// we use wxFFile under Linux in GetCPUCount()
#ifdef __LINUX__
#include "wx/ffile.h"
+ // For setpriority.
+ #include <sys/time.h>
+ #include <sys/resource.h>
#endif
// ----------------------------------------------------------------------------
// 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
// ----------------------------------------------------------------------------
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
// -----------------------------------------------------------------------------
static wxMutex *gs_mutexGui;
#endif // wxUSE_GUI
+// 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
// ============================================================================
// 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()
+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 <sigh>, 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()
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()
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()
// 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;
}
// ===========================================================================
// 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();
- 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 *GetMutex() const { return &m_mutex.m_internal->m_mutex; }
+ 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(wxMutex& mutex)
: m_mutex(mutex)
{
- if ( pthread_cond_init( &m_cond, NULL ) != 0 )
- {
- wxLogDebug(_T("pthread_cond_init() failed"));
- }
-}
+ int err = pthread_cond_init(&m_cond, NULL /* default attributes */);
-wxConditionInternal::~wxConditionInternal()
-{
- if ( pthread_cond_destroy( &m_cond ) != 0 )
- {
- wxLogDebug(_T("pthread_cond_destroy() failed"));
- }
-}
+ m_isOk = err == 0;
-void wxConditionInternal::Wait()
-{
- if ( pthread_cond_wait( &m_cond, GetMutex() ) != 0 )
+ if ( !m_isOk )
{
- wxLogDebug(_T("pthread_cond_wait() failed"));
+ wxLogApiError(_T("pthread_cond_init()"), err);
}
}
-bool wxConditionInternal::Wait( const timespec *ts )
+wxConditionInternal::~wxConditionInternal()
{
- int result = pthread_cond_timedwait( &m_cond, GetMutex(), ts );
- if ( result == ETIMEDOUT )
- return FALSE;
-
- if ( result != 0 )
+ if ( m_isOk )
{
- wxLogDebug(_T("pthread_cond_timedwait() failed"));
+ int err = pthread_cond_destroy(&m_cond);
+ if ( err != 0 )
+ {
+ wxLogApiError(_T("pthread_cond_destroy()"), err);
+ }
}
-
- return TRUE;
}
-void wxConditionInternal::Signal()
-{
- int result = pthread_cond_signal( &m_cond );
- if ( result != 0 )
+wxCondError wxConditionInternal::Wait()
{
- wxFAIL_MSG( _T("pthread_cond_signal() failed") );
- }
-}
+ int err = pthread_cond_wait(&m_cond, GetPMutex());
+ if ( err != 0 )
+ {
+ wxLogApiError(_T("pthread_cond_wait()"), err);
-void wxConditionInternal::Broadcast()
-{
- int result = pthread_cond_broadcast( &m_cond );
- if ( result != 0 )
-{
- wxFAIL_MSG( _T("pthread_cond_broadcast() failed") );
+ return wxCOND_MISC_ERROR;
}
-}
-
-
-// ---------------------------------------------------------------------------
-// wxCondition
-// ---------------------------------------------------------------------------
-
-wxCondition::wxCondition(wxMutex& mutex)
-{
- m_internal = new wxConditionInternal( mutex );
-}
-
-wxCondition::~wxCondition()
-{
- delete m_internal;
-}
-void wxCondition::Wait()
-{
- m_internal->Wait();
+ return wxCOND_NO_ERROR;
}
-bool wxCondition::Wait( unsigned long timeout_millis )
+wxCondError wxConditionInternal::WaitTimeout(unsigned long milliseconds)
{
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();
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()
{
- 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()
{
- 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;
}
// ===========================================================================
// 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 )
+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 or maximal count") );
+
+ m_isOk = FALSE;
+ }
+ else
{
- wxFAIL_MSG( _T("wxSemaphore: invalid initial count") );
+ m_maxcount = (size_t)maxcount;
+ m_count = (size_t)initialcount;
}
- maxcount = maxcount;
- count = initialcount;
+ m_isOk = m_mutex.IsOk() && m_cond.IsOk();
}
-void wxSemaphoreInternal::Wait()
+wxSemaError wxSemaphoreInternal::Wait()
{
wxMutexLocker locker(m_mutex);
- while ( count <= 0 )
+ while ( m_count == 0 )
{
- m_cond.Wait();
+ wxLogTrace(TRACE_SEMA,
+ "Thread %ld waiting for semaphore to become signalled",
+ wxThread::GetCurrentId());
+
+ if ( m_cond.Wait() != wxCOND_NO_ERROR )
+ return wxSEMA_MISC_ERROR;
+
+ wxLogTrace(TRACE_SEMA,
+ "Thread %ld finished waiting for semaphore, count = %u",
+ wxThread::GetCurrentId(), m_count);
}
- count--;
+ m_count--;
+
+ return wxSEMA_NO_ERROR;
}
-bool wxSemaphoreInternal::TryWait()
+wxSemaError wxSemaphoreInternal::TryWait()
{
wxMutexLocker locker(m_mutex);
- if ( count <= 0 )
- return FALSE;
+ if ( m_count == 0 )
+ return wxSEMA_BUSY;
- count--;
+ m_count--;
- return TRUE;
+ return wxSEMA_NO_ERROR;
}
-bool wxSemaphoreInternal::Wait( unsigned long timeout_millis )
+wxSemaError wxSemaphoreInternal::WaitTimeout(unsigned long milliseconds)
{
wxMutexLocker locker(m_mutex);
wxLongLong startTime = wxGetLocalTimeMillis();
- while ( count <= 0 )
+ while ( m_count == 0 )
{
wxLongLong elapsed = wxGetLocalTimeMillis() - startTime;
- long remainingTime = (long)timeout_millis - (long)elapsed.GetLo();
+ long remainingTime = (long)milliseconds - (long)elapsed.GetLo();
if ( remainingTime <= 0 )
- return FALSE;
+ {
+ // timeout
+ return wxSEMA_TIMEOUT;
+ }
- bool result = m_cond.Wait( remainingTime );
- if ( !result )
- return FALSE;
+ if ( m_cond.Wait(remainingTime) != wxCOND_NO_ERROR )
+ return wxSEMA_MISC_ERROR;
}
- count--;
+ m_count--;
- return TRUE;
+ return wxSEMA_NO_ERROR;
}
-void wxSemaphoreInternal::Post()
+wxSemaError wxSemaphoreInternal::Post()
{
wxMutexLocker locker(m_mutex);
- if ( maxcount > 0 && count == maxcount )
+ if ( m_maxcount > 0 && m_count == m_maxcount )
{
- wxFAIL_MSG( _T("wxSemaphore::Post() overflow") );
+ return wxSEMA_OVERFLOW;
}
- count++;
-
- m_cond.Signal();
-}
-
-// --------------------------------------------------------------------------
-// wxSemaphore
-// --------------------------------------------------------------------------
+ m_count++;
-wxSemaphore::wxSemaphore( int initialcount, int maxcount )
-{
- m_internal = new wxSemaphoreInternal( initialcount, maxcount );
+ wxLogTrace(TRACE_SEMA,
+ "Thread %ld about to signal semaphore, count = %u",
+ wxThread::GetCurrentId(), m_count);
+
+ return m_cond.Signal() == wxCOND_NO_ERROR ? wxSEMA_NO_ERROR
+ : wxSEMA_MISC_ERROR;
}
-wxSemaphore::~wxSemaphore()
-{
- delete m_internal;
-}
-
-void wxSemaphore::Wait()
-{
- m_internal->Wait();
-}
-
-bool wxSemaphore::TryWait()
-{
- return m_internal->TryWait();
-}
-
-bool wxSemaphore::Wait( unsigned long timeout_millis )
-{
- return m_internal->Wait( timeout_millis );
-}
-
-void wxSemaphore::Post()
-{
- m_internal->Post();
-}
-
-// This class is used by wxThreadInternal to support Delete() on
-// a detached thread
-class wxRefCountedCondition
-{
-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 );
-
- m_refCount++;
- }
-
- // decrement the reference count if reference count is zero then delete the
- // object
- void DeleteRef()
- {
- bool shouldDelete = FALSE;
-
- m_mutex->Lock();
-
- if ( --m_refCount == 0 )
- {
- shouldDelete = TRUE;
- }
-
- m_mutex->Unlock();
-
- if ( shouldDelete )
- {
- delete this;
- }
- }
-
-
- // 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;
-
- 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();
- }
- }
-
-private:
- int m_refCount;
-
- wxMutex *m_mutex;
- wxCondition *m_cond;
-
- bool m_signaled;
-
- // Cannot delete this object directly, call DeleteRef() instead
- ~wxRefCountedCondition()
- {
- delete m_cond;
- delete m_mutex;
- }
-
- // suppress gcc warning about the class having private dtor and not having
- // friend (so what??)
- friend class wxDummyFriend;
-};
-
// ===========================================================================
// wxThread implementation
// ===========================================================================
// 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
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."),
+ 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; }
// 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
// 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
// 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;
};
// ----------------------------------------------------------------------------
if ( !dontRunAtAll )
{
// call the main entry
+ wxLogTrace(TRACE_THREADS, _T("Thread %ld about to enter its Entry()."),
+ pthread->GetId());
+
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."),
+ pthread->GetId(), (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)
if ( dontRunAtAll )
{
+ // FIXME: deleting a possibly joinable thread here???
delete thread;
return EXITCODE_CANCELLED;
// 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()
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);
+ _T("Starting to wait for thread %ld to exit."), GetId());
- // 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);
-
- // 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 )
// 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((pthread_t)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"));
}
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
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;
wxLogError(_("Failed to set thread priority %d."), prio);
}
}
+#endif // __LINUX__
#endif // HAVE_THREAD_PRIORITY_FUNCTIONS
break;
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);
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
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;
_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
// 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 )
// 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);
- }
}
// -----------------------------------------------------------------------------
nThreadsBeingDeleted = gs_nThreadsBeingDeleted;
if ( nThreadsBeingDeleted > 0 )
-{
+ {
wxLogTrace(TRACE_THREADS, _T("Waiting for %u threads to disappear"),
- nThreadsBeingDeleted);
+ nThreadsBeingDeleted);
// have to wait until all of them disappear
gs_condAllDeleted->Wait();
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);
#endif // wxUSE_GUI
}
-#endif
- // wxUSE_THREADS
+// ----------------------------------------------------------------------------
+// include common implementation code
+// ----------------------------------------------------------------------------
+
+#include "wx/thrimpl.cpp"
+
+#endif // wxUSE_THREADS
+
projects / wxWidgets.git / blobdiff