X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/b5dbe15d0bacde245539f54c4d97af6b4696f01f..032e024c1c6ab6a20226604baab9d00558620e72:/include/wx/thread.h

diff --git a/include/wx/thread.h b/include/wx/thread.h
index 10c30ead59..7e85ae2314 100644
--- a/include/wx/thread.h
+++ b/include/wx/thread.h
@@ -22,11 +22,6 @@
 
 #if wxUSE_THREADS
 
-// Windows headers define it
-#ifdef Yield
-    #undef Yield
-#endif
-
 // ----------------------------------------------------------------------------
 // constants
 // ----------------------------------------------------------------------------
@@ -166,7 +161,7 @@ protected:
 
     friend class wxConditionInternal;
 
-    DECLARE_NO_COPY_CLASS(wxMutex)
+    wxDECLARE_NO_COPY_CLASS(wxMutex);
 };
 
 // a helper class which locks the mutex in the ctor and unlocks it in the dtor:
@@ -209,25 +204,33 @@ 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(__WXMAC__)
+#if !defined(__WXMSW__)
     #define wxCRITSECT_IS_MUTEX 1
 
-    #define wxCRITSECT_INLINE inline
+    #define wxCRITSECT_INLINE WXEXPORT inline
 #else // MSW
     #define wxCRITSECT_IS_MUTEX 0
 
     #define wxCRITSECT_INLINE
 #endif // MSW/!MSW
 
+enum wxCriticalSectionType
+{
+    // recursive critical section
+    wxCRITSEC_DEFAULT,
+
+    // non-recursive critical section
+    wxCRITSEC_NON_RECURSIVE
+};
+
 // you should consider wxCriticalSectionLocker whenever possible instead of
 // directly working with wxCriticalSection class - it is safer
 class WXDLLIMPEXP_BASE wxCriticalSection
 {
 public:
     // ctor & dtor
-    wxCRITSECT_INLINE wxCriticalSection();
+    wxCRITSECT_INLINE wxCriticalSection( wxCriticalSectionType critSecType = wxCRITSEC_DEFAULT );
     wxCRITSECT_INLINE ~wxCriticalSection();
-
     // enter the section (the same as locking a mutex)
     wxCRITSECT_INLINE void Enter();
 
@@ -261,16 +264,15 @@ private:
 
         wxCritSectBuffer m_buffer;
     };
-#elif defined(__WXMAC__)
-    void *m_critRegion ;
 #endif // Unix&OS2/Win32
 
-    DECLARE_NO_COPY_CLASS(wxCriticalSection)
+    wxDECLARE_NO_COPY_CLASS(wxCriticalSection);
 };
 
 #if wxCRITSECT_IS_MUTEX
     // implement wxCriticalSection using mutexes
-    inline wxCriticalSection::wxCriticalSection() { }
+    inline wxCriticalSection::wxCriticalSection( wxCriticalSectionType critSecType )
+       : m_mutex( critSecType == wxCRITSEC_DEFAULT ? wxMUTEX_RECURSIVE : wxMUTEX_DEFAULT )  { }
     inline wxCriticalSection::~wxCriticalSection() { }
 
     inline void wxCriticalSection::Enter() { (void)m_mutex.Lock(); }
@@ -299,7 +301,7 @@ public:
 private:
     wxCriticalSection& m_critsect;
 
-    DECLARE_NO_COPY_CLASS(wxCriticalSectionLocker)
+    wxDECLARE_NO_COPY_CLASS(wxCriticalSectionLocker);
 };
 
 // ----------------------------------------------------------------------------
@@ -362,7 +364,7 @@ public:
 private:
     wxConditionInternal *m_internal;
 
-    DECLARE_NO_COPY_CLASS(wxCondition)
+    wxDECLARE_NO_COPY_CLASS(wxCondition);
 };
 
 #if WXWIN_COMPATIBILITY_2_6
@@ -407,7 +409,7 @@ public:
 private:
     wxSemaphoreInternal *m_internal;
 
-    DECLARE_NO_COPY_CLASS(wxSemaphore)
+    wxDECLARE_NO_COPY_CLASS(wxSemaphore);
 };
 
 // ----------------------------------------------------------------------------
@@ -445,14 +447,24 @@ public:
     static wxThread *This();
 
         // Returns true if current thread is the main thread.
-    static bool IsMain();
+        //
+        // Notice that it also returns true if main thread id hadn't been
+        // initialized yet on the assumption that it's too early in wx startup
+        // process for any other threads to have been created in this case.
+    static bool IsMain()
+    {
+        return !ms_idMainThread || GetCurrentId() == ms_idMainThread;
+    }
+
+        // Return the main thread id
+    static wxThreadIdType GetMainId() { return ms_idMainThread; }
 
         // Release the rest of our time slice letting the other threads run
     static void Yield();
 
         // Sleep during the specified period of time in milliseconds
         //
-        // NB: at least under MSW worker threads can not call ::wxSleep()!
+        // This is the same as wxMilliSleep().
     static void Sleep(unsigned long milliseconds);
 
         // get the number of system CPUs - useful with SetConcurrency()
@@ -464,7 +476,7 @@ public:
         // Get the platform specific thread ID and return as a long.  This
         // can be used to uniquely identify threads, even if they are not
         // wxThreads.  This is used by wxPython.
-   static wxThreadIdType GetCurrentId();
+    static wxThreadIdType GetCurrentId();
 
         // sets the concurrency level: this is, roughly, the number of threads
         // the system tries to schedule to run in parallel. 0 means the
@@ -504,7 +516,7 @@ public:
         // does it!
         //
         // will fill the rc pointer with the thread exit code if it's !NULL
-    wxThreadError Delete(ExitCode *rc = (ExitCode *)NULL);
+    wxThreadError Delete(ExitCode *rc = NULL);
 
         // waits for a joinable thread to finish and returns its exit code
         //
@@ -553,10 +565,8 @@ public:
     // identifies a thread inside a process
     wxThreadIdType GetId() const;
 
-    // called when the thread exits - in the context of this thread
-    //
-    // NB: this function will not be called if the thread is Kill()ed
-    virtual void OnExit() { }
+    wxThreadKind GetKind() const
+        { return m_isDetached ? wxTHREAD_DETACHED : wxTHREAD_JOINABLE; }
 
     // 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
@@ -580,7 +590,17 @@ private:
     wxThread(const wxThread&);
     wxThread& operator=(const wxThread&);
 
+    // called when the thread exits - in the context of this thread
+    //
+    // NB: this function will not be called if the thread is Kill()ed
+    virtual void OnExit() { }
+
     friend class wxThreadInternal;
+    friend class wxThreadModule;
+
+
+    // the main thread identifier, should be set on startup
+    static wxThreadIdType ms_idMainThread;
 
     // the (platform-dependent) thread class implementation
     wxThreadInternal *m_internal;
@@ -600,8 +620,8 @@ 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)
+    wxThreadHelperThread(wxThreadHelper& owner, wxThreadKind kind)
+        : wxThread(kind), m_owner(owner)
         { }
 
 protected:
@@ -628,27 +648,44 @@ class WXDLLIMPEXP_BASE wxThreadHelper
 private:
     void KillThread()
     {
+        // If wxThreadHelperThread is detached and is about to finish, it will
+        // set m_thread to NULL so don't delete it then.
+        // But if KillThread is called before wxThreadHelperThread (in detached mode)
+        // sets it to NULL, then the thread object still exists and can be killed
+        wxCriticalSectionLocker locker(m_critSection);
+
         if ( m_thread )
         {
             m_thread->Kill();
-            delete m_thread;
+
+            if ( m_kind == wxTHREAD_JOINABLE )
+              delete m_thread;
+
+            m_thread = NULL;
         }
     }
 
 public:
     // constructor only initializes m_thread to NULL
-    wxThreadHelper() : m_thread(NULL) { }
+    wxThreadHelper(wxThreadKind kind = wxTHREAD_JOINABLE)
+        : m_thread(NULL), m_kind(kind) { }
 
     // destructor deletes m_thread
     virtual ~wxThreadHelper() { KillThread(); }
 
+#if WXWIN_COMPATIBILITY_2_8
+    wxDEPRECATED( wxThreadError Create(unsigned int stackSize = 0) );
+#endif
+
     // 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)
+    wxThreadError CreateThread(wxThreadKind kind = wxTHREAD_JOINABLE,
+                               unsigned int stackSize = 0)
     {
         KillThread();
 
-        m_thread = new wxThreadHelperThread(*this);
+        m_kind = kind;
+        m_thread = new wxThreadHelperThread(*this, m_kind);
 
         return m_thread->Create(stackSize);
     }
@@ -658,16 +695,43 @@ public:
     virtual void *Entry() = 0;
 
     // returns a pointer to the thread which can be used to call Run()
-    wxThread *GetThread() const { return m_thread; }
+    wxThread *GetThread() const
+    {
+        wxCriticalSectionLocker locker((wxCriticalSection&)m_critSection);
+
+        wxThread* thread = m_thread;
+
+        return thread;
+    }
 
 protected:
     wxThread *m_thread;
+    wxThreadKind m_kind;
+    wxCriticalSection m_critSection; // To guard the m_thread variable
+
+    friend class wxThreadHelperThread;
 };
 
+#if WXWIN_COMPATIBILITY_2_8
+inline wxThreadError wxThreadHelper::Create(unsigned int stackSize)
+{ return CreateThread(m_kind, stackSize); }
+#endif
+
 // call Entry() in owner, put it down here to avoid circular declarations
 inline void *wxThreadHelperThread::Entry()
 {
-    return m_owner.Entry();
+    void * const result = m_owner.Entry();
+
+    wxCriticalSectionLocker locker(m_owner.m_critSection);
+
+    // Detached thread will be deleted after returning, so make sure
+    // wxThreadHelper::GetThread will not return an invalid pointer.
+    // And that wxThreadHelper::KillThread will not try to kill
+    // an already deleted thread
+    if ( m_owner.m_kind == wxTHREAD_DETACHED )
+        m_owner.m_thread = NULL;
+
+    return result;
 }
 
 // ----------------------------------------------------------------------------
@@ -698,11 +762,14 @@ inline void 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)
+// (the implementation uses dummy structs to force semicolon after the macro;
+// also notice that Watcom doesn't like declaring a struct as a member so we
+// need to actually define it in wxCRIT_SECT_DECLARE_MEMBER)
+#define wxENTER_CRIT_SECT(cs)            do {} while (0)
+#define wxLEAVE_CRIT_SECT(cs)            do {} while (0)
+#define wxCRIT_SECT_DECLARE(cs)          struct wxDummyCS##cs
+#define wxCRIT_SECT_DECLARE_MEMBER(cs)   struct wxDummyCSMember##cs { }
+#define wxCRIT_SECT_LOCKER(name, cs)     struct wxDummyCSLocker##name
 
 // if there is only one thread, it is always the main one
 inline bool wxIsMainThread() { return true; }
@@ -744,7 +811,7 @@ public:
 
 #if wxUSE_THREADS
 
-#if defined(__WXMSW__) || defined(__WXMAC__) || defined(__OS2__) || defined(__EMX__)
+#if defined(__WXMSW__) || defined(__OS2__) || 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
@@ -759,7 +826,7 @@ public:
     // return true if the main thread is waiting for some other to terminate:
     // wxApp then should block all "dangerous" messages
     extern bool WXDLLIMPEXP_BASE wxIsWaitingForThread();
-#endif // MSW, Mac, OS/2
+#endif // MSW, OS/2
 
 #endif // wxUSE_THREADS