http://code.google.com/p/rpcs3/source/detail?r=44

wxWidgets/include/wx/thrimpl.cpp

@@ -0,0 +1,332 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        include/wx/thrimpl.cpp
+// Purpose:     common part of wxThread Implementations
+// Author:      Vadim Zeitlin
+// Modified by:
+// Created:     04.06.02 (extracted from src/*/thread.cpp files)
+// RCS-ID:      $Id: thrimpl.cpp 66922 2011-02-16 22:26:57Z JS $
+// Copyright:   (c) Vadim Zeitlin (2002)
+// Licence:     wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+// this file is supposed to be included only by the various thread.cpp
+
+// ----------------------------------------------------------------------------
+// wxMutex
+// ----------------------------------------------------------------------------
+
+wxMutex::wxMutex(wxMutexType mutexType)
+{
+    m_internal = new wxMutexInternal(mutexType);
+
+    if ( !m_internal->IsOk() )
+    {
+        delete m_internal;
+        m_internal = NULL;
+    }
+}
+
+wxMutex::~wxMutex()
+{
+    delete m_internal;
+}
+
+bool wxMutex::IsOk() const
+{
+    return m_internal != NULL;
+}
+
+wxMutexError wxMutex::Lock()
+{
+    wxCHECK_MSG( m_internal, wxMUTEX_INVALID,
+                 wxT("wxMutex::Lock(): not initialized") );
+
+    return m_internal->Lock();
+}
+
+wxMutexError wxMutex::TryLock()
+{
+    wxCHECK_MSG( m_internal, wxMUTEX_INVALID,
+                 wxT("wxMutex::TryLock(): not initialized") );
+
+    return m_internal->TryLock();
+}
+
+wxMutexError wxMutex::Unlock()
+{
+    wxCHECK_MSG( m_internal, wxMUTEX_INVALID,
+                 wxT("wxMutex::Unlock(): not initialized") );
+
+    return m_internal->Unlock();
+}
+
+// --------------------------------------------------------------------------
+// wxConditionInternal
+// --------------------------------------------------------------------------
+
+// Win32 and OS/2 don't have explicit support for the POSIX condition
+// variables and their events/event semaphores have quite different semantics,
+// so we reimplement the conditions from scratch using the mutexes and
+// semaphores
+#if defined(__WXMSW__) || defined(__OS2__) || defined(__EMX__)
+
+class wxConditionInternal
+{
+public:
+    wxConditionInternal(wxMutex& mutex);
+
+    bool IsOk() const { return m_mutex.IsOk() && m_semaphore.IsOk(); }
+
+    wxCondError Wait();
+    wxCondError WaitTimeout(unsigned long milliseconds);
+
+    wxCondError Signal();
+    wxCondError Broadcast();
+
+private:
+    // the number of threads currently waiting for this condition
+    LONG m_numWaiters;
+
+    // the critical section protecting m_numWaiters
+    wxCriticalSection m_csWaiters;
+
+    wxMutex& m_mutex;
+    wxSemaphore m_semaphore;
+
+    DECLARE_NO_COPY_CLASS(wxConditionInternal)
+};
+
+wxConditionInternal::wxConditionInternal(wxMutex& mutex)
+                   : m_mutex(mutex)
+{
+    // another thread can't access it until we return from ctor, so no need to
+    // protect access to m_numWaiters here
+    m_numWaiters = 0;
+}
+
+wxCondError wxConditionInternal::Wait()
+{
+    // increment the number of waiters
+    {
+        wxCriticalSectionLocker lock(m_csWaiters);
+        m_numWaiters++;
+    }
+
+    m_mutex.Unlock();
+
+    // after unlocking the mutex other threads may Signal() us, but it is ok
+    // now as we had already incremented m_numWaiters so Signal() will post the
+    // semaphore and decrement m_numWaiters back even if it is called before we
+    // start to Wait()
+    const wxSemaError err = m_semaphore.Wait();
+
+    m_mutex.Lock();
+
+    if ( err == wxSEMA_NO_ERROR )
+    {
+        // m_numWaiters was decremented by Signal()
+        return wxCOND_NO_ERROR;
+    }
+
+    // but in case of an error we need to do it manually
+    {
+        wxCriticalSectionLocker lock(m_csWaiters);
+        m_numWaiters--;
+    }
+
+    return err == wxSEMA_TIMEOUT ? wxCOND_TIMEOUT : wxCOND_MISC_ERROR;
+}
+
+wxCondError wxConditionInternal::WaitTimeout(unsigned long milliseconds)
+{
+    {
+        wxCriticalSectionLocker lock(m_csWaiters);
+        m_numWaiters++;
+    }
+
+    m_mutex.Unlock();
+
+    wxSemaError err = m_semaphore.WaitTimeout(milliseconds);
+
+    m_mutex.Lock();
+
+    if ( err == wxSEMA_NO_ERROR )
+        return wxCOND_NO_ERROR;
+
+    if ( err == wxSEMA_TIMEOUT )
+    {
+        // a potential race condition exists here: it happens when a waiting
+        // thread times out but doesn't have time to decrement m_numWaiters yet
+        // before Signal() is called in another thread
+        //
+        // to handle this particular case, check the semaphore again after
+        // acquiring m_csWaiters lock -- this will catch the signals missed
+        // during this window
+        wxCriticalSectionLocker lock(m_csWaiters);
+
+        err = m_semaphore.WaitTimeout(0);
+        if ( err == wxSEMA_NO_ERROR )
+            return wxCOND_NO_ERROR;
+
+        // we need to decrement m_numWaiters ourselves as it wasn't done by
+        // Signal()
+        m_numWaiters--;
+
+        return err == wxSEMA_TIMEOUT ? wxCOND_TIMEOUT : wxCOND_MISC_ERROR;
+    }
+
+    // undo m_numWaiters++ above in case of an error
+    {
+        wxCriticalSectionLocker lock(m_csWaiters);
+        m_numWaiters--;
+    }
+
+    return wxCOND_MISC_ERROR;
+}
+
+wxCondError wxConditionInternal::Signal()
+{
+    wxCriticalSectionLocker lock(m_csWaiters);
+
+    if ( m_numWaiters > 0 )
+    {
+        // increment the semaphore by 1
+        if ( m_semaphore.Post() != wxSEMA_NO_ERROR )
+            return wxCOND_MISC_ERROR;
+
+        m_numWaiters--;
+    }
+
+    return wxCOND_NO_ERROR;
+}
+
+wxCondError wxConditionInternal::Broadcast()
+{
+    wxCriticalSectionLocker lock(m_csWaiters);
+
+    while ( m_numWaiters > 0 )
+    {
+        if ( m_semaphore.Post() != wxSEMA_NO_ERROR )
+            return wxCOND_MISC_ERROR;
+
+        m_numWaiters--;
+    }
+
+    return wxCOND_NO_ERROR;
+}
+
+#endif // MSW or OS2
+
+// ----------------------------------------------------------------------------
+// wxCondition
+// ----------------------------------------------------------------------------
+
+wxCondition::wxCondition(wxMutex& mutex)
+{
+    m_internal = new wxConditionInternal(mutex);
+
+    if ( !m_internal->IsOk() )
+    {
+        delete m_internal;
+        m_internal = NULL;
+    }
+}
+
+wxCondition::~wxCondition()
+{
+    delete m_internal;
+}
+
+bool wxCondition::IsOk() const
+{
+    return m_internal != NULL;
+}
+
+wxCondError wxCondition::Wait()
+{
+    wxCHECK_MSG( m_internal, wxCOND_INVALID,
+                 wxT("wxCondition::Wait(): not initialized") );
+
+    return m_internal->Wait();
+}
+
+wxCondError wxCondition::WaitTimeout(unsigned long milliseconds)
+{
+    wxCHECK_MSG( m_internal, wxCOND_INVALID,
+                 wxT("wxCondition::Wait(): not initialized") );
+
+    return m_internal->WaitTimeout(milliseconds);
+}
+
+wxCondError wxCondition::Signal()
+{
+    wxCHECK_MSG( m_internal, wxCOND_INVALID,
+                 wxT("wxCondition::Signal(): not initialized") );
+
+    return m_internal->Signal();
+}
+
+wxCondError wxCondition::Broadcast()
+{
+    wxCHECK_MSG( m_internal, wxCOND_INVALID,
+                 wxT("wxCondition::Broadcast(): not initialized") );
+
+    return m_internal->Broadcast();
+}
+
+// --------------------------------------------------------------------------
+// wxSemaphore
+// --------------------------------------------------------------------------
+
+wxSemaphore::wxSemaphore(int initialcount, int maxcount)
+{
+    m_internal = new wxSemaphoreInternal( initialcount, maxcount );
+    if ( !m_internal->IsOk() )
+    {
+        delete m_internal;
+        m_internal = NULL;
+    }
+}
+
+wxSemaphore::~wxSemaphore()
+{
+    delete m_internal;
+}
+
+bool wxSemaphore::IsOk() const
+{
+    return m_internal != NULL;
+}
+
+wxSemaError wxSemaphore::Wait()
+{
+    wxCHECK_MSG( m_internal, wxSEMA_INVALID,
+                 wxT("wxSemaphore::Wait(): not initialized") );
+
+    return m_internal->Wait();
+}
+
+wxSemaError wxSemaphore::TryWait()
+{
+    wxCHECK_MSG( m_internal, wxSEMA_INVALID,
+                 wxT("wxSemaphore::TryWait(): not initialized") );
+
+    return m_internal->TryWait();
+}
+
+wxSemaError wxSemaphore::WaitTimeout(unsigned long milliseconds)
+{
+    wxCHECK_MSG( m_internal, wxSEMA_INVALID,
+                 wxT("wxSemaphore::WaitTimeout(): not initialized") );
+
+    return m_internal->WaitTimeout(milliseconds);
+}
+
+wxSemaError wxSemaphore::Post()
+{
+    wxCHECK_MSG( m_internal, wxSEMA_INVALID,
+                 wxT("wxSemaphore::Post(): not initialized") );
+
+    return m_internal->Post();
+}
+