X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/9fc3ad34c5326856aeebf02335244ae315cef688..04fa04d8067d235ab45b5bc05b65f0679634b541:/src/unix/threadpsx.cpp diff --git a/src/unix/threadpsx.cpp b/src/unix/threadpsx.cpp index 1ab453633f..22fefee76d 100644 --- a/src/unix/threadpsx.cpp +++ b/src/unix/threadpsx.cpp @@ -1,14 +1,15 @@ ///////////////////////////////////////////////////////////////////////////// -// Name: threadpsx.cpp +// Name: src/unix/threadpsx.cpp // Purpose: wxThread (Posix) Implementation // Author: Original from Wolfram Gloger/Guilhem Lavaux -// Modified by: +// Modified by: K. S. Sreeram (2002): POSIXified wxCondition, added wxSemaphore // Created: 04/22/98 // RCS-ID: $Id$ // Copyright: (c) Wolfram Gloger (1996, 1997) // Guilhem Lavaux (1998) -// Vadim Zeitlin (1999) +// Vadim Zeitlin (1999-2002) // Robert Roebling (1999) +// K. S. Sreeram (2002) // Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// @@ -20,33 +21,48 @@ // headers // ---------------------------------------------------------------------------- -#ifdef __GNUG__ - #pragma implementation "thread.h" -#endif - -// With simple makefiles, we must ignore the file body if not using -// threads. -#include "wx/setup.h" +// for compilers that support precompilation, includes "wx.h". +#include "wx/wxprec.h" #if wxUSE_THREADS #include "wx/thread.h" -#include "wx/module.h" -#include "wx/utils.h" -#include "wx/log.h" -#include "wx/intl.h" -#include "wx/dynarray.h" +#include "wx/except.h" + +#ifndef WX_PRECOMP + #include "wx/app.h" + #include "wx/dynarray.h" + #include "wx/intl.h" + #include "wx/log.h" + #include "wx/utils.h" + #include "wx/timer.h" + #include "wx/stopwatch.h" + #include "wx/module.h" +#endif #include #include #include #include #include - -#if HAVE_SCHED_H +#include // needed for at least __QNX__ +#ifdef HAVE_SCHED_H #include #endif +#ifdef HAVE_THR_SETCONCURRENCY + #include +#endif + +// we use wxFFile under Linux in GetCPUCount() +#ifdef __LINUX__ + #include "wx/ffile.h" + #include // for setpriority() +#endif + +#define THR_ID_CAST(id) (reinterpret_cast(id)) +#define THR_ID(thr) THR_ID_CAST((thr)->GetId()) + // ---------------------------------------------------------------------------- // constants // ---------------------------------------------------------------------------- @@ -63,8 +79,11 @@ enum wxThreadState // the exit value of a thread which has been cancelled static const wxThread::ExitCode EXITCODE_CANCELLED = (wxThread::ExitCode)-1; -// our trace mask -#define TRACE_THREADS _T("thread") +// trace mask for wxThread operations +#define TRACE_THREADS wxT("thread") + +// you can get additional debugging messages for the semaphore operations +#define TRACE_SEMA wxT("semaphore") // ---------------------------------------------------------------------------- // private functions @@ -77,36 +96,10 @@ static void DeleteThread(wxThread *This); // private classes // ---------------------------------------------------------------------------- -// same as wxMutexLocker but for "native" mutex -class MutexLock -{ -public: - MutexLock(pthread_mutex_t& mutex) - { - m_mutex = &mutex; - if ( pthread_mutex_lock(m_mutex) != 0 ) - { - wxLogDebug(_T("pthread_mutex_lock() failed")); - } - } - - ~MutexLock() - { - if ( pthread_mutex_unlock(m_mutex) != 0 ) - { - wxLogDebug(_T("pthread_mutex_unlock() failed")); - } - } +// an (non owning) array of pointers to threads +WX_DEFINE_ARRAY_PTR(wxThread *, wxArrayThread); -private: - pthread_mutex_t *m_mutex; -}; - -// ---------------------------------------------------------------------------- -// types -// ---------------------------------------------------------------------------- - -WX_DEFINE_ARRAY(wxThread *, wxArrayThread); +// an entry for a thread we can wait for // ----------------------------------------------------------------------------- // global data @@ -117,8 +110,15 @@ WX_DEFINE_ARRAY(wxThread *, wxArrayThread); // be left in memory static wxArrayThread gs_allThreads; +// a mutex to protect gs_allThreads +static wxMutex *gs_mutexAllThreads = NULL; + // the id of the main thread -static pthread_t gs_tidMain; +// +// we suppose that 0 is not a valid pthread_t value but in principle this might +// be false (e.g. if it's a selector-like value), wxThread::IsMain() would need +// to be updated in such case +wxThreadIdType wxThread::ms_idMainThread = 0; // the key for the pointer to the associated wxThread object static pthread_key_t gs_keySelf; @@ -128,254 +128,570 @@ static pthread_key_t gs_keySelf; static size_t gs_nThreadsBeingDeleted = 0; // a mutex to protect gs_nThreadsBeingDeleted -static pthread_mutex_t gs_mutexDeleteThread = PTHREAD_MUTEX_INITIALIZER; +static wxMutex *gs_mutexDeleteThread = NULL; // and a condition variable which will be signaled when all // gs_nThreadsBeingDeleted will have been deleted -static wxCondition *gs_condAllDeleted = (wxCondition *)NULL; +static wxCondition *gs_condAllDeleted = NULL; -#if wxUSE_GUI - // this mutex must be acquired before any call to a GUI function - static wxMutex *gs_mutexGui; -#endif // wxUSE_GUI +#ifndef __WXOSX__ +// 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; +#endif + +// 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 // ============================================================================ -// implementation +// wxMutex implementation // ============================================================================ -//-------------------------------------------------------------------- -// wxMutex (Posix implementation) -//-------------------------------------------------------------------- +// ---------------------------------------------------------------------------- +// wxMutexInternal +// ---------------------------------------------------------------------------- +// this is a simple wrapper around pthread_mutex_t which provides error +// checking class wxMutexInternal { public: + wxMutexInternal(wxMutexType mutexType); + ~wxMutexInternal(); + + wxMutexError Lock(); + wxMutexError Lock(unsigned long ms); + wxMutexError TryLock(); + wxMutexError Unlock(); + + bool IsOk() const { return m_isOk; } + +private: + // convert the result of pthread_mutex_[timed]lock() call to wx return code + wxMutexError HandleLockResult(int err); + +private: pthread_mutex_t m_mutex; + bool m_isOk; + wxMutexType m_type; + unsigned long m_owningThread; + + // wxConditionInternal uses our m_mutex + friend class wxConditionInternal; }; -wxMutex::wxMutex() +#if defined(HAVE_PTHREAD_MUTEXATTR_T) && \ + wxUSE_UNIX && !defined(HAVE_PTHREAD_MUTEXATTR_SETTYPE_DECL) +// 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) { - m_internal = new wxMutexInternal; + m_type = mutexType; + m_owningThread = 0; - pthread_mutex_init(&(m_internal->m_mutex), - (pthread_mutexattr_t*) NULL ); - m_locked = 0; -} + 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); -wxMutex::~wxMutex() -{ - if (m_locked > 0) - wxLogDebug(wxT("Freeing a locked mutex (%d locks)"), m_locked); + 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; + } +#else // no recursive mutexes + err = EINVAL; +#endif // HAVE_PTHREAD_MUTEXATTR_T/... + break; - pthread_mutex_destroy( &(m_internal->m_mutex) ); - delete m_internal; + default: + wxFAIL_MSG( wxT("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); + } } -wxMutexError wxMutex::Lock() +wxMutexInternal::~wxMutexInternal() { - int err = pthread_mutex_lock( &(m_internal->m_mutex) ); - if (err == EDEADLK) + if ( m_isOk ) { - wxLogDebug(wxT("Locking this mutex would lead to deadlock!")); - - return wxMUTEX_DEAD_LOCK; + int err = pthread_mutex_destroy(&m_mutex); + if ( err != 0 ) + { + wxLogApiError( wxT("pthread_mutex_destroy()"), err); + } } +} - m_locked++; +wxMutexError wxMutexInternal::Lock() +{ + if ((m_type == wxMUTEX_DEFAULT) && (m_owningThread != 0)) + { + if (m_owningThread == wxThread::GetCurrentId()) + return wxMUTEX_DEAD_LOCK; + } - return wxMUTEX_NO_ERROR; + return HandleLockResult(pthread_mutex_lock(&m_mutex)); } -wxMutexError wxMutex::TryLock() +wxMutexError wxMutexInternal::Lock(unsigned long ms) { - if (m_locked) +#ifdef HAVE_PTHREAD_MUTEX_TIMEDLOCK + static const long MSEC_IN_SEC = 1000; + static const long NSEC_IN_MSEC = 1000000; + static const long NSEC_IN_USEC = 1000; + static const long NSEC_IN_SEC = MSEC_IN_SEC * NSEC_IN_MSEC; + + time_t seconds = ms/MSEC_IN_SEC; + long nanoseconds = (ms % MSEC_IN_SEC) * NSEC_IN_MSEC; + timespec ts = { 0, 0 }; + + // normally we should use clock_gettime(CLOCK_REALTIME) here but this + // function is in librt and we don't link with it currently, so use + // gettimeofday() instead -- if it turns out that this is really too + // imprecise, we should modify configure to check if clock_gettime() is + // available and whether it requires -lrt and use it instead +#if 0 + if ( clock_gettime(CLOCK_REALTIME, &ts) == 0 ) { - return wxMUTEX_BUSY; + } +#else + struct timeval tv; + if ( wxGetTimeOfDay(&tv) != -1 ) + { + ts.tv_sec = tv.tv_sec; + ts.tv_nsec = tv.tv_usec*NSEC_IN_USEC; + } +#endif + else // fall back on system timer + { + ts.tv_sec = time(NULL); } - int err = pthread_mutex_trylock( &(m_internal->m_mutex) ); - switch (err) + ts.tv_sec += seconds; + ts.tv_nsec += nanoseconds; + if ( ts.tv_nsec > NSEC_IN_SEC ) { - case EBUSY: return wxMUTEX_BUSY; + ts.tv_sec += 1; + ts.tv_nsec -= NSEC_IN_SEC; } - m_locked++; + return HandleLockResult(pthread_mutex_timedlock(&m_mutex, &ts)); +#else // !HAVE_PTHREAD_MUTEX_TIMEDLOCK + wxUnusedVar(ms); - return wxMUTEX_NO_ERROR; + return wxMUTEX_MISC_ERROR; +#endif // HAVE_PTHREAD_MUTEX_TIMEDLOCK/!HAVE_PTHREAD_MUTEX_TIMEDLOCK } -wxMutexError wxMutex::Unlock() +wxMutexError wxMutexInternal::HandleLockResult(int err) { - if (m_locked > 0) + // wxPrintf( "err %d\n", err ); + + switch ( err ) { - m_locked--; + case EDEADLK: + // only error checking mutexes return this value and so it's an + // unexpected situation -- hence use assert, not wxLogDebug + wxFAIL_MSG( wxT("mutex deadlock prevented") ); + return wxMUTEX_DEAD_LOCK; + + case EINVAL: + wxLogDebug(wxT("pthread_mutex_[timed]lock(): mutex not initialized")); + break; + + case ETIMEDOUT: + return wxMUTEX_TIMEOUT; + + case 0: + if (m_type == wxMUTEX_DEFAULT) + m_owningThread = wxThread::GetCurrentId(); + return wxMUTEX_NO_ERROR; + + default: + wxLogApiError(wxT("pthread_mutex_[timed]lock()"), err); } - else + + return wxMUTEX_MISC_ERROR; +} + + +wxMutexError wxMutexInternal::TryLock() +{ + int err = pthread_mutex_trylock(&m_mutex); + switch ( err ) { - wxLogDebug(wxT("Unlocking not locked mutex.")); + case EBUSY: + // not an error: mutex is already locked, but we're prepared for + // this + return wxMUTEX_BUSY; + + case EINVAL: + wxLogDebug(wxT("pthread_mutex_trylock(): mutex not initialized.")); + break; - return wxMUTEX_UNLOCKED; + case 0: + if (m_type == wxMUTEX_DEFAULT) + m_owningThread = wxThread::GetCurrentId(); + return wxMUTEX_NO_ERROR; + + default: + wxLogApiError(wxT("pthread_mutex_trylock()"), err); } - pthread_mutex_unlock( &(m_internal->m_mutex) ); + return wxMUTEX_MISC_ERROR; +} + +wxMutexError wxMutexInternal::Unlock() +{ + m_owningThread = 0; + + int err = pthread_mutex_unlock(&m_mutex); + switch ( err ) + { + case EPERM: + // we don't own the mutex + return wxMUTEX_UNLOCKED; + + case EINVAL: + wxLogDebug(wxT("pthread_mutex_unlock(): mutex not initialized.")); + break; + + case 0: + return wxMUTEX_NO_ERROR; - return wxMUTEX_NO_ERROR; + default: + wxLogApiError(wxT("pthread_mutex_unlock()"), err); + } + + return wxMUTEX_MISC_ERROR; } -//-------------------------------------------------------------------- -// wxCondition (Posix implementation) -//-------------------------------------------------------------------- +// =========================================================================== +// wxCondition implementation +// =========================================================================== + +// --------------------------------------------------------------------------- +// wxConditionInternal +// --------------------------------------------------------------------------- -// notice that we must use a mutex with POSIX condition variables to ensure -// that the worker thread doesn't signal condition before the waiting thread -// starts to wait for it +// this is a wrapper around pthread_cond_t associated with a wxMutex (and hence +// with a pthread_mutex_t) class wxConditionInternal { public: - wxConditionInternal(); + wxConditionInternal(wxMutex& mutex); ~wxConditionInternal(); - void Wait(); - bool WaitWithTimeout(const timespec* ts); + bool IsOk() const { return m_isOk && m_mutex.IsOk(); } - void Signal(); - void Broadcast(); + wxCondError Wait(); + wxCondError WaitTimeout(unsigned long milliseconds); + + wxCondError Signal(); + wxCondError Broadcast(); private: - pthread_mutex_t m_mutex; - pthread_cond_t m_condition; + // get the POSIX mutex associated with us + pthread_mutex_t *GetPMutex() const { return &m_mutex.m_internal->m_mutex; } + + wxMutex& m_mutex; + pthread_cond_t m_cond; + + bool m_isOk; }; -wxConditionInternal::wxConditionInternal() +wxConditionInternal::wxConditionInternal(wxMutex& mutex) + : m_mutex(mutex) { - if ( pthread_cond_init(&m_condition, (pthread_condattr_t *)NULL) != 0 ) - { - // this is supposed to never happen - wxFAIL_MSG( _T("pthread_cond_init() failed") ); - } + int err = pthread_cond_init(&m_cond, NULL /* default attributes */); - if ( pthread_mutex_init(&m_mutex, (pthread_mutexattr_t*)NULL) != 0 ) - { - // neither this - wxFAIL_MSG( _T("wxCondition: pthread_mutex_init() failed") ); - } + m_isOk = err == 0; - // initially the mutex is locked, so no thread can Signal() or Broadcast() - // until another thread starts to Wait() - if ( pthread_mutex_lock(&m_mutex) != 0 ) + if ( !m_isOk ) { - wxFAIL_MSG( _T("wxCondition: pthread_mutex_lock() failed") ); + wxLogApiError(wxT("pthread_cond_init()"), err); } } wxConditionInternal::~wxConditionInternal() { - if ( pthread_cond_destroy( &m_condition ) != 0 ) + if ( m_isOk ) { - wxLogDebug(_T("Failed to destroy condition variable (some " - "threads are probably still waiting on it?)")); + int err = pthread_cond_destroy(&m_cond); + if ( err != 0 ) + { + wxLogApiError(wxT("pthread_cond_destroy()"), err); + } } +} - if ( pthread_mutex_unlock( &m_mutex ) != 0 ) +wxCondError wxConditionInternal::Wait() +{ + int err = pthread_cond_wait(&m_cond, GetPMutex()); + if ( err != 0 ) { - wxLogDebug(_T("wxCondition: failed to unlock the mutex")); - } + wxLogApiError(wxT("pthread_cond_wait()"), err); - if ( pthread_mutex_destroy( &m_mutex ) != 0 ) - { - wxLogDebug(_T("Failed to destroy mutex (it is probably locked)")); + return wxCOND_MISC_ERROR; } + + return wxCOND_NO_ERROR; } -void wxConditionInternal::Wait() +wxCondError wxConditionInternal::WaitTimeout(unsigned long milliseconds) { - if ( pthread_cond_wait( &m_condition, &m_mutex ) != 0 ) + wxLongLong curtime = wxGetLocalTimeMillis(); + curtime += milliseconds; + wxLongLong temp = curtime / 1000; + int sec = temp.GetLo(); + temp *= 1000; + temp = curtime - temp; + int millis = temp.GetLo(); + + timespec tspec; + + tspec.tv_sec = sec; + tspec.tv_nsec = millis * 1000L * 1000L; + + int err = pthread_cond_timedwait( &m_cond, GetPMutex(), &tspec ); + switch ( err ) { - // not supposed to ever happen - wxFAIL_MSG( _T("pthread_cond_wait() failed") ); + case ETIMEDOUT: + return wxCOND_TIMEOUT; + + case 0: + return wxCOND_NO_ERROR; + + default: + wxLogApiError(wxT("pthread_cond_timedwait()"), err); } + + return wxCOND_MISC_ERROR; } -bool wxConditionInternal::WaitWithTimeout(const timespec* ts) +wxCondError wxConditionInternal::Signal() { - switch ( pthread_cond_timedwait( &m_condition, &m_mutex, ts ) ) + int err = pthread_cond_signal(&m_cond); + if ( err != 0 ) { - case 0: - // condition signaled - return TRUE; + wxLogApiError(wxT("pthread_cond_signal()"), err); - default: - wxLogDebug(_T("pthread_cond_timedwait() failed")); + return wxCOND_MISC_ERROR; + } - // fall through + return wxCOND_NO_ERROR; +} - case ETIMEDOUT: - case EINTR: - // wait interrupted or timeout elapsed - return FALSE; +wxCondError wxConditionInternal::Broadcast() +{ + int err = pthread_cond_broadcast(&m_cond); + if ( err != 0 ) + { + wxLogApiError(wxT("pthread_cond_broadcast()"), err); + + return wxCOND_MISC_ERROR; } + + return wxCOND_NO_ERROR; } -void wxConditionInternal::Signal() +// =========================================================================== +// wxSemaphore implementation +// =========================================================================== + +// --------------------------------------------------------------------------- +// 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 { - MutexLock lock(m_mutex); +public: + wxSemaphoreInternal(int initialcount, int maxcount); + + bool IsOk() const { return m_isOk; } - if ( pthread_cond_signal( &m_condition ) != 0 ) + wxSemaError Wait(); + wxSemaError TryWait(); + wxSemaError WaitTimeout(unsigned long milliseconds); + + wxSemaError Post(); + +private: + wxMutex m_mutex; + wxCondition m_cond; + + size_t m_count, + m_maxcount; + + bool m_isOk; +}; + +wxSemaphoreInternal::wxSemaphoreInternal(int initialcount, int maxcount) + : m_cond(m_mutex) +{ + + if ( (initialcount < 0 || maxcount < 0) || + ((maxcount > 0) && (initialcount > maxcount)) ) + { + wxFAIL_MSG( wxT("wxSemaphore: invalid initial or maximal count") ); + + m_isOk = false; + } + else { - // shouldn't ever happen - wxFAIL_MSG(_T("pthread_cond_signal() failed")); + m_maxcount = (size_t)maxcount; + m_count = (size_t)initialcount; } + + m_isOk = m_mutex.IsOk() && m_cond.IsOk(); } -void wxConditionInternal::Broadcast() +wxSemaError wxSemaphoreInternal::Wait() { - MutexLock lock(m_mutex); + wxMutexLocker locker(m_mutex); - if ( pthread_cond_broadcast( &m_condition ) != 0 ) + while ( m_count == 0 ) { - // shouldn't ever happen - wxFAIL_MSG(_T("pthread_cond_broadcast() failed")); + wxLogTrace(TRACE_SEMA, + wxT("Thread %p waiting for semaphore to become signalled"), + THR_ID_CAST(wxThread::GetCurrentId())); + + if ( m_cond.Wait() != wxCOND_NO_ERROR ) + return wxSEMA_MISC_ERROR; + + wxLogTrace(TRACE_SEMA, + wxT("Thread %p finished waiting for semaphore, count = %lu"), + THR_ID_CAST(wxThread::GetCurrentId()), (unsigned long)m_count); } -} -wxCondition::wxCondition() -{ - m_internal = new wxConditionInternal; -} + m_count--; -wxCondition::~wxCondition() -{ - delete m_internal; + return wxSEMA_NO_ERROR; } -void wxCondition::Wait() +wxSemaError wxSemaphoreInternal::TryWait() { - m_internal->Wait(); + wxMutexLocker locker(m_mutex); + + if ( m_count == 0 ) + return wxSEMA_BUSY; + + m_count--; + + return wxSEMA_NO_ERROR; } -bool wxCondition::Wait(unsigned long sec, unsigned long nsec) +wxSemaError wxSemaphoreInternal::WaitTimeout(unsigned long milliseconds) { - timespec tspec; + wxMutexLocker locker(m_mutex); + + wxLongLong startTime = wxGetLocalTimeMillis(); + + while ( m_count == 0 ) + { + wxLongLong elapsed = wxGetLocalTimeMillis() - startTime; + long remainingTime = (long)milliseconds - (long)elapsed.GetLo(); + if ( remainingTime <= 0 ) + { + // timeout + return wxSEMA_TIMEOUT; + } + + switch ( m_cond.WaitTimeout(remainingTime) ) + { + case wxCOND_TIMEOUT: + return wxSEMA_TIMEOUT; + + default: + return wxSEMA_MISC_ERROR; + + case wxCOND_NO_ERROR: + ; + } + } - tspec.tv_sec = time(0L) + sec; // FIXME is time(0) correct here? - tspec.tv_nsec = nsec; + m_count--; - return m_internal->WaitWithTimeout(&tspec); + return wxSEMA_NO_ERROR; } -void wxCondition::Signal() +wxSemaError wxSemaphoreInternal::Post() { - m_internal->Signal(); + wxMutexLocker locker(m_mutex); + + if ( m_maxcount > 0 && m_count == m_maxcount ) + { + return wxSEMA_OVERFLOW; + } + + m_count++; + + wxLogTrace(TRACE_SEMA, + wxT("Thread %p about to signal semaphore, count = %lu"), + THR_ID_CAST(wxThread::GetCurrentId()), (unsigned long)m_count); + + return m_cond.Signal() == wxCOND_NO_ERROR ? wxSEMA_NO_ERROR + : wxSEMA_MISC_ERROR; } -void wxCondition::Broadcast() +// =========================================================================== +// wxThread implementation +// =========================================================================== + +// the thread callback functions must have the C linkage +extern "C" { - m_internal->Broadcast(); -} -//-------------------------------------------------------------------- -// wxThread (Posix implementation) -//-------------------------------------------------------------------- +#ifdef wxHAVE_PTHREAD_CLEANUP + // thread exit function + void wxPthreadCleanup(void *ptr); +#endif // wxHAVE_PTHREAD_CLEANUP + +void *wxPthreadStart(void *ptr); + +} // extern "C" + +// ---------------------------------------------------------------------------- +// wxThreadInternal +// ---------------------------------------------------------------------------- class wxThreadInternal { @@ -384,20 +700,15 @@ public: ~wxThreadInternal(); // thread entry function - static void *PthreadStart(void *ptr); - -#if HAVE_THREAD_CLEANUP_FUNCTIONS - // thread exit function - static void PthreadCleanup(void *ptr); -#endif + static void *PthreadStart(wxThread *thread); // 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(); // go to sleep until Resume() is called void Pause(); // resume the thread @@ -409,31 +720,62 @@ 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) + { +#if wxUSE_LOG_TRACE + static const wxChar *const stateNames[] = + { + wxT("NEW"), + wxT("RUNNING"), + wxT("PAUSED"), + wxT("EXITED"), + }; + + wxLogTrace(TRACE_THREADS, wxT("Thread %p: %s => %s."), + THR_ID(this), stateNames[m_state], stateNames[state]); +#endif // wxUSE_LOG_TRACE + + m_state = state; + } // id pthread_t GetId() const { return m_threadId; } pthread_t *GetIdPtr() { return &m_threadId; } // "cancelled" flag - void SetCancelFlag() { m_cancelled = TRUE; } + void SetCancelFlag() { m_cancelled = true; } bool WasCancelled() const { return m_cancelled; } // exit code void SetExitCode(wxThread::ExitCode exitcode) { m_exitcode = exitcode; } wxThread::ExitCode GetExitCode() const { return m_exitcode; } + // the pause flag + void SetReallyPaused(bool paused) { m_isPaused = paused; } + bool IsReallyPaused() const { return m_isPaused; } + // tell the thread that it is a detached one - void Detach() { m_shouldBeJoined = m_shouldBroadcast = FALSE; } - // but even detached threads need to notifyus about their termination - // sometimes - tell the thread that it should do it - void Notify() { m_shouldBroadcast = TRUE; } + void Detach() + { + wxCriticalSectionLocker lock(m_csJoinFlag); + + m_shouldBeJoined = false; + m_isDetached = true; + } + +#ifdef wxHAVE_PTHREAD_CLEANUP + // this is used by wxPthreadCleanup() only + static void Cleanup(wxThread *thread); +#endif // wxHAVE_PTHREAD_CLEANUP 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; + // this flag is set when the thread is blocking on m_semSuspend + bool m_isPaused; + // the thread exit code - only used for joinable (!detached) threads and // is only valid after the thread termination wxThread::ExitCode m_exitcode; @@ -442,35 +784,32 @@ private: // pthread_join(), so we have to keep track of this wxCriticalSection m_csJoinFlag; bool m_shouldBeJoined; - bool m_shouldBroadcast; - - // VZ: it's possible that we might do with less than three different - // condition objects - for example, m_condRun and m_condEnd a priori - // won't be used in the same time. But for now I prefer this may be a - // bit less efficient but safer solution of having distinct condition - // variables for each purpose. + bool m_isDetached; - // this condition is signaled by Run() and the threads Entry() is not + // this semaphore is posted by Run() and the threads Entry() is not // called before it is done - wxCondition m_condRun; + wxSemaphore m_semRun; // this one is signaled when the thread should resume after having been // Pause()d - wxCondition m_condSuspend; - - // finally this one is signalled when the thread exits - wxCondition m_condEnd; + wxSemaphore m_semSuspend; }; // ---------------------------------------------------------------------------- // thread startup and exit functions // ---------------------------------------------------------------------------- -void *wxThreadInternal::PthreadStart(void *ptr) +void *wxPthreadStart(void *ptr) +{ + return wxThreadInternal::PthreadStart((wxThread *)ptr); +} + +void *wxThreadInternal::PthreadStart(wxThread *thread) { - wxThread *thread = (wxThread *)ptr; wxThreadInternal *pthread = thread->m_internal; + wxLogTrace(TRACE_THREADS, wxT("Thread %p started."), THR_ID(pthread)); + // associate the thread pointer with the newly created thread so that // wxThread::This() will work int rc = pthread_setspecific(gs_keySelf, thread); @@ -481,56 +820,101 @@ void *wxThreadInternal::PthreadStart(void *ptr) return (void *)-1; } -#if HAVE_THREAD_CLEANUP_FUNCTIONS + // have to declare this before pthread_cleanup_push() which defines a + // block! + bool dontRunAtAll; + +#ifdef wxHAVE_PTHREAD_CLEANUP // install the cleanup handler which will be called if the thread is // cancelled - pthread_cleanup_push(wxThreadInternal::PthreadCleanup, ptr); -#endif // HAVE_THREAD_CLEANUP_FUNCTIONS + pthread_cleanup_push(wxPthreadCleanup, thread); +#endif // wxHAVE_PTHREAD_CLEANUP - // wait for the condition to be signaled from Run() - pthread->m_condRun.Wait(); + // wait for the semaphore to be posted from Run() + pthread->m_semRun.Wait(); - // call the main entry - pthread->m_exitcode = thread->Entry(); + // test whether we should run the run at all - may be it was deleted + // before it started to Run()? + { + wxCriticalSectionLocker lock(thread->m_critsect); - wxLogTrace(TRACE_THREADS, _T("Thread %ld left its Entry()."), - pthread->GetId()); + dontRunAtAll = pthread->GetState() == STATE_NEW && + pthread->WasCancelled(); + } + if ( !dontRunAtAll ) { - wxCriticalSectionLocker lock(thread->m_critsect); + // call the main entry + wxLogTrace(TRACE_THREADS, + wxT("Thread %p about to enter its Entry()."), + THR_ID(pthread)); - wxLogTrace(TRACE_THREADS, _T("Thread %ld changes state to EXITED."), - pthread->GetId()); + wxTRY + { + pthread->m_exitcode = thread->Entry(); + + wxLogTrace(TRACE_THREADS, + wxT("Thread %p Entry() returned %lu."), + THR_ID(pthread), wxPtrToUInt(pthread->m_exitcode)); + } + wxCATCH_ALL( wxTheApp->OnUnhandledException(); ) - // change the state of the thread to "exited" so that PthreadCleanup - // handler won't do anything from now (if it's called before we do - // pthread_cleanup_pop below) - pthread->SetState(STATE_EXITED); + { + wxCriticalSectionLocker lock(thread->m_critsect); + + // 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) + pthread->SetState(STATE_EXITED); + } } - // NB: at least under Linux, pthread_cleanup_push/pop are macros and pop - // contains the matching '}' for the '{' in push, so they must be used - // in the same block! -#if HAVE_THREAD_CLEANUP_FUNCTIONS + // NB: pthread_cleanup_push/pop() are macros and pop contains the matching + // '}' for the '{' in push, so they must be used in the same block! +#ifdef wxHAVE_PTHREAD_CLEANUP + #ifdef __DECCXX + // under Tru64 we get a warning from macro expansion + #pragma message save + #pragma message disable(declbutnotref) + #endif + // remove the cleanup handler without executing it pthread_cleanup_pop(FALSE); -#endif // HAVE_THREAD_CLEANUP_FUNCTIONS - // terminate the thread - thread->Exit(pthread->m_exitcode); + #ifdef __DECCXX + #pragma message restore + #endif +#endif // wxHAVE_PTHREAD_CLEANUP + + if ( dontRunAtAll ) + { + // FIXME: deleting a possibly joinable thread here??? + delete thread; + + return EXITCODE_CANCELLED; + } + else + { + // terminate the thread + thread->Exit(pthread->m_exitcode); - wxFAIL_MSG(wxT("wxThread::Exit() can't return.")); + wxFAIL_MSG(wxT("wxThread::Exit() can't return.")); - return NULL; + return NULL; + } } -#if HAVE_THREAD_CLEANUP_FUNCTIONS +#ifdef wxHAVE_PTHREAD_CLEANUP // this handler is called when the thread is cancelled -void wxThreadInternal::PthreadCleanup(void *ptr) +extern "C" void wxPthreadCleanup(void *ptr) { - wxThread *thread = (wxThread *) ptr; + wxThreadInternal::Cleanup((wxThread *)ptr); +} +void wxThreadInternal::Cleanup(wxThread *thread) +{ + if (pthread_getspecific(gs_keySelf) == 0) return; { wxCriticalSectionLocker lock(thread->m_critsect); if ( thread->m_internal->GetState() == STATE_EXITED ) @@ -544,7 +928,7 @@ void wxThreadInternal::PthreadCleanup(void *ptr) thread->Exit(EXITCODE_CANCELLED); } -#endif // HAVE_THREAD_CLEANUP_FUNCTIONS +#endif // wxHAVE_PTHREAD_CLEANUP // ---------------------------------------------------------------------------- // wxThreadInternal @@ -553,14 +937,17 @@ void wxThreadInternal::PthreadCleanup(void *ptr) wxThreadInternal::wxThreadInternal() { m_state = STATE_NEW; - m_cancelled = FALSE; + m_cancelled = false; m_prio = WXTHREAD_DEFAULT_PRIORITY; m_threadId = 0; m_exitcode = 0; + // set to true only when the thread starts waiting on m_semSuspend + m_isPaused = false; + // defaults for joinable threads - m_shouldBeJoined = TRUE; - m_shouldBroadcast = TRUE; + m_shouldBeJoined = true; + m_isDetached = false; } wxThreadInternal::~wxThreadInternal() @@ -572,58 +959,66 @@ wxThreadError wxThreadInternal::Run() wxCHECK_MSG( GetState() == STATE_NEW, wxTHREAD_RUNNING, wxT("thread may only be started once after Create()") ); - m_condRun.Signal(); - SetState(STATE_RUNNING); + // wake up threads waiting for our start + SignalRun(); + return wxTHREAD_NO_ERROR; } void wxThreadInternal::Wait() { + wxCHECK_RET( !m_isDetached, wxT("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() ) + { +#ifdef __WXOSX__ + // give the thread we're waiting for chance to do the GUI call + // it might be in, we don't do this conditionally as the to be waited on + // thread might have to acquire the mutex later but before terminating + if ( wxGuiOwnedByMainThread() ) + wxMutexGuiLeave(); +#else wxMutexGuiLeave(); +#endif + } - // wait until the thread terminates (we're blocking in _another_ thread, - // of course) - m_condEnd.Wait(); - - // to avoid memory leaks we should call pthread_join(), but it must only - // be done once - wxCriticalSectionLocker lock(m_csJoinFlag); + wxLogTrace(TRACE_THREADS, + wxT("Starting to wait for thread %p to exit."), + THR_ID(this)); - if ( m_shouldBeJoined ) + // 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 { - // FIXME shouldn't we set cancellation type to DISABLED here? If we're - // cancelled inside pthread_join(), things will almost certainly - // break - but if we disable the cancellation, we might deadlock - if ( pthread_join(GetId(), &m_exitcode) != 0 ) + wxCriticalSectionLocker lock(m_csJoinFlag); + + if ( m_shouldBeJoined ) { - wxLogError(_T("Failed to join a thread, potential memory leak " - "detected - please restart the program")); - } + // FIXME shouldn't we set cancellation type to DISABLED here? If + // we're cancelled inside pthread_join(), things will almost + // certainly break - but if we disable the cancellation, we + // might deadlock + if ( pthread_join(GetId(), &m_exitcode) != 0 ) + { + // 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; + m_shouldBeJoined = false; + } } +#ifndef __WXOSX__ // reacquire GUI mutex if ( wxThread::IsMain() ) 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 ) - { - m_condEnd.Broadcast(); - } +#endif } void wxThreadInternal::Pause() @@ -633,10 +1028,11 @@ 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, + wxT("Thread %p goes to sleep."), THR_ID(this)); - // wait until the condition is signaled from Resume() - m_condSuspend.Wait(); + // wait until the semaphore is Post()ed from Resume() + m_semSuspend.Wait(); } void wxThreadInternal::Resume() @@ -644,10 +1040,24 @@ void wxThreadInternal::Resume() wxCHECK_RET( m_state == STATE_PAUSED, wxT("can't resume thread which is not suspended.") ); - wxLogTrace(TRACE_THREADS, _T("Waking up thread %ld"), GetId()); + // the thread might be not actually paused yet - if there were no call to + // TestDestroy() since the last call to Pause() for example + if ( IsReallyPaused() ) + { + wxLogTrace(TRACE_THREADS, + wxT("Waking up thread %p"), THR_ID(this)); + + // wake up Pause() + m_semSuspend.Post(); - // wake up Pause() - m_condSuspend.Signal(); + // reset the flag + SetReallyPaused(false); + } + else + { + wxLogTrace(TRACE_THREADS, + wxT("Thread %p is not yet really paused"), THR_ID(this)); + } SetState(STATE_RUNNING); } @@ -661,19 +1071,74 @@ wxThread *wxThread::This() return (wxThread *)pthread_getspecific(gs_keySelf); } -bool wxThread::IsMain() +void wxThread::Yield() { - return (bool)pthread_equal(pthread_self(), gs_tidMain); +#ifdef HAVE_SCHED_YIELD + sched_yield(); +#endif } -void wxThread::Yield() +int wxThread::GetCPUCount() { - sched_yield(); +#if defined(_SC_NPROCESSORS_ONLN) + // this works for Solaris and Linux 2.6 + int rc = sysconf(_SC_NPROCESSORS_ONLN); + if ( rc != -1 ) + { + return rc; + } +#elif defined(__LINUX__) && wxUSE_FFILE + // read from proc (can't use wxTextFile here because it's a special file: + // it has 0 size but still can be read from) + wxLogNull nolog; + + wxFFile file(wxT("/proc/cpuinfo")); + if ( file.IsOpened() ) + { + // slurp the whole file + wxString s; + if ( file.ReadAll(&s) ) + { + // (ab)use Replace() to find the number of "processor: num" strings + size_t count = s.Replace(wxT("processor\t:"), wxT("")); + if ( count > 0 ) + { + return count; + } + + wxLogDebug(wxT("failed to parse /proc/cpuinfo")); + } + else + { + wxLogDebug(wxT("failed to read /proc/cpuinfo")); + } + } +#endif // different ways to get number of CPUs + + // unknown + return -1; +} + +wxThreadIdType wxThread::GetCurrentId() +{ + return (wxThreadIdType)pthread_self(); } -void wxThread::Sleep(unsigned long milliseconds) + +bool wxThread::SetConcurrency(size_t level) { - wxUsleep(milliseconds); +#ifdef HAVE_THR_SETCONCURRENCY + int rc = thr_setconcurrency(level); + if ( rc != 0 ) + { + wxLogSysError(rc, wxT("thr_setconcurrency() failed")); + } + + return rc == 0; +#else // !HAVE_THR_SETCONCURRENCY + // ok only for the default value + return level == 0; +#endif // HAVE_THR_SETCONCURRENCY/!HAVE_THR_SETCONCURRENCY } // ----------------------------------------------------------------------------- @@ -683,14 +1148,24 @@ void wxThread::Sleep(unsigned long milliseconds) wxThread::wxThread(wxThreadKind kind) { // add this thread to the global list of all threads - gs_allThreads.Add(this); + { + wxMutexLocker lock(*gs_mutexAllThreads); + + gs_allThreads.Add(this); + } m_internal = new wxThreadInternal(); m_isDetached = kind == wxTHREAD_DETACHED; } -wxThreadError wxThread::Create() +#ifdef HAVE_PTHREAD_ATTR_SETSTACKSIZE + #define WXUNUSED_STACKSIZE(identifier) identifier +#else + #define WXUNUSED_STACKSIZE(identifier) WXUNUSED(identifier) +#endif + +wxThreadError wxThread::Create(unsigned int WXUNUSED_STACKSIZE(stackSize)) { if ( m_internal->GetState() != STATE_NEW ) { @@ -702,6 +1177,11 @@ wxThreadError wxThread::Create() pthread_attr_t attr; pthread_attr_init(&attr); +#ifdef HAVE_PTHREAD_ATTR_SETSTACKSIZE + if (stackSize) + pthread_attr_setstacksize(&attr, stackSize); +#endif + #ifdef HAVE_THREAD_PRIORITY_FUNCTIONS int policy; if ( pthread_attr_getschedpolicy(&attr, &policy) != 0 ) @@ -709,8 +1189,18 @@ wxThreadError wxThread::Create() wxLogError(_("Cannot retrieve thread scheduling policy.")); } - int min_prio = sched_get_priority_min(policy), - max_prio = sched_get_priority_max(policy), +#ifdef __VMS__ + /* the pthread.h contains too many spaces. This is a work-around */ +# undef sched_get_priority_max +#undef sched_get_priority_min +#define sched_get_priority_max(_pol_) \ + (_pol_ == SCHED_OTHER ? PRI_FG_MAX_NP : PRI_FIFO_MAX) +#define sched_get_priority_min(_pol_) \ + (_pol_ == SCHED_OTHER ? PRI_FG_MIN_NP : PRI_FIFO_MIN) +#endif + + int max_prio = sched_get_priority_max(policy), + min_prio = sched_get_priority_min(policy), prio = m_internal->GetPriority(); if ( min_prio == -1 || max_prio == -1 ) @@ -734,14 +1224,14 @@ wxThreadError wxThread::Create() struct sched_param sp; if ( pthread_attr_getschedparam(&attr, &sp) != 0 ) { - wxFAIL_MSG(_T("pthread_attr_getschedparam() failed")); + wxFAIL_MSG(wxT("pthread_attr_getschedparam() failed")); } sp.sched_priority = min_prio + (prio*(max_prio - min_prio))/100; if ( pthread_attr_setschedparam(&attr, &sp) != 0 ) { - wxFAIL_MSG(_T("pthread_attr_setschedparam(priority) failed")); + wxFAIL_MSG(wxT("pthread_attr_setschedparam(priority) failed")); } } #endif // HAVE_THREAD_PRIORITY_FUNCTIONS @@ -750,7 +1240,7 @@ wxThreadError wxThread::Create() // this will make the threads created by this process really concurrent if ( pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) != 0 ) { - wxFAIL_MSG(_T("pthread_attr_setscope(PTHREAD_SCOPE_SYSTEM) failed")); + wxFAIL_MSG(wxT("pthread_attr_setscope(PTHREAD_SCOPE_SYSTEM) failed")); } #endif // HAVE_PTHREAD_ATTR_SETSCOPE @@ -761,7 +1251,7 @@ wxThreadError wxThread::Create() { if ( pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0 ) { - wxFAIL_MSG(_T("pthread_attr_setdetachstate(DETACHED) failed")); + wxFAIL_MSG(wxT("pthread_attr_setdetachstate(DETACHED) failed")); } // never try to join detached threads @@ -774,13 +1264,13 @@ wxThreadError wxThread::Create() ( m_internal->GetIdPtr(), &attr, - wxThreadInternal::PthreadStart, + wxPthreadStart, (void *)this ); if ( pthread_attr_destroy(&attr) != 0 ) { - wxFAIL_MSG(_T("pthread_attr_destroy() failed")); + wxFAIL_MSG(wxT("pthread_attr_destroy() failed")); } if ( rc != 0 ) @@ -825,6 +1315,24 @@ 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. + // + // FIXME this is not true for 2.6!! + + // map wx priorites WXTHREAD_MIN_PRIORITY..WXTHREAD_MAX_PRIORITY + // to Unix priorities 20..-20 + if ( setpriority(PRIO_PROCESS, 0, -(2*(int)prio)/5 + 20) == -1 ) + { + wxLogError(_("Failed to set thread priority %d."), prio); + } +#else // __LINUX__ { struct sched_param sparam; sparam.sched_priority = prio; @@ -835,6 +1343,7 @@ void wxThread::SetPriority(unsigned int prio) wxLogError(_("Failed to set thread priority %d."), prio); } } +#endif // __LINUX__ #endif // HAVE_THREAD_PRIORITY_FUNCTIONS break; @@ -851,9 +1360,9 @@ unsigned int wxThread::GetPriority() const return m_internal->GetPriority(); } -unsigned long wxThread::GetId() const +wxThreadIdType wxThread::GetId() const { - return (unsigned long)m_internal->GetId(); + return (wxThreadIdType) m_internal->GetId(); } // ----------------------------------------------------------------------------- @@ -862,6 +1371,9 @@ unsigned long wxThread::GetId() const wxThreadError wxThread::Pause() { + wxCHECK_MSG( This() != this, wxTHREAD_MISC_ERROR, + wxT("a thread can't pause itself") ); + wxCriticalSectionLocker lock(m_critsect); if ( m_internal->GetState() != STATE_RUNNING ) @@ -880,33 +1392,30 @@ wxThreadError wxThread::Pause() wxThreadError wxThread::Resume() { - m_critsect.Enter(); + wxCHECK_MSG( This() != this, wxTHREAD_MISC_ERROR, + wxT("a thread can't resume itself") ); - wxThreadState state = m_internal->GetState(); + wxCriticalSectionLocker lock(m_critsect); - // the thread might be not actually paused yet - if there were no call to - // TestDestroy() since the last call to Pause(), so avoid that - // TestDestroy() deadlocks trying to enter m_critsect by leaving it before - // calling Resume() - m_critsect.Leave(); + wxThreadState state = m_internal->GetState(); switch ( state ) { case STATE_PAUSED: - wxLogTrace(TRACE_THREADS, _T("Thread %ld is suspended, resuming."), - GetId()); + wxLogTrace(TRACE_THREADS, wxT("Thread %p suspended, resuming."), + THR_ID(this)); m_internal->Resume(); return wxTHREAD_NO_ERROR; case STATE_EXITED: - wxLogTrace(TRACE_THREADS, _T("Thread %ld exited, won't resume."), - GetId()); + wxLogTrace(TRACE_THREADS, wxT("Thread %p exited, won't resume."), + THR_ID(this)); return wxTHREAD_NO_ERROR; default: - 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; } @@ -916,72 +1425,85 @@ wxThreadError wxThread::Resume() // exiting thread // ----------------------------------------------------------------------------- -wxThread::ExitCode wxThread::Wait() +wxThread::ExitCode wxThread::Wait(wxThreadWait WXUNUSED(waitMode)) { wxCHECK_MSG( This() != this, (ExitCode)-1, - _T("a thread can't wait for itself") ); + wxT("a thread can't wait for itself") ); wxCHECK_MSG( !m_isDetached, (ExitCode)-1, - _T("can't wait for detached thread") ); + wxT("can't wait for detached thread") ); m_internal->Wait(); return m_internal->GetExitCode(); } -wxThreadError wxThread::Delete(ExitCode *rc) +wxThreadError wxThread::Delete(ExitCode *rc, wxThreadWait WXUNUSED(waitMode)) { + wxCHECK_MSG( This() != this, wxTHREAD_MISC_ERROR, + wxT("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(); + OnDelete(); + switch ( state ) { case STATE_NEW: + // we need to wake up the thread so that PthreadStart() will + // terminate - right now it's blocking on run semaphore in + // PthreadStart() + m_internal->SignalRun(); + + // fall through + case STATE_EXITED: // nothing to do 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 } + if (state == STATE_NEW) + return wxTHREAD_MISC_ERROR; + // for coherency with the MSW implementation, signal the user that + // Delete() was called on a thread which didn't start to run yet. + return wxTHREAD_NO_ERROR; } wxThreadError wxThread::Kill() { wxCHECK_MSG( This() != this, wxTHREAD_MISC_ERROR, - _T("a thread can't kill itself") ); + wxT("a thread can't kill itself") ); + + OnKill(); switch ( m_internal->GetState() ) { @@ -998,24 +1520,26 @@ wxThreadError wxThread::Kill() default: #ifdef HAVE_PTHREAD_CANCEL if ( pthread_cancel(m_internal->GetId()) != 0 ) -#endif +#endif // HAVE_PTHREAD_CANCEL { wxLogError(_("Failed to terminate a thread.")); return wxTHREAD_MISC_ERROR; } +#ifdef HAVE_PTHREAD_CANCEL if ( m_isDetached ) { // if we use cleanup function, this will be done from - // PthreadCleanup() -#if !HAVE_THREAD_CLEANUP_FUNCTIONS + // wxPthreadCleanup() +#ifndef wxHAVE_PTHREAD_CLEANUP ScheduleThreadForDeletion(); - OnExit(); + // don't call OnExit() here, it can only be called in the + // threads context and we're in the context of another thread DeleteThread(this); -#endif // HAVE_THREAD_CLEANUP_FUNCTIONS +#endif // wxHAVE_PTHREAD_CLEANUP } else { @@ -1023,32 +1547,32 @@ wxThreadError wxThread::Kill() } return wxTHREAD_NO_ERROR; +#endif // HAVE_PTHREAD_CANCEL } } void wxThread::Exit(ExitCode status) { - // 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(); + wxASSERT_MSG( This() == this, + wxT("wxThread::Exit() can only be called in the context of the same thread") ); + + 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 // common case) while the main thread calls any of functions entering // 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(); + wxTRY + { + OnExit(); + } + wxCATCH_ALL( wxTheApp->OnUnhandledException(); ) // delete C++ thread object if this is a detached thread - user is // responsible for doing this for joinable ones @@ -1061,21 +1585,33 @@ void wxThread::Exit(ExitCode status) // we make it a global object, but this would mean that we can // only call one thread function at a time :-( DeleteThread(this); + pthread_setspecific(gs_keySelf, 0); + } + else + { + m_critsect.Enter(); + m_internal->SetState(STATE_EXITED); + m_critsect.Leave(); } // terminate the thread (pthread_exit() never returns) pthread_exit(status); - wxFAIL_MSG(_T("pthread_exit() failed")); + wxFAIL_MSG(wxT("pthread_exit() failed")); } // also test whether we were paused bool wxThread::TestDestroy() { + wxASSERT_MSG( This() == this, + wxT("wxThread::TestDestroy() can only be called in the context of the same thread") ); + m_critsect.Enter(); if ( m_internal->GetState() == STATE_PAUSED ) { + m_internal->SetReallyPaused(true); + // leave the crit section or the other threads will stop too if they // try to call any of (seemingly harmless) IsXXX() functions while we // sleep @@ -1094,24 +1630,26 @@ bool wxThread::TestDestroy() wxThread::~wxThread() { -#ifdef __WXDEBUG__ m_critsect.Enter(); // check that the thread either exited or couldn't be created if ( m_internal->GetState() != STATE_EXITED && m_internal->GetState() != STATE_NEW ) { - wxLogDebug(_T("The thread is being destroyed although it is still " - "running! The application may crash.")); + wxLogDebug(wxT("The thread %p is being destroyed although it is still running! The application may crash."), + THR_ID(this)); } m_critsect.Leave(); -#endif // __WXDEBUG__ delete m_internal; // remove this thread from the global array - gs_allThreads.Remove(this); + { + wxMutexLocker lock(*gs_mutexAllThreads); + + gs_allThreads.Remove(this); + } } // ----------------------------------------------------------------------------- @@ -1133,10 +1671,10 @@ bool wxThread::IsAlive() const { case STATE_RUNNING: case STATE_PAUSED: - return TRUE; + return true; default: - return FALSE; + return false; } } @@ -1151,6 +1689,11 @@ bool wxThread::IsPaused() const // wxThreadModule //-------------------------------------------------------------------- +#ifdef __WXOSX__ +void wxOSXThreadModuleOnInit(); +void wxOSXThreadModuleOnExit(); +#endif + class wxThreadModule : public wxModule { public: @@ -1168,21 +1711,26 @@ 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; + return false; } - gs_tidMain = pthread_self(); + wxThread::ms_idMainThread = wxThread::GetCurrentId(); -#if wxUSE_GUI - gs_mutexGui = new wxMutex(); + gs_mutexAllThreads = new wxMutex(); +#ifdef __WXOSX__ + wxOSXThreadModuleOnInit(); +#else + gs_mutexGui = new wxMutex(); gs_mutexGui->Lock(); -#endif // wxUSE_GUI +#endif + + gs_mutexDeleteThread = new wxMutex(); + gs_condAllDeleted = new wxCondition(*gs_mutexDeleteThread); - return TRUE; + return true; } void wxThreadModule::OnExit() @@ -1191,24 +1739,35 @@ void wxThreadModule::OnExit() // are there any threads left which are being deleted right now? size_t nThreadsBeingDeleted; + { - MutexLock lock(gs_mutexDeleteThread); + wxMutexLocker lock( *gs_mutexDeleteThread ); nThreadsBeingDeleted = gs_nThreadsBeingDeleted; - } - if ( nThreadsBeingDeleted > 0 ) - { - wxLogTrace(TRACE_THREADS, _T("Waiting for %u threads to disappear"), - nThreadsBeingDeleted); + if ( nThreadsBeingDeleted > 0 ) + { + wxLogTrace(TRACE_THREADS, + wxT("Waiting for %lu threads to disappear"), + (unsigned long)nThreadsBeingDeleted); - // have to wait until all of them disappear - gs_condAllDeleted->Wait(); + // have to wait until all of them disappear + gs_condAllDeleted->Wait(); + } } - // terminate any threads left - size_t count = gs_allThreads.GetCount(); - if ( count != 0u ) - wxLogDebug(wxT("Some threads were not terminated by the application.")); + size_t count; + + { + wxMutexLocker lock(*gs_mutexAllThreads); + + // terminate any threads left + count = gs_allThreads.GetCount(); + if ( count != 0u ) + { + wxLogDebug(wxT("%lu threads were not terminated by the application."), + (unsigned long)count); + } + } // unlock mutex before deleting the threads as they lock it in their dtor for ( size_t n = 0u; n < count; n++ ) { @@ -1217,15 +1776,21 @@ void wxThreadModule::OnExit() gs_allThreads[0]->Delete(); } -#if wxUSE_GUI + delete gs_mutexAllThreads; + +#ifdef __WXOSX__ + wxOSXThreadModuleOnExit(); +#else // destroy GUI mutex gs_mutexGui->Unlock(); - delete gs_mutexGui; -#endif // wxUSE_GUI +#endif // and free TLD slot (void)pthread_key_delete(gs_keySelf); + + delete gs_condAllDeleted; + delete gs_mutexDeleteThread; } // ---------------------------------------------------------------------------- @@ -1234,58 +1799,57 @@ void wxThreadModule::OnExit() static void ScheduleThreadForDeletion() { - MutexLock lock(gs_mutexDeleteThread); - - if ( gs_nThreadsBeingDeleted == 0 ) - { - gs_condAllDeleted = new wxCondition; - } + wxMutexLocker lock( *gs_mutexDeleteThread ); gs_nThreadsBeingDeleted++; - wxLogTrace(TRACE_THREADS, _T("%u threads waiting to be deleted"), - gs_nThreadsBeingDeleted); + wxLogTrace(TRACE_THREADS, wxT("%lu thread%s waiting to be deleted"), + (unsigned long)gs_nThreadsBeingDeleted, + gs_nThreadsBeingDeleted == 1 ? wxT("") : wxT("s")); } static void DeleteThread(wxThread *This) { - // gs_mutexDeleteThread should be unlocked before signalling the condition - // or wxThreadModule::OnExit() would deadlock - { - MutexLock lock(gs_mutexDeleteThread); + wxLogTrace(TRACE_THREADS, wxT("Thread %p auto deletes."), THR_ID(This)); - wxLogTrace(TRACE_THREADS, _T("Thread %ld auto deletes."), This->GetId()); + delete This; - delete This; + // only lock gs_mutexDeleteThread after deleting the thread to avoid + // calling out into user code with it locked as this may result in + // deadlocks if the thread dtor deletes another thread (see #11501) + wxMutexLocker locker( *gs_mutexDeleteThread ); - wxCHECK_RET( gs_nThreadsBeingDeleted > 0, - _T("no threads scheduled for deletion, yet we delete " - "one?") ); - } + wxCHECK_RET( gs_nThreadsBeingDeleted > 0, + wxT("no threads scheduled for deletion, yet we delete one?") ); + + wxLogTrace(TRACE_THREADS, wxT("%lu threads remain scheduled for deletion."), + (unsigned long)gs_nThreadsBeingDeleted - 1); if ( !--gs_nThreadsBeingDeleted ) { // no more threads left, signal it gs_condAllDeleted->Signal(); - - delete gs_condAllDeleted; - gs_condAllDeleted = (wxCondition *)NULL; } } -void wxMutexGuiEnter() +#ifndef __WXOSX__ + +void wxMutexGuiEnterImpl() { -#if wxUSE_GUI gs_mutexGui->Lock(); -#endif // wxUSE_GUI } -void wxMutexGuiLeave() +void wxMutexGuiLeaveImpl() { -#if wxUSE_GUI gs_mutexGui->Unlock(); -#endif // wxUSE_GUI } #endif - // wxUSE_THREADS + +// ---------------------------------------------------------------------------- +// include common implementation code +// ---------------------------------------------------------------------------- + +#include "wx/thrimpl.cpp" + +#endif // wxUSE_THREADS