 @@ wxThreadError wxThread::Kill() return wxTHREAD_NO_ERROR; } -void wxThread::Exit( - ExitCode pStatus -) +void wxThread::Exit(ExitCode WXUNUSED(pStatus)) { - m_internal->Free(); delete this; - ::DosExit(EXIT_THREAD, ULONG(pStatus)); + _endthread(); wxFAIL_MSG(wxT("Couldn't return from DosExit()!")); } @@ -729,61 +929,90 @@ IMPLEMENT_DYNAMIC_CLASS(wxThreadModule, wxModule) bool wxThreadModule::OnInit() { - s_pCritsectWaitingForGui = new wxCriticalSection(); + gs_pCritsectWaitingForGui = new wxCriticalSection(); - s_pCritsectGui = new wxCriticalSection(); - s_pCritsectGui->Enter(); + gs_pCritsectGui = new wxCriticalSection(); + gs_pCritsectGui->Enter(); - PTIB ptib; - PPIB ppib; + wxThread::ms_idMainThread = wxThread::GetCurrentId(); - ::DosGetInfoBlocks(&ptib, &ppib); - - s_ulIdMainThread = ptib->tib_ptib2->tib2_ultid; - return TRUE; + return true; } void wxThreadModule::OnExit() { - if (s_pCritsectGui) + if (gs_pCritsectGui) { - s_pCritsectGui->Leave(); - delete s_pCritsectGui; - s_pCritsectGui = NULL; + gs_pCritsectGui->Leave(); +#if (!(defined(__VISAGECPP__) && (__IBMCPP__ < 400 || __IBMC__ < 400 ))) + delete gs_pCritsectGui; +#endif + gs_pCritsectGui = NULL; } - wxDELETE(s_pCritsectWaitingForGui); +#if (!(defined(__VISAGECPP__) && (__IBMCPP__ < 400 || __IBMC__ < 400 ))) + wxDELETE(gs_pCritsectWaitingForGui); +#endif } // ---------------------------------------------------------------------------- // Helper functions // ---------------------------------------------------------------------------- -// Does nothing under OS/2 [for now] +// wake up the main thread if it's in ::GetMessage() void WXDLLEXPORT wxWakeUpMainThread() { +#if 0 + if ( !::WinPostQueueMsg(wxTheApp->m_hMq, WM_NULL, 0, 0) ) + { + // should never happen + wxLogLastError(wxT("WinPostMessage(WM_NULL)")); + } +#endif } -void WXDLLEXPORT wxMutexGuiLeave() +void wxMutexGuiEnterImpl() { - wxCriticalSectionLocker enter(*s_pCritsectWaitingForGui); + // this would dead lock everything... + wxASSERT_MSG( !wxThread::IsMain(), + wxT("main thread doesn't want to block in wxMutexGuiEnter()!") ); + + // the order in which we enter the critical sections here is crucial!! + + // set the flag telling to the main thread that we want to do some GUI + { + wxCriticalSectionLocker enter(*gs_pCritsectWaitingForGui); + + gs_nWaitingForGui++; + } + + wxWakeUpMainThread(); + + // now we may block here because the main thread will soon let us in + // (during the next iteration of OnIdle()) + gs_pCritsectGui->Enter(); +} + +void wxMutexGuiLeaveImpl() +{ + wxCriticalSectionLocker enter(*gs_pCritsectWaitingForGui); if ( wxThread::IsMain() ) { - s_bGuiOwnedByMainThread = FALSE; + gs_bGuiOwnedByMainThread = false; } else { // decrement the number of waiters now - wxASSERT_MSG( s_nWaitingForGui > 0, + wxASSERT_MSG(gs_nWaitingForGui > 0, wxT("calling wxMutexGuiLeave() without entering it first?") ); - s_nWaitingForGui--; + gs_nWaitingForGui--; wxWakeUpMainThread(); } - s_pCritsectGui->Leave(); + gs_pCritsectGui->Leave(); } void WXDLLEXPORT wxMutexGuiLeaveOrEnter() @@ -791,17 +1020,17 @@ void WXDLLEXPORT wxMutexGuiLeaveOrEnter() wxASSERT_MSG( wxThread::IsMain(), wxT("only main thread may call wxMutexGuiLeaveOrEnter()!") ); - wxCriticalSectionLocker enter(*s_pCritsectWaitingForGui); + wxCriticalSectionLocker enter(*gs_pCritsectWaitingForGui); - if ( s_nWaitingForGui == 0 ) + if (gs_nWaitingForGui == 0) { // no threads are waiting for GUI - so we may acquire the lock without // any danger (but only if we don't already have it) if (!wxGuiOwnedByMainThread()) { - s_pCritsectGui->Enter(); + gs_pCritsectGui->Enter(); - s_bGuiOwnedByMainThread = TRUE; + gs_bGuiOwnedByMainThread = true; } //else: already have it, nothing to do } @@ -818,13 +1047,19 @@ void WXDLLEXPORT wxMutexGuiLeaveOrEnter() bool WXDLLEXPORT wxGuiOwnedByMainThread() { - return s_bGuiOwnedByMainThread; + return gs_bGuiOwnedByMainThread; } bool WXDLLEXPORT wxIsWaitingForThread() { - return s_bWaitingForThread; + return gs_bWaitingForThread; } +// ---------------------------------------------------------------------------- +// include common implementation code +// ---------------------------------------------------------------------------- + +#include "wx/thrimpl.cpp" + #endif // wxUSE_THREADS