X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/cd10339a234dd916a1c1f544ea1f364a8d3df3ae..907173e51df6d2a91d65463ddf6ce810d3fd921a:/src/unix/threadpsx.cpp diff --git a/src/unix/threadpsx.cpp b/src/unix/threadpsx.cpp index 48beb9ca6c..3da088548d 100644 --- a/src/unix/threadpsx.cpp +++ b/src/unix/threadpsx.cpp @@ -21,11 +21,12 @@ // headers // ---------------------------------------------------------------------------- -#ifdef __GNUG__ +#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA) #pragma implementation "thread.h" #endif -#include "wx/defs.h" +// for compilers that support precompilation, includes "wx.h". +#include "wx/wxprec.h" #if wxUSE_THREADS @@ -53,6 +54,15 @@ // we use wxFFile under Linux in GetCPUCount() #ifdef __LINUX__ #include "wx/ffile.h" + // For setpriority. + #include + #include +#endif + +#ifdef __VMS + #define THR_ID(thr) ((long long)(thr)->GetId()) +#else + #define THR_ID(thr) ((long)(thr)->GetId()) #endif // ---------------------------------------------------------------------------- @@ -71,9 +81,12 @@ enum wxThreadState // the exit value of a thread which has been cancelled static const wxThread::ExitCode EXITCODE_CANCELLED = (wxThread::ExitCode)-1; -// our trace mask +// trace mask for wxThread operations #define TRACE_THREADS _T("thread") +// you can get additional debugging messages for the semaphore operations +#define TRACE_SEMA _T("semaphore") + // ---------------------------------------------------------------------------- // private functions // ---------------------------------------------------------------------------- @@ -82,11 +95,14 @@ static void ScheduleThreadForDeletion(); static void DeleteThread(wxThread *This); // ---------------------------------------------------------------------------- -// types +// private classes // ---------------------------------------------------------------------------- +// an (non owning) array of pointers to threads WX_DEFINE_ARRAY(wxThread *, wxArrayThread); +// an entry for a thread we can wait for + // ----------------------------------------------------------------------------- // global data // ----------------------------------------------------------------------------- @@ -97,7 +113,7 @@ WX_DEFINE_ARRAY(wxThread *, wxArrayThread); static wxArrayThread gs_allThreads; // the id of the main thread -static pthread_t gs_tidMain; +static pthread_t gs_tidMain = (pthread_t)-1; // the key for the pointer to the associated wxThread object static pthread_key_t gs_keySelf; @@ -113,10 +129,19 @@ static wxMutex *gs_mutexDeleteThread = (wxMutex *)NULL; // gs_nThreadsBeingDeleted will have been deleted static wxCondition *gs_condAllDeleted = (wxCondition *)NULL; -#if wxUSE_GUI - // this mutex must be acquired before any call to a GUI function - static wxMutex *gs_mutexGui; -#endif // wxUSE_GUI +// this mutex must be acquired before any call to a GUI function +// (it's not inside #if wxUSE_GUI because this file is compiled as part +// of wxBase) +static wxMutex *gs_mutexGui = NULL; + +// when we wait for a thread to exit, we're blocking on a condition which the +// thread signals in its SignalExit() method -- but this condition can't be a +// member of the thread itself as a detached thread may delete itself at any +// moment and accessing the condition member of the thread after this would +// result in a disaster +// +// so instead we maintain a global list of the structs below for the threads +// we're interested in waiting on // ============================================================================ // wxMutex implementation @@ -126,51 +151,92 @@ static wxCondition *gs_condAllDeleted = (wxCondition *)NULL; // wxMutexInternal // ---------------------------------------------------------------------------- +// this is a simple wrapper around pthread_mutex_t which provides error +// checking class wxMutexInternal { public: - wxMutexInternal(); + wxMutexInternal(wxMutexType mutexType); ~wxMutexInternal(); wxMutexError Lock(); wxMutexError TryLock(); wxMutexError Unlock(); + bool IsOk() const { return m_isOk; } + private: pthread_mutex_t m_mutex; + bool m_isOk; + // wxConditionInternal uses our m_mutex friend class wxConditionInternal; }; -wxMutexInternal::wxMutexInternal() +#ifdef HAVE_PTHREAD_MUTEXATTR_T +// on some systems pthread_mutexattr_settype() is not in the headers (but it is +// in the library, otherwise we wouldn't compile this code at all) +extern "C" int pthread_mutexattr_settype(pthread_mutexattr_t *, int); +#endif + +wxMutexInternal::wxMutexInternal(wxMutexType mutexType) { - // support recursive locks like Win32, i.e. a thread can lock a mutex which - // it had itself already locked - // - // but initialization of recursive mutexes is non portable , so try - // several methods + int err; + switch ( mutexType ) + { + case wxMUTEX_RECURSIVE: + // support recursive locks like Win32, i.e. a thread can lock a + // mutex which it had itself already locked + // + // unfortunately initialization of recursive mutexes is non + // portable, so try several methods #ifdef HAVE_PTHREAD_MUTEXATTR_T - pthread_mutexattr_t attr; - pthread_mutexattr_init(&attr); - pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE); + { + pthread_mutexattr_t attr; + pthread_mutexattr_init(&attr); + pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE); - pthread_mutex_init(&m_mutex, &attr); + err = pthread_mutex_init(&m_mutex, &attr); + } #elif defined(HAVE_PTHREAD_RECURSIVE_MUTEX_INITIALIZER) - // we can use this only as initializer so we have to assign it first to a - // temp var - assigning directly to m_mutex wouldn't even compile - pthread_mutex_t mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP; - m_mutex = mutex; + // we can use this only as initializer so we have to assign it + // first to a temp var - assigning directly to m_mutex wouldn't + // even compile + { + pthread_mutex_t mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP; + m_mutex = mutex; + } #else // no recursive mutexes - pthread_mutex_init(&m_mutex, NULL); - - // used by TryLock() below - #define NO_RECURSIVE_MUTEXES + err = EINVAL; #endif // HAVE_PTHREAD_MUTEXATTR_T/... + break; + + default: + wxFAIL_MSG( _T("unknown mutex type") ); + // fall through + + case wxMUTEX_DEFAULT: + err = pthread_mutex_init(&m_mutex, NULL); + break; + } + + m_isOk = err == 0; + if ( !m_isOk ) + { + wxLogApiError( wxT("pthread_mutex_init()"), err); + } } wxMutexInternal::~wxMutexInternal() { - pthread_mutex_destroy(&m_mutex); + if ( m_isOk ) + { + int err = pthread_mutex_destroy(&m_mutex); + if ( err != 0 ) + { + wxLogApiError( wxT("pthread_mutex_destroy()"), err); + } + } } wxMutexError wxMutexInternal::Lock() @@ -179,20 +245,23 @@ wxMutexError wxMutexInternal::Lock() switch ( err ) { case EDEADLK: - wxLogDebug(wxT("Locking this mutex would lead to deadlock!")); + // only error checking mutexes return this value and so it's an + // unexpected situation -- hence use assert, not wxLogDebug + wxFAIL_MSG( _T("mutex deadlock prevented") ); return wxMUTEX_DEAD_LOCK; - default: - wxFAIL_MSG( _T("unexpected pthread_mutex_lock() return") ); - // fall through - case EINVAL: - wxLogDebug(_T("Failed to lock the mutex.")); - return wxMUTEX_MISC_ERROR; + wxLogDebug(_T("pthread_mutex_lock(): mutex not initialized.")); + break; case 0: return wxMUTEX_NO_ERROR; + + default: + wxLogApiError(_T("pthread_mutex_lock()"), err); } + + return wxMUTEX_MISC_ERROR; } wxMutexError wxMutexInternal::TryLock() @@ -201,19 +270,22 @@ wxMutexError wxMutexInternal::TryLock() switch ( err ) { case EBUSY: + // not an error: mutex is already locked, but we're prepared for + // this return wxMUTEX_BUSY; - default: - wxFAIL_MSG( _T("unexpected pthread_mutex_trylock() return") ); - // fall through - case EINVAL: - wxLogDebug(_T("Failed to try to lock the mutex.")); - return wxMUTEX_MISC_ERROR; + wxLogDebug(_T("pthread_mutex_trylock(): mutex not initialized.")); + break; case 0: return wxMUTEX_NO_ERROR; + + default: + wxLogApiError(_T("pthread_mutex_trylock()"), err); } + + return wxMUTEX_MISC_ERROR; } wxMutexError wxMutexInternal::Unlock() @@ -225,87 +297,18 @@ wxMutexError wxMutexInternal::Unlock() // we don't own the mutex return wxMUTEX_UNLOCKED; - default: - wxFAIL_MSG( _T("unexpected pthread_mutex_unlock() return") ); - // fall through - case EINVAL: - wxLogDebug(_T("Failed to unlock the mutex.")); - return wxMUTEX_MISC_ERROR; + wxLogDebug(_T("pthread_mutex_unlock(): mutex not initialized.")); + break; case 0: return wxMUTEX_NO_ERROR; - } -} - -// ---------------------------------------------------------------------------- -// wxMutex -// ---------------------------------------------------------------------------- - -// TODO: this is completely generic, move it to common code? - -wxMutex::wxMutex() -{ - m_internal = new wxMutexInternal; - - m_locked = 0; -} - -wxMutex::~wxMutex() -{ - if ( m_locked > 0 ) - wxLogDebug(wxT("Freeing a locked mutex (%d locks)"), m_locked); - - delete m_internal; -} - -wxMutexError wxMutex::Lock() -{ - wxMutexError err = m_internal->Lock(); - - if ( !err ) - { - m_locked++; - } - - return err; -} - -wxMutexError wxMutex::TryLock() -{ - if ( m_locked ) - { -#ifdef NO_RECURSIVE_MUTEXES - return wxMUTEX_DEAD_LOCK; -#else // have recursive mutexes on this platform - // we will succeed in locking it when we have it already locked - return wxMUTEX_NO_ERROR; -#endif // recursive/non-recursive mutexes - } - - wxMutexError err = m_internal->TryLock(); - if ( !err ) - { - m_locked++; - } - - return err; -} - -wxMutexError wxMutex::Unlock() -{ - if ( m_locked > 0 ) - { - m_locked--; - } - else - { - wxLogDebug(wxT("Unlocking not locked mutex.")); - return wxMUTEX_UNLOCKED; + default: + wxLogApiError(_T("pthread_mutex_unlock()"), err); } - return m_internal->Unlock(); + return wxMUTEX_MISC_ERROR; } // =========================================================================== @@ -316,121 +319,77 @@ wxMutexError wxMutex::Unlock() // wxConditionInternal // --------------------------------------------------------------------------- +// this is a wrapper around pthread_cond_t associated with a wxMutex (and hence +// with a pthread_mutex_t) class wxConditionInternal { public: - wxConditionInternal( wxMutex *mutex ); + wxConditionInternal(wxMutex& mutex); ~wxConditionInternal(); - void Wait(); - - bool Wait( const timespec *ts ); + bool IsOk() const { return m_isOk && m_mutex.IsOk(); } - void Signal(); + wxCondError Wait(); + wxCondError WaitTimeout(unsigned long milliseconds); - void Broadcast(); + wxCondError Signal(); + wxCondError Broadcast(); private: + // get the POSIX mutex associated with us + pthread_mutex_t *GetPMutex() const { return &m_mutex.m_internal->m_mutex; } - wxMutex *m_mutex; + wxMutex& m_mutex; pthread_cond_t m_cond; + + bool m_isOk; }; -wxConditionInternal::wxConditionInternal( wxMutex *mutex ) +wxConditionInternal::wxConditionInternal(wxMutex& mutex) + : m_mutex(mutex) { - m_mutex = mutex; - if ( pthread_cond_init( &m_cond, NULL ) != 0 ) + int err = pthread_cond_init(&m_cond, NULL /* default attributes */); + + m_isOk = err == 0; + + if ( !m_isOk ) { - wxLogDebug(_T("pthread_cond_init() failed")); + wxLogApiError(_T("pthread_cond_init()"), err); } } wxConditionInternal::~wxConditionInternal() { - if ( pthread_cond_destroy( &m_cond ) != 0 ) + if ( m_isOk ) { - wxLogDebug(_T("pthread_cond_destroy() failed")); + int err = pthread_cond_destroy(&m_cond); + if ( err != 0 ) + { + wxLogApiError(_T("pthread_cond_destroy()"), err); + } } } -void wxConditionInternal::Wait() +wxCondError wxConditionInternal::Wait() { - if ( pthread_cond_wait( &m_cond, &(m_mutex->m_internal->m_mutex) ) != 0 ) + int err = pthread_cond_wait(&m_cond, GetPMutex()); + if ( err != 0 ) { - wxLogDebug(_T("pthread_cond_wait() failed")); - } -} - -bool wxConditionInternal::Wait( const timespec *ts ) -{ - int result = pthread_cond_timedwait( &m_cond, - &(m_mutex->m_internal->m_mutex), - ts ); - if ( result == ETIMEDOUT ) - return FALSE; + wxLogApiError(_T("pthread_cond_wait()"), err); - wxASSERT_MSG( result == 0, _T("pthread_cond_timedwait() failed") ); - - return TRUE; -} - -void wxConditionInternal::Signal() -{ - int result = pthread_cond_signal( &m_cond ); - if ( result != 0 ) -{ - wxFAIL_MSG( _T("pthread_cond_signal() failed") ); + return wxCOND_MISC_ERROR; } -} -void wxConditionInternal::Broadcast() -{ - int result = pthread_cond_broadcast( &m_cond ); - if ( result != 0 ) -{ - wxFAIL_MSG( _T("pthread_cond_broadcast() failed") ); - } + return wxCOND_NO_ERROR; } - -// --------------------------------------------------------------------------- -// wxCondition -// --------------------------------------------------------------------------- - -wxCondition::wxCondition( wxMutex *mutex ) +wxCondError wxConditionInternal::WaitTimeout(unsigned long milliseconds) { - if ( !mutex ) - { - wxFAIL_MSG( _T("NULL mutex in wxCondition ctor") ); - - m_internal = NULL; - } - else - { - m_internal = new wxConditionInternal( mutex ); - } -} - -wxCondition::~wxCondition() -{ - delete m_internal; -} - -void wxCondition::Wait() -{ - if ( m_internal ) - m_internal->Wait(); -} - -bool wxCondition::Wait( unsigned long timeout_millis ) -{ - wxCHECK_MSG( m_internal, FALSE, _T("can't wait on uninitalized condition") ); - wxLongLong curtime = wxGetLocalTimeMillis(); - curtime += timeout_millis; + curtime += milliseconds; wxLongLong temp = curtime / 1000; int sec = temp.GetLo(); - temp = temp * 1000; + temp *= 1000; temp = curtime - temp; int millis = temp.GetLo(); @@ -439,19 +398,46 @@ bool wxCondition::Wait( unsigned long timeout_millis ) tspec.tv_sec = sec; tspec.tv_nsec = millis * 1000L * 1000L; - return m_internal->Wait(&tspec); + int err = pthread_cond_timedwait( &m_cond, GetPMutex(), &tspec ); + switch ( err ) + { + case ETIMEDOUT: + return wxCOND_TIMEOUT; + + case 0: + return wxCOND_NO_ERROR; + + default: + wxLogApiError(_T("pthread_cond_timedwait()"), err); + } + + return wxCOND_MISC_ERROR; } -void wxCondition::Signal() +wxCondError wxConditionInternal::Signal() { - if ( m_internal ) - m_internal->Signal(); + int err = pthread_cond_signal(&m_cond); + if ( err != 0 ) + { + wxLogApiError(_T("pthread_cond_signal()"), err); + + return wxCOND_MISC_ERROR; + } + + return wxCOND_NO_ERROR; } -void wxCondition::Broadcast() +wxCondError wxConditionInternal::Broadcast() { - if ( m_internal ) - m_internal->Broadcast(); + int err = pthread_cond_broadcast(&m_cond); + if ( err != 0 ) + { + wxLogApiError(_T("pthread_cond_broadcast()"), err); + + return wxCOND_MISC_ERROR; + } + + return wxCOND_NO_ERROR; } // =========================================================================== @@ -462,221 +448,139 @@ void wxCondition::Broadcast() // wxSemaphoreInternal // --------------------------------------------------------------------------- +// we implement the semaphores using mutexes and conditions instead of using +// the sem_xxx() POSIX functions because they're not widely available and also +// because it's impossible to implement WaitTimeout() using them class wxSemaphoreInternal { public: - wxSemaphoreInternal( int initialcount, int maxcount ); + wxSemaphoreInternal(int initialcount, int maxcount); - void Wait(); - bool TryWait(); + bool IsOk() const { return m_isOk; } - bool Wait( unsigned long timeout_millis ); + wxSemaError Wait(); + wxSemaError TryWait(); + wxSemaError WaitTimeout(unsigned long milliseconds); - void Post(); + wxSemaError Post(); private: wxMutex m_mutex; wxCondition m_cond; - int count, - maxcount; + size_t m_count, + m_maxcount; + + bool m_isOk; }; -wxSemaphoreInternal::wxSemaphoreInternal( int initialcount, int maxcount ) - : m_cond(&m_mutex) +wxSemaphoreInternal::wxSemaphoreInternal(int initialcount, int maxcount) + : m_cond(m_mutex) { - if ( (initialcount < 0) || ((maxcount > 0) && (initialcount > maxcount)) ) + if ( (initialcount < 0 || maxcount < 0) || + ((maxcount > 0) && (initialcount > maxcount)) ) { - wxFAIL_MSG( _T("wxSemaphore: invalid initial count") ); - } + wxFAIL_MSG( _T("wxSemaphore: invalid initial or maximal count") ); - maxcount = maxcount; - count = initialcount; -} - -void wxSemaphoreInternal::Wait() -{ - wxMutexLocker locker(m_mutex); - - while ( count <= 0 ) - { - m_cond.Wait(); + m_isOk = FALSE; } - - count--; -} - -bool wxSemaphoreInternal::TryWait() -{ - wxMutexLocker locker(m_mutex); - - if ( count <= 0 ) - return FALSE; - - count--; - - return TRUE; -} - -bool wxSemaphoreInternal::Wait( unsigned long timeout_millis ) -{ - wxMutexLocker locker(m_mutex); - - wxLongLong startTime = wxGetLocalTimeMillis(); - - while ( count <= 0 ) + else { - wxLongLong elapsed = wxGetLocalTimeMillis() - startTime; - long remainingTime = (long)timeout_millis - (long)elapsed.GetLo(); - if ( remainingTime <= 0 ) - return FALSE; - - bool result = m_cond.Wait( remainingTime ); - if ( !result ) - return FALSE; + m_maxcount = (size_t)maxcount; + m_count = (size_t)initialcount; } - count--; - - return TRUE; + m_isOk = m_mutex.IsOk() && m_cond.IsOk(); } -void wxSemaphoreInternal::Post() +wxSemaError wxSemaphoreInternal::Wait() { wxMutexLocker locker(m_mutex); - if ( maxcount > 0 && count == maxcount ) + while ( m_count == 0 ) { - wxFAIL_MSG( _T("wxSemaphore::Post() overflow") ); - } + wxLogTrace(TRACE_SEMA, + _T("Thread %ld waiting for semaphore to become signalled"), + wxThread::GetCurrentId()); - count++; - - m_cond.Signal(); -} + if ( m_cond.Wait() != wxCOND_NO_ERROR ) + return wxSEMA_MISC_ERROR; -// -------------------------------------------------------------------------- -// wxSemaphore -// -------------------------------------------------------------------------- + wxLogTrace(TRACE_SEMA, + _T("Thread %ld finished waiting for semaphore, count = %lu"), + wxThread::GetCurrentId(), (unsigned long)m_count); + } -wxSemaphore::wxSemaphore( int initialcount, int maxcount ) -{ - m_internal = new wxSemaphoreInternal( initialcount, maxcount ); -} + m_count--; -wxSemaphore::~wxSemaphore() -{ - delete m_internal; + return wxSEMA_NO_ERROR; } -void wxSemaphore::Wait() +wxSemaError wxSemaphoreInternal::TryWait() { - m_internal->Wait(); -} + wxMutexLocker locker(m_mutex); -bool wxSemaphore::TryWait() -{ - return m_internal->TryWait(); -} + if ( m_count == 0 ) + return wxSEMA_BUSY; -bool wxSemaphore::Wait( unsigned long timeout_millis ) -{ - return m_internal->Wait( timeout_millis ); -} + m_count--; -void wxSemaphore::Post() -{ - m_internal->Post(); + return wxSEMA_NO_ERROR; } -// This class is used by wxThreadInternal to support Delete() on -// a detached thread -class wxRefCountedCondition +wxSemaError wxSemaphoreInternal::WaitTimeout(unsigned long milliseconds) { -public: - // start with a initial reference count of 1 - wxRefCountedCondition() - { - m_refCount = 1; - m_signaled = FALSE; - - m_mutex = new wxMutex(); - m_cond = new wxCondition( m_mutex ); - } - - // increment the reference count - void AddRef() - { - wxMutexLocker locker( *m_mutex ); + wxMutexLocker locker(m_mutex); - m_refCount++; - } + wxLongLong startTime = wxGetLocalTimeMillis(); - // decrement the reference count if reference count is zero then delete the - // object - void DeleteRef() + while ( m_count == 0 ) { - bool shouldDelete = FALSE; - - m_mutex->Lock(); - - if ( --m_refCount == 0 ) + wxLongLong elapsed = wxGetLocalTimeMillis() - startTime; + long remainingTime = (long)milliseconds - (long)elapsed.GetLo(); + if ( remainingTime <= 0 ) { - shouldDelete = TRUE; + // timeout + return wxSEMA_TIMEOUT; } - m_mutex->Unlock(); - - if ( shouldDelete ) + switch ( m_cond.WaitTimeout(remainingTime) ) { - delete this; - } - } - + case wxCOND_TIMEOUT: + return wxSEMA_TIMEOUT; - // sets the object to signaled this signal will be a persistent signal all - // further Wait()s on the object will return without blocking - void SetSignaled() - { - wxMutexLocker locker( *m_mutex ); - - m_signaled = TRUE; + default: + return wxSEMA_MISC_ERROR; - m_cond->Broadcast(); - } - - // wait till the object is signaled if the object was already signaled then - // return immediately - void Wait() - { - wxMutexLocker locker( *m_mutex ); - - if ( !m_signaled ) - { - m_cond->Wait(); + case wxCOND_NO_ERROR: + ; } } -private: - int m_refCount; + m_count--; - wxMutex *m_mutex; - wxCondition *m_cond; + return wxSEMA_NO_ERROR; +} - bool m_signaled; +wxSemaError wxSemaphoreInternal::Post() +{ + wxMutexLocker locker(m_mutex); - // Cannot delete this object directly, call DeleteRef() instead - ~wxRefCountedCondition() + if ( m_maxcount > 0 && m_count == m_maxcount ) { - delete m_cond; - delete m_mutex; + return wxSEMA_OVERFLOW; } - // suppress gcc warning about the class having private dtor and not having - // friend (so what??) - friend class wxDummyFriend; -}; + m_count++; + + wxLogTrace(TRACE_SEMA, + _T("Thread %ld about to signal semaphore, count = %lu"), + wxThread::GetCurrentId(), (unsigned long)m_count); + + return m_cond.Signal() == wxCOND_NO_ERROR ? wxSEMA_NO_ERROR + : wxSEMA_MISC_ERROR; +} // =========================================================================== // wxThread implementation @@ -711,12 +615,10 @@ public: // thread actions // start the thread wxThreadError Run(); + // unblock the thread allowing it to run + void SignalRun() { m_semRun.Post(); } // ask the thread to terminate void Wait(); - // wake up threads waiting for our termination - void SignalExit(); - // wake up threads waiting for our start - void SignalRun() { m_semRun.Post(); } // go to sleep until Resume() is called void Pause(); // resume the thread @@ -728,7 +630,23 @@ public: void SetPriority(int prio) { m_prio = prio; } // state wxThreadState GetState() const { return m_state; } - void SetState(wxThreadState state) { m_state = state; } + void SetState(wxThreadState state) + { +#ifdef __WXDEBUG__ + static const wxChar *stateNames[] = + { + _T("NEW"), + _T("RUNNING"), + _T("PAUSED"), + _T("EXITED"), + }; + + wxLogTrace(TRACE_THREADS, _T("Thread %ld: %s => %s."), + (long)GetId(), stateNames[m_state], stateNames[state]); +#endif // __WXDEBUG__ + + m_state = state; + } // id pthread_t GetId() const { return m_threadId; } pthread_t *GetIdPtr() { return &m_threadId; } @@ -746,12 +664,11 @@ public: // tell the thread that it is a detached one void Detach() { - m_shouldBeJoined = m_shouldBroadcast = FALSE; + wxCriticalSectionLocker lock(m_csJoinFlag); + + m_shouldBeJoined = FALSE; m_isDetached = TRUE; } - // but even detached threads need to notifyus about their termination - // sometimes - tell the thread that it should do it - void Notify() { m_shouldBroadcast = TRUE; } #if HAVE_THREAD_CLEANUP_FUNCTIONS // this is used by wxPthreadCleanup() only @@ -761,7 +678,7 @@ public: private: pthread_t m_threadId; // id of the thread wxThreadState m_state; // see wxThreadState enum - int m_prio; // in wxWindows units: from 0 to 100 + int m_prio; // in wxWidgets units: from 0 to 100 // this flag is set when the thread should terminate bool m_cancelled; @@ -777,7 +694,6 @@ private: // pthread_join(), so we have to keep track of this wxCriticalSection m_csJoinFlag; bool m_shouldBeJoined; - bool m_shouldBroadcast; bool m_isDetached; // this semaphore is posted by Run() and the threads Entry() is not @@ -787,11 +703,6 @@ private: // this one is signaled when the thread should resume after having been // Pause()d wxSemaphore m_semSuspend; - - // finally this one is signalled when the thread exits - // we are using a reference counted condition to support - // Delete() for a detached thread - wxRefCountedCondition *m_condEnd; }; // ---------------------------------------------------------------------------- @@ -807,7 +718,7 @@ void *wxThreadInternal::PthreadStart(wxThread *thread) { wxThreadInternal *pthread = thread->m_internal; - wxLogTrace(TRACE_THREADS, _T("Thread %ld started."), pthread->GetId()); + wxLogTrace(TRACE_THREADS, _T("Thread %ld started."), THR_ID(pthread)); // associate the thread pointer with the newly created thread so that // wxThread::This() will work @@ -844,17 +755,19 @@ void *wxThreadInternal::PthreadStart(wxThread *thread) if ( !dontRunAtAll ) { // call the main entry + wxLogTrace(TRACE_THREADS, + _T("Thread %ld about to enter its Entry()."), + THR_ID(pthread)); + pthread->m_exitcode = thread->Entry(); - wxLogTrace(TRACE_THREADS, _T("Thread %ld left its Entry()."), - pthread->GetId()); + wxLogTrace(TRACE_THREADS, + _T("Thread %ld Entry() returned %lu."), + THR_ID(pthread), (unsigned long)pthread->m_exitcode); { wxCriticalSectionLocker lock(thread->m_critsect); - wxLogTrace(TRACE_THREADS, _T("Thread %ld changes state to EXITED."), - pthread->GetId()); - // change the state of the thread to "exited" so that // wxPthreadCleanup handler won't do anything from now (if it's // called before we do pthread_cleanup_pop below) @@ -872,6 +785,7 @@ void *wxThreadInternal::PthreadStart(wxThread *thread) if ( dontRunAtAll ) { + // FIXME: deleting a possibly joinable thread here??? delete thread; return EXITCODE_CANCELLED; @@ -929,15 +843,11 @@ wxThreadInternal::wxThreadInternal() // defaults for joinable threads m_shouldBeJoined = TRUE; - m_shouldBroadcast = TRUE; m_isDetached = FALSE; - - m_condEnd = new wxRefCountedCondition(); } wxThreadInternal::~wxThreadInternal() { - m_condEnd->DeleteRef(); } wxThreadError wxThreadInternal::Run() @@ -945,46 +855,30 @@ wxThreadError wxThreadInternal::Run() wxCHECK_MSG( GetState() == STATE_NEW, wxTHREAD_RUNNING, wxT("thread may only be started once after Create()") ); - SignalRun(); - SetState(STATE_RUNNING); + // wake up threads waiting for our start + SignalRun(); + return wxTHREAD_NO_ERROR; } void wxThreadInternal::Wait() { + wxCHECK_RET( !m_isDetached, _T("can't wait for a detached thread") ); + // if the thread we're waiting for is waiting for the GUI mutex, we will // deadlock so make sure we release it temporarily if ( wxThread::IsMain() ) wxMutexGuiLeave(); - bool isDetached = m_isDetached; - wxThreadIdType id = (wxThreadIdType) GetId(); - wxLogTrace(TRACE_THREADS, - _T("Starting to wait for thread %ld to exit."), id); - - // wait until the thread terminates (we're blocking in _another_ thread, - // of course) - - // a reference counting condition is used to handle the - // case where a detached thread deletes itself - // before m_condEnd->Wait() returns - // in this case the deletion of the condition object is deferred until - // all Wait()ing threads have finished calling DeleteRef() - m_condEnd->AddRef(); - m_condEnd->Wait(); - m_condEnd->DeleteRef(); - - wxLogTrace(TRACE_THREADS, _T("Finished waiting for thread %ld."), id); + _T("Starting to wait for thread %ld to exit."), + THR_ID(this)); - // we can't use any member variables any more if the thread is detached - // because it could be already deleted - if ( !isDetached ) + // to avoid memory leaks we should call pthread_join(), but it must only be + // done once so use a critical section to serialize the code below { - // to avoid memory leaks we should call pthread_join(), but it must - // only be done once wxCriticalSectionLocker lock(m_csJoinFlag); if ( m_shouldBeJoined ) @@ -993,10 +887,13 @@ void wxThreadInternal::Wait() // we're cancelled inside pthread_join(), things will almost // certainly break - but if we disable the cancellation, we // might deadlock - if ( pthread_join((pthread_t)id, &m_exitcode) != 0 ) + if ( pthread_join(GetId(), &m_exitcode) != 0 ) { - wxLogError(_("Failed to join a thread, potential memory leak " - "detected - please restart the program")); + // this is a serious problem, so use wxLogError and not + // wxLogDebug: it is possible to bring the system to its knees + // by creating too many threads and not joining them quite + // easily + wxLogError(_("Failed to join a thread, potential memory leak detected - please restart the program")); } m_shouldBeJoined = FALSE; @@ -1008,22 +905,6 @@ void wxThreadInternal::Wait() wxMutexGuiEnter(); } -void wxThreadInternal::SignalExit() -{ - wxLogTrace(TRACE_THREADS, _T("Thread %ld about to exit."), GetId()); - - SetState(STATE_EXITED); - - // wake up all the threads waiting for our termination - if there are any - if ( m_shouldBroadcast ) - { - wxLogTrace(TRACE_THREADS, _T("Thread %ld signals end condition."), - GetId()); - - m_condEnd->SetSignaled(); - } -} - void wxThreadInternal::Pause() { // the state is set from the thread which pauses us first, this function @@ -1031,7 +912,8 @@ void wxThreadInternal::Pause() wxCHECK_RET( m_state == STATE_PAUSED, wxT("thread must first be paused with wxThread::Pause().") ); - wxLogTrace(TRACE_THREADS, _T("Thread %ld goes to sleep."), GetId()); + wxLogTrace(TRACE_THREADS, + _T("Thread %ld goes to sleep."), THR_ID(this)); // wait until the semaphore is Post()ed from Resume() m_semSuspend.Wait(); @@ -1046,7 +928,8 @@ void wxThreadInternal::Resume() // TestDestroy() since the last call to Pause() for example if ( IsReallyPaused() ) { - wxLogTrace(TRACE_THREADS, _T("Waking up thread %ld"), GetId()); + wxLogTrace(TRACE_THREADS, + _T("Waking up thread %ld"), THR_ID(this)); // wake up Pause() m_semSuspend.Post(); @@ -1056,8 +939,8 @@ void wxThreadInternal::Resume() } else { - wxLogTrace(TRACE_THREADS, _T("Thread %ld is not yet really paused"), - GetId()); + wxLogTrace(TRACE_THREADS, + _T("Thread %ld is not yet really paused"), THR_ID(this)); } SetState(STATE_RUNNING); @@ -1074,7 +957,7 @@ wxThread *wxThread::This() bool wxThread::IsMain() { - return (bool)pthread_equal(pthread_self(), gs_tidMain); + return (bool)pthread_equal(pthread_self(), gs_tidMain) || gs_tidMain == (pthread_t)-1; } void wxThread::Yield() @@ -1086,7 +969,7 @@ void wxThread::Yield() void wxThread::Sleep(unsigned long milliseconds) { - wxUsleep(milliseconds); + wxMilliSleep(milliseconds); } int wxThread::GetCPUCount() @@ -1103,8 +986,8 @@ int wxThread::GetCPUCount() wxString s; if ( file.ReadAll(&s) ) { - // (ab)use Replace() to find the number of "processor" strings - size_t count = s.Replace(_T("processor"), _T("")); + // (ab)use Replace() to find the number of "processor: num" strings + size_t count = s.Replace(_T("processor\t:"), _T("")); if ( count > 0 ) { return count; @@ -1130,19 +1013,24 @@ int wxThread::GetCPUCount() return -1; } +// VMS is a 64 bit system and threads have 64 bit pointers. +// FIXME: also needed for other systems???? #ifdef __VMS - // VMS is a 64 bit system and threads have 64 bit pointers. - // ??? also needed for other systems???? unsigned long long wxThread::GetCurrentId() { return (unsigned long long)pthread_self(); -#else +} + +#else // !__VMS + unsigned long wxThread::GetCurrentId() { return (unsigned long)pthread_self(); -#endif } +#endif // __VMS/!__VMS + + bool wxThread::SetConcurrency(size_t level) { #ifdef HAVE_THR_SETCONCURRENCY @@ -1318,6 +1206,45 @@ void wxThread::SetPriority(unsigned int prio) case STATE_RUNNING: case STATE_PAUSED: #ifdef HAVE_THREAD_PRIORITY_FUNCTIONS +#if defined(__LINUX__) +// On Linux, pthread_setschedparam with SCHED_OTHER does not allow +// a priority other than 0. Instead, we use the BSD setpriority +// which alllows us to set a 'nice' value between 20 to -20. Only +// super user can set a value less than zero (more negative yields +// higher priority). setpriority set the static priority of a process, +// but this is OK since Linux is configured as a thread per process. + { + float fPrio; + float pSpan; + int iPrio; + + // Map Wx priorites (WXTHREAD_MIN_PRIORITY - + // WXTHREAD_MAX_PRIORITY) into BSD priorities (20 - -20). + // Do calculation of values instead of hard coding them + // to make maintenance easier. + + pSpan = ((float)(WXTHREAD_MAX_PRIORITY - WXTHREAD_MIN_PRIORITY)) / 2.0; + + // prio starts as ................... // value => (0) >= p <= (n) + + fPrio = ((float)prio) - pSpan; // value => (-n) >= p <= (+n) + + fPrio = 0.0 - fPrio; // value => (+n) <= p >= (-n) + + fPrio = fPrio * (20. / pSpan) + .5; // value => (20) <= p >= (-20) + + iPrio = (int)fPrio; + + // Clamp prio from 20 - -20; + iPrio = (iPrio > 20) ? 20 : iPrio; + iPrio = (iPrio < -20) ? -20 : iPrio; + + if (setpriority(PRIO_PROCESS, 0, iPrio) == -1) + { + wxLogError(_("Failed to set thread priority %d."), prio); + } + } +#else // __LINUX__ { struct sched_param sparam; sparam.sched_priority = prio; @@ -1328,6 +1255,7 @@ void wxThread::SetPriority(unsigned int prio) wxLogError(_("Failed to set thread priority %d."), prio); } } +#endif // __LINUX__ #endif // HAVE_THREAD_PRIORITY_FUNCTIONS break; @@ -1367,9 +1295,6 @@ wxThreadError wxThread::Pause() return wxTHREAD_NOT_RUNNING; } - wxLogTrace(TRACE_THREADS, _T("Asking thread %ld to pause."), - GetId()); - // just set a flag, the thread will be really paused only during the next // call to TestDestroy() m_internal->SetState(STATE_PAUSED); @@ -1430,27 +1355,22 @@ wxThreadError wxThread::Delete(ExitCode *rc) wxCHECK_MSG( This() != this, wxTHREAD_MISC_ERROR, _T("a thread can't delete itself") ); + bool isDetached = m_isDetached; + m_critsect.Enter(); wxThreadState state = m_internal->GetState(); // ask the thread to stop m_internal->SetCancelFlag(); - if ( m_isDetached ) - { - // detached threads won't broadcast about their termination by default - // because usually nobody waits for them - but here we do, so ask the - // thread to notify us - m_internal->Notify(); - } - m_critsect.Leave(); switch ( state ) { case STATE_NEW: // we need to wake up the thread so that PthreadStart() will - // terminate - right now it's blocking on m_semRun + // terminate - right now it's blocking on run semaphore in + // PthreadStart() m_internal->SignalRun(); // fall through @@ -1460,24 +1380,24 @@ wxThreadError wxThread::Delete(ExitCode *rc) break; case STATE_PAUSED: - // resume the thread first (don't call our Resume() because this - // would dead lock when it tries to enter m_critsect) + // resume the thread first m_internal->Resume(); // fall through default: - // wait until the thread stops - m_internal->Wait(); - - if ( rc ) + if ( !isDetached ) { - wxASSERT_MSG( !m_isDetached, - _T("no return code for detached threads") ); + // wait until the thread stops + m_internal->Wait(); - // if it's a joinable thread, it's not deleted yet - *rc = m_internal->GetExitCode(); + if ( rc ) + { + // return the exit code of the thread + *rc = m_internal->GetExitCode(); + } } + //else: can't wait for detached threads } return wxTHREAD_NO_ERROR; @@ -1535,13 +1455,15 @@ wxThreadError wxThread::Kill() void wxThread::Exit(ExitCode status) { wxASSERT_MSG( This() == this, - _T("wxThread::Exit() can only be called in the " - "context of the same thread") ); + _T("wxThread::Exit() can only be called in the context of the same thread") ); - // from the moment we call OnExit(), the main program may terminate at any - // moment, so mark this thread as being already in process of being - // deleted or wxThreadModule::OnExit() will try to delete it again - ScheduleThreadForDeletion(); + if ( m_isDetached ) + { + // from the moment we call OnExit(), the main program may terminate at + // any moment, so mark this thread as being already in process of being + // deleted or wxThreadModule::OnExit() will try to delete it again + ScheduleThreadForDeletion(); + } // don't enter m_critsect before calling OnExit() because the user code // might deadlock if, for example, it signals a condition in OnExit() (a @@ -1549,17 +1471,6 @@ void wxThread::Exit(ExitCode status) // m_critsect on us (almost all of them do) OnExit(); - // now do enter it because SignalExit() will change our state - m_critsect.Enter(); - - // next wake up the threads waiting for us (OTOH, this function won't return - // until someone waited for us!) - m_internal->SignalExit(); - - // leave the critical section before entering the dtor which tries to - // enter it - m_critsect.Leave(); - // delete C++ thread object if this is a detached thread - user is // responsible for doing this for joinable ones if ( m_isDetached ) @@ -1583,8 +1494,7 @@ void wxThread::Exit(ExitCode status) bool wxThread::TestDestroy() { wxASSERT_MSG( This() == this, - _T("wxThread::TestDestroy() can only be called in the " - "context of the same thread") ); + _T("wxThread::TestDestroy() can only be called in the context of the same thread") ); m_critsect.Enter(); @@ -1617,8 +1527,7 @@ wxThread::~wxThread() if ( m_internal->GetState() != STATE_EXITED && m_internal->GetState() != STATE_NEW ) { - wxLogDebug(_T("The thread %ld is being destroyed although it is still " - "running! The application may crash."), GetId()); + wxLogDebug(_T("The thread %ld is being destroyed although it is still running! The application may crash."), GetId()); } m_critsect.Leave(); @@ -1628,18 +1537,6 @@ wxThread::~wxThread() // remove this thread from the global array gs_allThreads.Remove(this); - - // detached thread will decrement this counter in DeleteThread(), but it - // is not called for the joinable threads, so do it here - if ( !m_isDetached ) - { - wxMutexLocker lock( *gs_mutexDeleteThread ); - - gs_nThreadsBeingDeleted--; - - wxLogTrace(TRACE_THREADS, _T("%u scheduled for deletion threads left."), - gs_nThreadsBeingDeleted - 1); - } } // ----------------------------------------------------------------------------- @@ -1696,22 +1593,18 @@ bool wxThreadModule::OnInit() int rc = pthread_key_create(&gs_keySelf, NULL /* dtor function */); if ( rc != 0 ) { - wxLogSysError(rc, _("Thread module initialization failed: " - "failed to create thread key")); + wxLogSysError(rc, _("Thread module initialization failed: failed to create thread key")); return FALSE; } gs_tidMain = pthread_self(); -#if wxUSE_GUI gs_mutexGui = new wxMutex(); - gs_mutexGui->Lock(); -#endif // wxUSE_GUI gs_mutexDeleteThread = new wxMutex(); - gs_condAllDeleted = new wxCondition( gs_mutexDeleteThread ); + gs_condAllDeleted = new wxCondition( *gs_mutexDeleteThread ); return TRUE; } @@ -1728,9 +1621,10 @@ void wxThreadModule::OnExit() nThreadsBeingDeleted = gs_nThreadsBeingDeleted; if ( nThreadsBeingDeleted > 0 ) -{ - wxLogTrace(TRACE_THREADS, _T("Waiting for %u threads to disappear"), - nThreadsBeingDeleted); + { + wxLogTrace(TRACE_THREADS, + _T("Waiting for %lu threads to disappear"), + (unsigned long)nThreadsBeingDeleted); // have to wait until all of them disappear gs_condAllDeleted->Wait(); @@ -1741,8 +1635,8 @@ void wxThreadModule::OnExit() size_t count = gs_allThreads.GetCount(); if ( count != 0u ) { - wxLogDebug(wxT("%u threads were not terminated by the application."), - count); + wxLogDebug(wxT("%lu threads were not terminated by the application."), + (unsigned long)count); } for ( size_t n = 0u; n < count; n++ ) @@ -1752,12 +1646,9 @@ void wxThreadModule::OnExit() gs_allThreads[0]->Delete(); } -#if wxUSE_GUI // destroy GUI mutex gs_mutexGui->Unlock(); - delete gs_mutexGui; -#endif // wxUSE_GUI // and free TLD slot (void)pthread_key_delete(gs_keySelf); @@ -1776,8 +1667,8 @@ static void ScheduleThreadForDeletion() gs_nThreadsBeingDeleted++; - wxLogTrace(TRACE_THREADS, _T("%u thread%s waiting to be deleted"), - gs_nThreadsBeingDeleted, + wxLogTrace(TRACE_THREADS, _T("%lu thread%s waiting to be deleted"), + (unsigned long)gs_nThreadsBeingDeleted, gs_nThreadsBeingDeleted == 1 ? "" : "s"); } @@ -1792,11 +1683,10 @@ static void DeleteThread(wxThread *This) delete This; wxCHECK_RET( gs_nThreadsBeingDeleted > 0, - _T("no threads scheduled for deletion, yet we delete " - "one?") ); + _T("no threads scheduled for deletion, yet we delete one?") ); - wxLogTrace(TRACE_THREADS, _T("%u scheduled for deletion threads left."), - gs_nThreadsBeingDeleted - 1); + wxLogTrace(TRACE_THREADS, _T("%lu scheduled for deletion threads left."), + (unsigned long)gs_nThreadsBeingDeleted - 1); if ( !--gs_nThreadsBeingDeleted ) { @@ -1807,17 +1697,19 @@ static void DeleteThread(wxThread *This) void wxMutexGuiEnter() { -#if wxUSE_GUI gs_mutexGui->Lock(); -#endif // wxUSE_GUI } void wxMutexGuiLeave() { -#if wxUSE_GUI gs_mutexGui->Unlock(); -#endif // wxUSE_GUI } -#endif - // wxUSE_THREADS +// ---------------------------------------------------------------------------- +// include common implementation code +// ---------------------------------------------------------------------------- + +#include "wx/thrimpl.cpp" + +#endif // wxUSE_THREADS +