X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/76df57d24ef6c9d386587a84e52901754f7c4652..1fa29bdc254c03dd5026a4b72aa8312667178121:/include/wx/thread.h

diff --git a/include/wx/thread.h b/include/wx/thread.h
index 49e7b0a582..b3cc0a45f0 100644
--- a/include/wx/thread.h
+++ b/include/wx/thread.h
@@ -23,7 +23,7 @@
 #if wxUSE_THREADS
 
 // only for wxUSE_THREADS - otherwise we'd get undefined symbols
-#ifdef __GNUG__
+#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
     #pragma interface "thread.h"
 #endif
 
@@ -32,8 +32,6 @@
     #undef Yield
 #endif
 
-#include "wx/module.h"
-
 // ----------------------------------------------------------------------------
 // constants
 // ----------------------------------------------------------------------------
@@ -116,10 +114,11 @@ enum wxMutexType
 };
 
 // forward declarations
-class WXDLLEXPORT wxConditionInternal;
-class WXDLLEXPORT wxMutexInternal;
-class WXDLLEXPORT wxSemaphoreInternal;
-class WXDLLEXPORT wxThreadInternal;
+class WXDLLIMPEXP_BASE wxThreadHelper;
+class WXDLLIMPEXP_BASE wxConditionInternal;
+class WXDLLIMPEXP_BASE wxMutexInternal;
+class WXDLLIMPEXP_BASE wxSemaphoreInternal;
+class WXDLLIMPEXP_BASE wxThreadInternal;
 
 // ----------------------------------------------------------------------------
 // A mutex object is a synchronization object whose state is set to signaled
@@ -130,7 +129,7 @@ class WXDLLEXPORT wxThreadInternal;
 
 // you should consider wxMutexLocker whenever possible instead of directly
 // working with wxMutex class - it is safer
-class WXDLLEXPORT wxMutex
+class WXDLLIMPEXP_BASE wxMutex
 {
 public:
     // constructor & destructor
@@ -173,7 +172,7 @@ protected:
 // a helper class which locks the mutex in the ctor and unlocks it in the dtor:
 // this ensures that mutex is always unlocked, even if the function returns or
 // throws an exception before it reaches the end
-class WXDLLEXPORT wxMutexLocker
+class WXDLLIMPEXP_BASE wxMutexLocker
 {
 public:
     // lock the mutex in the ctor
@@ -210,26 +209,30 @@ private:
 
 // in order to avoid any overhead under platforms where critical sections are
 // just mutexes make all wxCriticalSection class functions inline
-#if !defined(__WXMSW__) && !defined(__WXPM__)
+#if !defined(__WXMSW__)
     #define wxCRITSECT_IS_MUTEX 1
-#else // MSW || OS2
+
+    #define wxCRITSECT_INLINE inline
+#else // MSW
     #define wxCRITSECT_IS_MUTEX 0
+
+    #define wxCRITSECT_INLINE
 #endif // MSW/!MSW
 
 // you should consider wxCriticalSectionLocker whenever possible instead of
 // directly working with wxCriticalSection class - it is safer
-class WXDLLEXPORT wxCriticalSection
+class WXDLLIMPEXP_BASE wxCriticalSection
 {
 public:
     // ctor & dtor
-    wxCriticalSection();
-    ~wxCriticalSection();
+    wxCRITSECT_INLINE wxCriticalSection();
+    wxCRITSECT_INLINE ~wxCriticalSection();
 
     // enter the section (the same as locking a mutex)
-    void Enter();
+    wxCRITSECT_INLINE void Enter();
 
     // leave the critical section (same as unlocking a mutex)
-    void Leave();
+    wxCRITSECT_INLINE void Leave();
 
 private:
 #if wxCRITSECT_IS_MUTEX
@@ -237,30 +240,43 @@ private:
 #elif defined(__WXMSW__)
     // we can't allocate any memory in the ctor, so use placement new -
     // unfortunately, we have to hardcode the sizeof() here because we can't
-    // include windows.h from this public header
+    // include windows.h from this public header and we also have to use the
+    // union to force the correct (i.e. maximal) alignment
     //
     // if CRITICAL_SECTION size changes in Windows, you'll get an assert from
     // thread.cpp and will need to increase the buffer size
-    char m_buffer[24];
-#else
-    // nothing for OS/2
-#endif // Unix/Win32/OS2
+    //
+    // finally, we need this typedef instead of declaring m_buffer directly
+    // because otherwise the assert mentioned above wouldn't compile with some
+    // compilers (notably CodeWarrior 8)
+    typedef char wxCritSectBuffer[24];
+    union
+    {
+        unsigned long m_dummy1;
+        void *m_dummy2;
+
+        wxCritSectBuffer m_buffer;
+    };
+#endif // Unix&OS2/Win32
 
     DECLARE_NO_COPY_CLASS(wxCriticalSection)
 };
 
 #if wxCRITSECT_IS_MUTEX
     // implement wxCriticalSection using mutexes
-    wxCriticalSection::wxCriticalSection() { }
-    wxCriticalSection::~wxCriticalSection() { }
+    inline wxCriticalSection::wxCriticalSection() { }
+    inline wxCriticalSection::~wxCriticalSection() { }
 
-    void wxCriticalSection::Enter() { (void)m_mutex.Lock(); }
-    void wxCriticalSection::Leave() { (void)m_mutex.Unlock(); }
+    inline void wxCriticalSection::Enter() { (void)m_mutex.Lock(); }
+    inline void wxCriticalSection::Leave() { (void)m_mutex.Unlock(); }
 #endif // wxCRITSECT_IS_MUTEX
 
+#undef wxCRITSECT_INLINE
+#undef wxCRITSECT_IS_MUTEX
+
 // wxCriticalSectionLocker is the same to critical sections as wxMutexLocker is
 // to th mutexes
-class WXDLLEXPORT wxCriticalSectionLocker
+class WXDLLIMPEXP_BASE wxCriticalSectionLocker
 {
 public:
     wxCriticalSectionLocker(wxCriticalSection& cs)
@@ -285,7 +301,7 @@ private:
 // thread(s) to wait until some condition is fulfilled
 // ----------------------------------------------------------------------------
 
-class WXDLLEXPORT wxCondition
+class WXDLLIMPEXP_BASE wxCondition
 {
 public:
     // Each wxCondition object is associated with a (single) wxMutex object.
@@ -347,7 +363,7 @@ private:
 //              a shared resource
 // ----------------------------------------------------------------------------
 
-class WXDLLEXPORT wxSemaphore
+class WXDLLIMPEXP_BASE wxSemaphore
 {
 public:
     // specifying a maxcount of 0 actually makes wxSemaphore behave as if there
@@ -402,7 +418,7 @@ private:
    typedef unsigned long wxThreadIdType;
 #endif
 
-class WXDLLEXPORT wxThread
+class WXDLLIMPEXP_BASE wxThread
 {
 public:
     // the return type for the thread function
@@ -564,34 +580,121 @@ private:
     bool m_isDetached;
 };
 
+// wxThreadHelperThread class
+// --------------------------
+
+class WXDLLIMPEXP_BASE wxThreadHelperThread : public wxThread
+{
+public:
+    // constructor only creates the C++ thread object and doesn't create (or
+    // start) the real thread
+    wxThreadHelperThread(wxThreadHelper& owner)
+        : wxThread(wxTHREAD_JOINABLE), m_owner(owner)
+        { }
+
+protected:
+    // entry point for the thread -- calls Entry() in owner.
+    virtual void *Entry();
+
+private:
+    // the owner of the thread
+    wxThreadHelper& m_owner;
+
+    // no copy ctor/assignment operator
+    wxThreadHelperThread(const wxThreadHelperThread&);
+    wxThreadHelperThread& operator=(const wxThreadHelperThread&);
+};
+
+// ----------------------------------------------------------------------------
+// wxThreadHelper: this class implements the threading logic to run a
+// background task in another object (such as a window).  It is a mix-in: just
+// derive from it to implement a threading background task in your class.
+// ----------------------------------------------------------------------------
+
+class WXDLLIMPEXP_BASE wxThreadHelper
+{
+private:
+    void KillThread()
+    {
+        if ( m_thread )
+        {
+            m_thread->Kill();
+            delete m_thread;
+        }
+    }
+
+public:
+    // constructor only initializes m_thread to NULL
+    wxThreadHelper() : m_thread(NULL) { }
+
+    // destructor deletes m_thread
+    virtual ~wxThreadHelper() { KillThread(); }
+
+    // create a new thread (and optionally set the stack size on platforms that
+    // support/need that), call Run() to start it
+    wxThreadError Create(unsigned int stackSize = 0)
+    {
+        KillThread();
+
+        m_thread = new wxThreadHelperThread(*this);
+
+        return m_thread->Create(stackSize);
+    }
+
+    // entry point for the thread - called by Run() and executes in the context
+    // of this thread.
+    virtual void *Entry() = 0;
+
+    // returns a pointer to the thread which can be used to call Run()
+    wxThread *GetThread() const { return m_thread; }
+
+protected:
+    wxThread *m_thread;
+};
+
+// call Entry() in owner, put it down here to avoid circular declarations
+inline void *wxThreadHelperThread::Entry()
+{
+    return m_owner.Entry();
+}
+
 // ----------------------------------------------------------------------------
 // Automatic initialization
 // ----------------------------------------------------------------------------
 
 // GUI mutex handling.
-void WXDLLEXPORT wxMutexGuiEnter();
-void WXDLLEXPORT wxMutexGuiLeave();
+void WXDLLIMPEXP_BASE wxMutexGuiEnter();
+void WXDLLIMPEXP_BASE wxMutexGuiLeave();
 
 // macros for entering/leaving critical sections which may be used without
 // having to take them inside "#if wxUSE_THREADS"
 #define wxENTER_CRIT_SECT(cs)   (cs).Enter()
 #define wxLEAVE_CRIT_SECT(cs)   (cs).Leave()
 #define wxCRIT_SECT_DECLARE(cs) static wxCriticalSection cs
+#define wxCRIT_SECT_DECLARE_MEMBER(cs) wxCriticalSection cs
 #define wxCRIT_SECT_LOCKER(name, cs)  wxCriticalSectionLocker name(cs)
 
+// function for checking if we're in the main thread which may be used whether
+// wxUSE_THREADS is 0 or 1
+inline bool wxIsMainThread() { return wxThread::IsMain(); }
+
 #else // !wxUSE_THREADS
 
 // no thread support
-inline void WXDLLEXPORT wxMutexGuiEnter() { }
-inline void WXDLLEXPORT wxMutexGuiLeave() { }
+inline void WXDLLIMPEXP_BASE wxMutexGuiEnter() { }
+inline void WXDLLIMPEXP_BASE wxMutexGuiLeave() { }
 
 // macros for entering/leaving critical sections which may be used without
 // having to take them inside "#if wxUSE_THREADS"
 #define wxENTER_CRIT_SECT(cs)
 #define wxLEAVE_CRIT_SECT(cs)
 #define wxCRIT_SECT_DECLARE(cs)
+#define wxCRIT_SECT_DECLARE_MEMBER(cs)
 #define wxCRIT_SECT_LOCKER(name, cs)
 
+// if there is only one thread, it is always the main one
+inline bool wxIsMainThread() { return true; }
+
 #endif // wxUSE_THREADS/!wxUSE_THREADS
 
 // mark part of code as being a critical section: this macro declares a
@@ -616,7 +719,7 @@ inline void WXDLLEXPORT wxMutexGuiLeave() { }
     wxCRIT_SECT_LOCKER(cs##name##Locker, s_cs##name)
 
 // automatically lock GUI mutex in ctor and unlock it in dtor
-class WXDLLEXPORT wxMutexGuiLocker
+class WXDLLIMPEXP_BASE wxMutexGuiLocker
 {
 public:
     wxMutexGuiLocker() { wxMutexGuiEnter(); }
@@ -633,19 +736,19 @@ public:
     // unlock GUI if there are threads waiting for and lock it back when
     // there are no more of them - should be called periodically by the main
     // thread
-    extern void WXDLLEXPORT wxMutexGuiLeaveOrEnter();
+    extern void WXDLLIMPEXP_BASE wxMutexGuiLeaveOrEnter();
 
     // returns TRUE if the main thread has GUI lock
-    extern bool WXDLLEXPORT wxGuiOwnedByMainThread();
+    extern bool WXDLLIMPEXP_BASE wxGuiOwnedByMainThread();
 
 #ifndef __WXPM__
     // wakes up the main thread if it's sleeping inside ::GetMessage()
-    extern void WXDLLEXPORT wxWakeUpMainThread();
+    extern void WXDLLIMPEXP_BASE wxWakeUpMainThread();
 #endif // !OS/2
 
     // return TRUE if the main thread is waiting for some other to terminate:
     // wxApp then should block all "dangerous" messages
-    extern bool WXDLLEXPORT wxIsWaitingForThread();
+    extern bool WXDLLIMPEXP_BASE wxIsWaitingForThread();
 #endif // MSW, Mac, OS/2
 
 #endif // wxUSE_THREADS