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[wxWidgets.git] / include / wx / thread.h

diff --git a/include/wx/thread.h b/include/wx/thread.h
index 9917e594df689cd9cfb81df265b77061966455a3..7c7bab4351ea722d28fbd5c5de99a1681ca66938 100644 (file)
--- 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
 #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
 
     #pragma interface "thread.h"
 #endif
 


@@ -32,8 +32,6 @@
     #undef Yield
 #endif
 
     #undef Yield
 #endif
 

-#include "wx/module.h"
-

 // ----------------------------------------------------------------------------
 // constants
 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------
 // constants
 // ----------------------------------------------------------------------------


@@ -116,10 +114,11 @@ enum wxMutexType
 };
 
 // forward declarations
 };
 
 // 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
 
 // ----------------------------------------------------------------------------
 // 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
 
 // 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
 {
 public:
     // constructor & destructor


@@ -173,15 +172,15 @@ 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
 // 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
     wxMutexLocker(wxMutex& mutex)
 {
 public:
     // lock the mutex in the ctor
     wxMutexLocker(wxMutex& mutex)

-        : m_isOk(FALSE), m_mutex(mutex)
+        : m_isOk(false), m_mutex(mutex)

         { m_isOk = ( m_mutex.Lock() == wxMUTEX_NO_ERROR ); }
 
         { m_isOk = ( m_mutex.Lock() == wxMUTEX_NO_ERROR ); }
 

-    // returns TRUE if mutex was successfully locked in ctor
+    // returns true if mutex was successfully locked in ctor

     bool IsOk() const
         { return m_isOk; }
 
     bool IsOk() const
         { return m_isOk; }
 


@@ -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
 
 // 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__) && !defined(__WXMAC__)

     #define wxCRITSECT_IS_MUTEX 1
     #define wxCRITSECT_IS_MUTEX 1

-#else // MSW || OS2
+
+    #define wxCRITSECT_INLINE inline
+#else // MSW

     #define wxCRITSECT_IS_MUTEX 0
     #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
 #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
 {
 public:
     // ctor & dtor

-    inline wxCriticalSection();
-    inline ~wxCriticalSection();
+    wxCRITSECT_INLINE wxCriticalSection();
+    wxCRITSECT_INLINE ~wxCriticalSection();

 
     // enter the section (the same as locking a mutex)
 
     // enter the section (the same as locking a mutex)

-    inline void Enter();
+    wxCRITSECT_INLINE void Enter();

 
     // leave the critical section (same as unlocking a mutex)
 
     // leave the critical section (same as unlocking a mutex)

-    inline void Leave();
+    wxCRITSECT_INLINE void Leave();

 
 private:
 #if wxCRITSECT_IS_MUTEX
 
 private:
 #if wxCRITSECT_IS_MUTEX


@@ -237,14 +240,30 @@ 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
 #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
     //
     // 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)
+#ifdef __WIN64__
+    typedef char wxCritSectBuffer[40];
+#else // __WIN32__
+    typedef char wxCritSectBuffer[24];
+#endif
+    union
+    {
+        unsigned long m_dummy1;
+        void *m_dummy2;
+
+        wxCritSectBuffer m_buffer;
+    };
+#elif defined(__WXMAC__)
+    void *m_critRegion ;
+#endif // Unix&OS2/Win32

 
     DECLARE_NO_COPY_CLASS(wxCriticalSection)
 };
 
     DECLARE_NO_COPY_CLASS(wxCriticalSection)
 };


@@ -258,9 +277,12 @@ private:
     inline void wxCriticalSection::Leave() { (void)m_mutex.Unlock(); }
 #endif // wxCRITSECT_IS_MUTEX
 
     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
 // wxCriticalSectionLocker is the same to critical sections as wxMutexLocker is

-// to th mutexes
-class WXDLLEXPORT wxCriticalSectionLocker
+// to mutexes
+class WXDLLIMPEXP_BASE wxCriticalSectionLocker

 {
 public:
     wxCriticalSectionLocker(wxCriticalSection& cs)
 {
 public:
     wxCriticalSectionLocker(wxCriticalSection& cs)


@@ -285,7 +307,7 @@ private:
 // thread(s) to wait until some condition is fulfilled
 // ----------------------------------------------------------------------------
 
 // 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.
 {
 public:
     // Each wxCondition object is associated with a (single) wxMutex object.


@@ -295,11 +317,11 @@ public:
     // dtor is not virtual, don't use this class polymorphically
     ~wxCondition();
 
     // dtor is not virtual, don't use this class polymorphically
     ~wxCondition();
 

-    // return TRUE if the condition has been created successfully
+    // return true if the condition has been created successfully

     bool IsOk() const;
 
     // NB: the associated mutex MUST be locked beforehand by the calling thread
     bool IsOk() const;
 
     // NB: the associated mutex MUST be locked beforehand by the calling thread

-    // 
+    //

     // it atomically releases the lock on the associated mutex
     // and starts waiting to be woken up by a Signal()/Broadcast()
     // once its signaled, then it will wait until it can reacquire
     // it atomically releases the lock on the associated mutex
     // and starts waiting to be woken up by a Signal()/Broadcast()
     // once its signaled, then it will wait until it can reacquire


@@ -308,9 +330,9 @@ public:
 
     // exactly as Wait() except that it may also return if the specified
     // timeout ellapses even if the condition hasn't been signalled: in this
 
     // exactly as Wait() except that it may also return if the specified
     // timeout ellapses even if the condition hasn't been signalled: in this

-    // case, the return value is FALSE, otherwise (i.e. in case of a normal
-    // return) it is TRUE
-    // 
+    // case, the return value is false, otherwise (i.e. in case of a normal
+    // return) it is true
+    //

     // the timeeout parameter specifies a interval that needs to be waited in
     // milliseconds
     wxCondError WaitTimeout(unsigned long milliseconds);
     // the timeeout parameter specifies a interval that needs to be waited in
     // milliseconds
     wxCondError WaitTimeout(unsigned long milliseconds);


@@ -347,7 +369,7 @@ private:
 //              a shared resource
 // ----------------------------------------------------------------------------
 
 //              a shared resource
 // ----------------------------------------------------------------------------
 

-class WXDLLEXPORT wxSemaphore
+class WXDLLIMPEXP_BASE wxSemaphore

 {
 public:
     // specifying a maxcount of 0 actually makes wxSemaphore behave as if there
 {
 public:
     // specifying a maxcount of 0 actually makes wxSemaphore behave as if there


@@ -357,7 +379,7 @@ public:
     // dtor is not virtual, don't use this class polymorphically
     ~wxSemaphore();
 
     // dtor is not virtual, don't use this class polymorphically
     ~wxSemaphore();
 

-    // return TRUE if the semaphore has been created successfully
+    // return true if the semaphore has been created successfully

     bool IsOk() const;
 
     // wait indefinitely, until the semaphore count goes beyond 0
     bool IsOk() const;
 
     // wait indefinitely, until the semaphore count goes beyond 0


@@ -383,7 +405,7 @@ private:
 };
 
 // ----------------------------------------------------------------------------
 };
 
 // ----------------------------------------------------------------------------

-// wxThread: class encpasulating a thread of execution
+// wxThread: class encapsulating a thread of execution

 // ----------------------------------------------------------------------------
 
 // there are two different kinds of threads: joinable and detached (default)
 // ----------------------------------------------------------------------------
 
 // there are two different kinds of threads: joinable and detached (default)


@@ -402,7 +424,7 @@ private:
    typedef unsigned long wxThreadIdType;
 #endif
 
    typedef unsigned long wxThreadIdType;
 #endif
 

-class WXDLLEXPORT wxThread
+class WXDLLIMPEXP_BASE wxThread

 {
 public:
     // the return type for the thread function
 {
 public:
     // the return type for the thread function


@@ -443,7 +465,7 @@ public:
         // default value (usually acceptable, but may not yield the best
         // performance for this process)
         //
         // default value (usually acceptable, but may not yield the best
         // performance for this process)
         //

-        // Returns TRUE on success, FALSE otherwise (if not implemented, for
+        // Returns true on success, false otherwise (if not implemented, for

         // example)
     static bool SetConcurrency(size_t level);
 
         // example)
     static bool SetConcurrency(size_t level);
 


@@ -530,16 +552,16 @@ public:
     // NB: this function will not be called if the thread is Kill()ed
     virtual void OnExit() { }
 
     // NB: this function will not be called if the thread is Kill()ed
     virtual void OnExit() { }
 

+    // Returns true if the thread was asked to terminate: this function should
+    // be called by the thread from time to time, otherwise the main thread
+    // will be left forever in Delete()!
+    virtual bool TestDestroy();
+

     // dtor is public, but the detached threads should never be deleted - use
     // Delete() instead (or leave the thread terminate by itself)
     virtual ~wxThread();
 
 protected:
     // dtor is public, but the detached threads should never be deleted - use
     // Delete() instead (or leave the thread terminate by itself)
     virtual ~wxThread();
 
 protected:

-    // Returns TRUE if the thread was asked to terminate: this function should
-    // be called by the thread from time to time, otherwise the main thread
-    // will be left forever in Delete()!
-    bool TestDestroy();
-

     // exits from the current thread - can be called only from this thread
     void Exit(ExitCode exitcode = 0);
 
     // exits from the current thread - can be called only from this thread
     void Exit(ExitCode exitcode = 0);
 


@@ -564,38 +586,146 @@ private:
     bool m_isDetached;
 };
 
     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.
 // ----------------------------------------------------------------------------
 // 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
 
 // 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)
 
 #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
 #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)
 
 // 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)
 
 #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
 
 #endif // wxUSE_THREADS/!wxUSE_THREADS
 

+// mark part of code as being a critical section: this macro declares a
+// critical section with the given name and enters it immediately and leaves
+// it at the end of the current scope
+//
+// example:
+//
+//      int Count()
+//      {
+//          static int s_counter = 0;
+//
+//          wxCRITICAL_SECTION(counter);
+//
+//          return ++s_counter;
+//      }
+//
+// this function is MT-safe in presence of the threads but there is no
+// overhead when the library is compiled without threads
+#define wxCRITICAL_SECTION(name) \
+    wxCRIT_SECT_DECLARE(s_cs##name);  \
+    wxCRIT_SECT_LOCKER(cs##name##Locker, s_cs##name)
+

 // automatically lock GUI mutex in ctor and unlock it in dtor
 // automatically lock GUI mutex in ctor and unlock it in dtor

-class WXDLLEXPORT wxMutexGuiLocker
+class WXDLLIMPEXP_BASE wxMutexGuiLocker

 {
 public:
     wxMutexGuiLocker() { wxMutexGuiEnter(); }
 {
 public:
     wxMutexGuiLocker() { wxMutexGuiEnter(); }


@@ -608,23 +738,23 @@ public:
 
 #if wxUSE_THREADS
 
 
 #if wxUSE_THREADS
 

-#if defined(__WXMSW__) || defined(__WXMAC__) || defined(__WXPM__)
+#if defined(__WXMSW__) || defined(__WXMAC__) || defined(__WXPM__) || defined(__EMX__)

     // 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
     // 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();
+    // returns true if the main thread has GUI lock
+    extern bool WXDLLIMPEXP_BASE wxGuiOwnedByMainThread();

 
 #ifndef __WXPM__
     // wakes up the main thread if it's sleeping inside ::GetMessage()
 
 #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
 
 #endif // !OS/2
 

-    // return TRUE if the main thread is waiting for some other to terminate:
+    // return true if the main thread is waiting for some other to terminate:

     // wxApp then should block all "dangerous" messages
     // wxApp then should block all "dangerous" messages

-    extern bool WXDLLEXPORT wxIsWaitingForThread();
+    extern bool WXDLLIMPEXP_BASE wxIsWaitingForThread();

 #endif // MSW, Mac, OS/2
 
 #endif // wxUSE_THREADS
 #endif // MSW, Mac, OS/2
 
 #endif // wxUSE_THREADS