Added support for wxEXEC_MAKE_GROUP_LEADER to wxExecute().

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

diff --git a/include/wx/thread.h b/include/wx/thread.h
index fc0ac2759c1bb6ceadf1bdbf1a821634707ffff9..9718c3998e7848c3ce79b1adab7d5e1130af4314 100644 (file)
--- a/include/wx/thread.h
+++ b/include/wx/thread.h
@@ -71,6 +71,21 @@ enum wxThreadKind
     wxTHREAD_JOINABLE
 };
 
+enum wxThreadWait
+{
+    wxTHREAD_WAIT_BLOCK,
+    wxTHREAD_WAIT_YIELD,       // process events while waiting; MSW only
+
+    // For compatibility reasons we use wxTHREAD_WAIT_YIELD by default as this
+    // was the default behaviour of wxMSW 2.8 but it should be avoided as it's
+    // dangerous and not portable.
+#if WXWIN_COMPATIBILITY_2_8
+    wxTHREAD_WAIT_DEFAULT = wxTHREAD_WAIT_YIELD
+#else
+    wxTHREAD_WAIT_DEFAULT = wxTHREAD_WAIT_BLOCK
+#endif
+};
+
 // defines the interval of priority
 enum
 {
@@ -234,6 +249,9 @@ public:
     // enter the section (the same as locking a mutex)
     wxCRITSECT_INLINE void Enter();
 
+    // try to enter the section (the same as trying to lock a mutex)
+    wxCRITSECT_INLINE bool TryEnter();
+
     // leave the critical section (same as unlocking a mutex)
     wxCRITSECT_INLINE void Leave();
 
@@ -276,6 +294,7 @@ private:
     inline wxCriticalSection::~wxCriticalSection() { }
 
     inline void wxCriticalSection::Enter() { (void)m_mutex.Lock(); }
+    inline bool wxCriticalSection::TryEnter() { return m_mutex.TryLock() == wxMUTEX_NO_ERROR; }
     inline void wxCriticalSection::Leave() { (void)m_mutex.Unlock(); }
 #endif // wxCRITSECT_IS_MUTEX
 
@@ -447,7 +466,17 @@ 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();
@@ -466,7 +495,7 @@ 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
@@ -506,13 +535,14 @@ public:
         // does it!
         //
         // will fill the rc pointer with the thread exit code if it's !NULL
-    wxThreadError Delete(ExitCode *rc = NULL);
+    wxThreadError Delete(ExitCode *rc = NULL,
+                         wxThreadWait waitMode = wxTHREAD_WAIT_DEFAULT);
 
         // waits for a joinable thread to finish and returns its exit code
         //
         // Returns (ExitCode)-1 on error (for example, if the thread is not
         // joinable)
-    ExitCode Wait();
+    ExitCode Wait(wxThreadWait waitMode = wxTHREAD_WAIT_DEFAULT);
 
         // kills the thread without giving it any chance to clean up - should
         // not be used under normal circumstances, use Delete() instead.
@@ -575,6 +605,19 @@ protected:
     // of this thread.
     virtual void *Entry() = 0;
 
+
+    // Callbacks which may be overridden by the derived class to perform some
+    // specific actions when the thread is deleted or killed. By default they
+    // do nothing.
+
+    // This one is called by Delete() before actually deleting the thread and
+    // is executed in the context of the thread that called Delete().
+    virtual void OnDelete() {}
+
+    // This one is called by Kill() before killing the thread and is executed
+    // in the context of the thread that called Kill().
+    virtual void OnKill() {}
+
 private:
     // no copy ctor/assignment operator
     wxThread(const wxThread&);
@@ -586,6 +629,11 @@ private:
     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;
@@ -747,11 +795,13 @@ inline void wxMutexGuiLeave() { }
 
 // macros for entering/leaving critical sections which may be used without
 // having to take them inside "#if wxUSE_THREADS"
-// (the implementation uses dummy structs to force semicolon after the macro)
+// (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_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
@@ -794,7 +844,7 @@ public:
 
 #if wxUSE_THREADS
 
-#if defined(__WXMSW__) || defined(__OS2__) || defined(__EMX__)
+#if defined(__WXMSW__) || defined(__OS2__) || defined(__EMX__) || defined(__WXOSX__)
     // 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
@@ -806,9 +856,11 @@ public:
     // wakes up the main thread if it's sleeping inside ::GetMessage()
     extern void WXDLLIMPEXP_BASE wxWakeUpMainThread();
 
+#ifndef __WXOSX__
     // 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
 #endif // MSW, OS/2
 
 #endif // wxUSE_THREADS