X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/19da43267e410c8acdd57a31d89b6c5ecce8c36f..a3e7d24d21f5371c88caffe4a85c8e4a5362db3f:/src/unix/threadpsx.cpp?ds=sidebyside diff --git a/src/unix/threadpsx.cpp b/src/unix/threadpsx.cpp index d7dac9c864..8fc3c664e1 100644 --- a/src/unix/threadpsx.cpp +++ b/src/unix/threadpsx.cpp @@ -47,10 +47,6 @@ #include #endif -#ifdef __WXGTK12__ -#include "gtk/gtk.h" -#endif - // ---------------------------------------------------------------------------- // constants // ---------------------------------------------------------------------------- @@ -85,10 +81,8 @@ static pthread_t gs_tidMain; // the key for the pointer to the associated wxThread object static pthread_key_t gs_keySelf; -#ifndef __WXGTK12__ // this mutex must be acquired before any call to a GUI function static wxMutex *gs_mutexGui; -#endif // ============================================================================ // implementation @@ -107,6 +101,7 @@ public: wxMutex::wxMutex() { p_internal = new wxMutexInternal; + pthread_mutex_init( &(p_internal->p_mutex), (const pthread_mutexattr_t*) NULL ); m_locked = 0; } @@ -114,7 +109,7 @@ wxMutex::wxMutex() wxMutex::~wxMutex() { if (m_locked > 0) - wxLogDebug(_T("Freeing a locked mutex (%d locks)"), m_locked); + wxLogDebug(wxT("Freeing a locked mutex (%d locks)"), m_locked); pthread_mutex_destroy( &(p_internal->p_mutex) ); delete p_internal; @@ -125,7 +120,7 @@ wxMutexError wxMutex::Lock() int err = pthread_mutex_lock( &(p_internal->p_mutex) ); if (err == EDEADLK) { - wxLogDebug(_T("Locking this mutex would lead to deadlock!")); + wxLogDebug(wxT("Locking this mutex would lead to deadlock!")); return wxMUTEX_DEAD_LOCK; } @@ -161,7 +156,7 @@ wxMutexError wxMutex::Unlock() } else { - wxLogDebug(_T("Unlocking not locked mutex.")); + wxLogDebug(wxT("Unlocking not locked mutex.")); return wxMUTEX_UNLOCKED; } @@ -231,6 +226,11 @@ public: // thread entry function static void *PthreadStart(void *ptr); +#if HAVE_THREAD_CLEANUP_FUNCTIONS + // thread exit function + static void PthreadCleanup(void *ptr); +#endif + // thread actions // start the thread wxThreadError Run(); @@ -272,7 +272,9 @@ private: // state // 2. The Delete() function blocks until the condition is signaled when the // thread exits. - wxMutex m_mutex; + // GL: On Linux, this may fail because we can have a deadlock in either + // SignalExit() or Wait(): so we add m_end_mutex for the finalization. + wxMutex m_mutex, m_end_mutex; wxCondition m_cond; // another (mutex, cond) pair for Pause()/Resume() usage @@ -289,6 +291,7 @@ void *wxThreadInternal::PthreadStart(void *ptr) { wxThread *thread = (wxThread *)ptr; wxThreadInternal *pthread = thread->p_internal; + void *status; int rc = pthread_setspecific(gs_keySelf, thread); if ( rc != 0 ) @@ -297,32 +300,68 @@ void *wxThreadInternal::PthreadStart(void *ptr) return (void *)-1; } +#if HAVE_THREAD_CLEANUP_FUNCTIONS + // Install the cleanup handler. + pthread_cleanup_push(wxThreadInternal::PthreadCleanup, ptr); +#endif // wait for the condition to be signaled from Run() // mutex state: currently locked by the thread which created us pthread->m_cond.Wait(pthread->m_mutex); - // mutex state: locked again on exit of Wait() // call the main entry - void* status = thread->Entry(); + status = thread->Entry(); + +#if HAVE_THREAD_CLEANUP_FUNCTIONS + pthread_cleanup_pop(FALSE); +#endif // terminate the thread thread->Exit(status); - wxFAIL_MSG(_T("wxThread::Exit() can't return.")); + wxFAIL_MSG(wxT("wxThread::Exit() can't return.")); return NULL; } +#if HAVE_THREAD_CLEANUP_FUNCTIONS +// Only called when the thread is explicitely killed. + +void wxThreadInternal::PthreadCleanup(void *ptr) +{ + wxThread *thread = (wxThread *) ptr; + + // The thread is already considered as finished. + if (thread->p_internal->GetState() == STATE_EXITED) + return; + + // first call user-level clean up code + thread->OnExit(); + + // next wake up the threads waiting for us (OTOH, this function won't retur + // until someone waited for us!) + thread->p_internal->SetState(STATE_EXITED); + + thread->p_internal->SignalExit(); +} +#endif + wxThreadInternal::wxThreadInternal() { m_state = STATE_NEW; m_cancelled = FALSE; + m_prio = WXTHREAD_DEFAULT_PRIORITY; + m_threadId = 0; // this mutex is locked during almost all thread lifetime - it will only be // unlocked in the very end m_mutex.Lock(); + + // this mutex is used by wxThreadInternal::Wait() and by + // wxThreadInternal::SignalExit(). We don't use m_mutex because of a + // possible deadlock in either Wait() or SignalExit(). + m_end_mutex.Lock(); // this mutex is used in Pause()/Resume() and is also locked all the time // unless the thread is paused @@ -336,12 +375,23 @@ wxThreadInternal::~wxThreadInternal() // note that m_mutex will be unlocked by the thread which waits for our // termination + + // In the case, we didn't start the thread, all these mutex are locked: + // we must unlock them. + if (m_mutex.IsLocked()) + m_mutex.Unlock(); + + if (m_end_mutex.IsLocked()) + m_end_mutex.Unlock(); + + if (m_mutexSuspend.IsLocked()) + m_mutexSuspend.Unlock(); } wxThreadError wxThreadInternal::Run() { wxCHECK_MSG( GetState() == STATE_NEW, wxTHREAD_RUNNING, - _T("thread may only be started once after successful Create()") ); + wxT("thread may only be started once after successful Create()") ); // the mutex was locked on Create(), so we will be able to lock it again // only when the thread really starts executing and enters the wait - @@ -360,7 +410,7 @@ wxThreadError wxThreadInternal::Run() void wxThreadInternal::Wait() { - wxCHECK_RET( WasCancelled(), _T("thread should have been cancelled first") ); + wxCHECK_RET( WasCancelled(), wxT("thread should have been cancelled first") ); // if the thread we're waiting for is waiting for the GUI mutex, we will // deadlock so make sure we release it temporarily @@ -369,11 +419,14 @@ void wxThreadInternal::Wait() // entering Wait() releases the mutex thus allowing SignalExit() to acquire // it and to signal us its termination - m_cond.Wait(m_mutex); + m_cond.Wait(m_end_mutex); // mutex is still in the locked state - relocked on exit from Wait(), so // unlock it - we don't need it any more, the thread has already terminated - m_mutex.Unlock(); + m_end_mutex.Unlock(); + + // After that, we wait for the real end of the other thread. + pthread_join(GetId(), NULL); // reacquire GUI mutex if ( wxThread::IsMain() ) @@ -387,13 +440,13 @@ void wxThreadInternal::SignalExit() // as mutex is currently locked, this will block until some other thread // (normally the same which created this one) unlocks it by entering Wait() - m_mutex.Lock(); + m_end_mutex.Lock(); // wake up all the threads waiting for our termination m_cond.Broadcast(); // after this call mutex will be finally unlocked - m_mutex.Unlock(); + m_end_mutex.Unlock(); } void wxThreadInternal::Pause() @@ -401,7 +454,7 @@ void wxThreadInternal::Pause() // the state is set from the thread which pauses us first, this function // is called later so the state should have been already set wxCHECK_RET( m_state == STATE_PAUSED, - _T("thread must first be paused with wxThread::Pause().") ); + wxT("thread must first be paused with wxThread::Pause().") ); // don't pause the thread which is being terminated - this would lead to // deadlock if the thread is paused after Delete() had called Resume() but @@ -416,7 +469,7 @@ void wxThreadInternal::Pause() void wxThreadInternal::Resume() { wxCHECK_RET( m_state == STATE_PAUSED, - _T("can't resume thread which is not suspended.") ); + wxT("can't resume thread which is not suspended.") ); // we will be able to lock this mutex only when Pause() starts waiting wxMutexLocker lock(m_mutexSuspend); @@ -485,6 +538,17 @@ wxThreadError wxThread::Create() wxLogError(_("Cannot get priority range for scheduling policy %d."), prio); } + else if ( max_prio == min_prio ) + { + if ( p_internal->GetPriority() != WXTHREAD_DEFAULT_PRIORITY ) + { + // notify the programmer that this doesn't work here + wxLogWarning(_("Thread priority setting is ignored.")); + } + //else: we have default priority, so don't complain + + // anyhow, don't do anything because priority is just ignored + } else { struct sched_param sp; @@ -516,6 +580,9 @@ wxThreadError wxThread::Create() wxThreadError wxThread::Run() { + wxCHECK_MSG( p_internal->GetId(), wxTHREAD_MISC_ERROR, + wxT("must call wxThread::Create() first") ); + return p_internal->Run(); } @@ -527,7 +594,7 @@ void wxThread::SetPriority(unsigned int prio) { wxCHECK_RET( ((int)WXTHREAD_MIN_PRIORITY <= (int)prio) && ((int)prio <= (int)WXTHREAD_MAX_PRIORITY), - _T("invalid thread priority") ); + wxT("invalid thread priority") ); wxCriticalSectionLocker lock(m_critsect); @@ -556,7 +623,7 @@ void wxThread::SetPriority(unsigned int prio) case STATE_EXITED: default: - wxFAIL_MSG(_T("impossible to set thread priority in this state")); + wxFAIL_MSG(wxT("impossible to set thread priority in this state")); } } @@ -582,7 +649,7 @@ wxThreadError wxThread::Pause() if ( p_internal->GetState() != STATE_RUNNING ) { - wxLogDebug(_T("Can't pause thread which is not running.")); + wxLogDebug(wxT("Can't pause thread which is not running.")); return wxTHREAD_NOT_RUNNING; } @@ -606,7 +673,7 @@ wxThreadError wxThread::Resume() } else { - wxLogDebug(_T("Attempt to resume a thread which is not paused.")); + wxLogDebug(wxT("Attempt to resume a thread which is not paused.")); return wxTHREAD_MISC_ERROR; } @@ -618,13 +685,17 @@ wxThreadError wxThread::Resume() wxThread::ExitCode wxThread::Delete() { + if (IsPaused()) + Resume(); + m_critsect.Enter(); wxThreadState state = p_internal->GetState(); - m_critsect.Leave(); // ask the thread to stop p_internal->SetCancelFlag(); + m_critsect.Leave(); + switch ( state ) { case STATE_NEW: @@ -642,6 +713,8 @@ wxThread::ExitCode wxThread::Delete() // wait until the thread stops p_internal->Wait(); } + //GL: As we must auto-destroy, the destruction must happen here. + delete this; return NULL; } @@ -663,6 +736,8 @@ wxThreadError wxThread::Kill() return wxTHREAD_MISC_ERROR; } + //GL: As we must auto-destroy, the destruction must happen here (2). + delete this; return wxTHREAD_NO_ERROR; } @@ -707,6 +782,18 @@ bool wxThread::TestDestroy() wxThread::~wxThread() { + m_critsect.Enter(); + if ( p_internal->GetState() != STATE_EXITED && + p_internal->GetState() != STATE_NEW ) + { + wxLogDebug(wxT("The thread is being destroyed although it is still " + "running! The application may crash.")); + } + + m_critsect.Leave(); + + delete p_internal; + // remove this thread from the global array gs_allThreads.Remove(this); } @@ -771,39 +858,35 @@ bool wxThreadModule::OnInit() return FALSE; } -#ifndef __WXGTK12__ gs_mutexGui = new wxMutex(); -#endif gs_tidMain = pthread_self(); -#ifndef __WXGTK12__ gs_mutexGui->Lock(); -#endif return TRUE; } void wxThreadModule::OnExit() { - wxASSERT_MSG( wxThread::IsMain(), _T("only main thread can be here") ); + wxASSERT_MSG( wxThread::IsMain(), wxT("only main thread can be here") ); // terminate any threads left size_t count = gs_allThreads.GetCount(); if ( count != 0u ) - wxLogDebug(_T("Some threads were not terminated by the application.")); + wxLogDebug(wxT("Some threads were not terminated by the application.")); for ( size_t n = 0u; n < count; n++ ) { - gs_allThreads[n]->Delete(); + // Delete calls the destructor which removes the current entry. We + // should only delete the first one each time. + gs_allThreads[0]->Delete(); } -#ifndef __WXGTK12__ // destroy GUI mutex gs_mutexGui->Unlock(); delete gs_mutexGui; -#endif // and free TLD slot (void)pthread_key_delete(gs_keySelf); @@ -815,20 +898,12 @@ void wxThreadModule::OnExit() void wxMutexGuiEnter() { -#ifdef __WXGTK12__ - gdk_threads_enter(); -#else gs_mutexGui->Lock(); -#endif } void wxMutexGuiLeave() { -#ifdef __WXGTK12__ - gdk_threads_leave(); -#else gs_mutexGui->Unlock(); -#endif } #endif