another segfault fix

[wxWidgets.git] / src / msw / thread.cpp

diff --git a/src/msw/thread.cpp b/src/msw/thread.cpp
index a743d287b0cb27022a5b22c57627ab87546461f9..ab8030e5840c1c0e0ed557f4ebf8783b3b465e90 100644 (file)
--- a/src/msw/thread.cpp
+++ b/src/msw/thread.cpp
@@ -45,21 +45,42 @@
     #define _MT
 #endif
 
+#if defined(__BORLANDC__)
+    #if !defined(__MT__)
+        // I can't set -tWM in the IDE (anyone?) so have to do this
+        #define __MT__
+    #endif
+
+    #if !defined(__MFC_COMPAT__)
+        // Needed to know about _beginthreadex etc..
+        #define __MFC_COMPAT__
+    #endif
+#endif // BC++
+
+// define wxUSE_BEGIN_THREAD if the compiler has _beginthreadex() function
+// which should be used instead of Win32 ::CreateThread() if possible
 #if defined(__VISUALC__) || \
     (defined(__BORLANDC__) && (__BORLANDC__ >= 0x500)) || \
-    (defined(__GNUG__) && defined(__MSVCRT__))
-
-#if defined(__BORLANDC__) && !defined(__MT__)
-// I can't set -tWM in the IDE (anyone?) so have to do this
-#define __MT__
-#endif
+    (defined(__GNUG__) && defined(__MSVCRT__)) || \
+    defined(__WATCOMC__)
 
-#if defined(__BORLANDC__) && !defined(__MFC_COMPAT__)
-// Needed to know about _beginthreadex etc..
-#define __MFC_COMPAT__
+    #undef wxUSE_BEGIN_THREAD
+    #define wxUSE_BEGIN_THREAD
 #endif
 
+#ifdef wxUSE_BEGIN_THREAD
+    // this is where _beginthreadex() is declared
     #include <process.h>
+
+    // the return type of the thread function entry point
+    typedef unsigned THREAD_RETVAL;
+
+    // the calling convention of the thread function entry point
+    #define THREAD_CALLCONV __stdcall
+#else
+    // the settings for CreateThread()
+    typedef DWORD THREAD_RETVAL;
+    #define THREAD_CALLCONV WINAPI
 #endif
 
 // ----------------------------------------------------------------------------
@@ -327,8 +348,14 @@ void wxCondition::Broadcast()
 
 wxCriticalSection::wxCriticalSection()
 {
-    wxASSERT_MSG( sizeof(CRITICAL_SECTION) <= sizeof(m_buffer),
+#ifdef __WXDEBUG__
+    // Done this way to stop warnings during compilation about statement
+    // always being false
+        int csSize = sizeof(CRITICAL_SECTION);
+        int bSize  = sizeof(m_buffer);
+    wxASSERT_MSG( csSize <= bSize,
                   _T("must increase buffer size in wx/thread.h") );
+#endif
 
     ::InitializeCriticalSection((CRITICAL_SECTION *)m_buffer);
 }
@@ -404,7 +431,7 @@ public:
     DWORD  GetId() const { return m_tid; }
 
     // thread function
-    static DWORD WinThreadStart(wxThread *thread);
+    static THREAD_RETVAL THREAD_CALLCONV WinThreadStart(void *thread);
 
 private:
     HANDLE        m_hThread;    // handle of the thread
@@ -413,16 +440,17 @@ private:
     DWORD         m_tid;        // thread id
 };
 
-DWORD wxThreadInternal::WinThreadStart(wxThread *thread)
+THREAD_RETVAL THREAD_CALLCONV wxThreadInternal::WinThreadStart(void *param)
 {
-    DWORD rc;
+    THREAD_RETVAL rc;
     bool wasCancelled;
 
     // first of all, check whether we hadn't been cancelled already and don't
     // start the user code at all then
+    wxThread *thread = (wxThread *)param;
     if ( thread->m_internal->GetState() == STATE_EXITED )
     {
-        rc = (DWORD)-1;
+        rc = (THREAD_RETVAL)-1;
         wasCancelled = TRUE;
     }
     else // do run thread
@@ -435,7 +463,7 @@ DWORD wxThreadInternal::WinThreadStart(wxThread *thread)
             return (DWORD)-1;
         }
 
-        rc = (DWORD)thread->Entry();
+        rc = (THREAD_RETVAL)thread->Entry();
 
         // enter m_critsect before changing the thread state
         thread->m_critsect.Enter();
@@ -491,23 +519,26 @@ bool wxThreadInternal::Create(wxThread *thread)
     // for compilers which have it, we should use C RTL function for thread
     // creation instead of Win32 API one because otherwise we will have memory
     // leaks if the thread uses C RTL (and most threads do)
-#if defined(__VISUALC__) || \
-    (defined(__BORLANDC__) && (__BORLANDC__ >= 0x500)) || \
-    (defined(__GNUG__) && defined(__MSVCRT__))
-    typedef unsigned (__stdcall *RtlThreadStart)(void *);
-
-    m_hThread = (HANDLE)_beginthreadex(NULL, 0,
-                                       (RtlThreadStart)
-                                       wxThreadInternal::WinThreadStart,
-                                       thread, CREATE_SUSPENDED,
-                                       (unsigned int *)&m_tid);
+#ifdef wxUSE_BEGIN_THREAD
+    m_hThread = (HANDLE)_beginthreadex
+                        (
+                            NULL,   // default security
+#ifdef __WATCOMC__
+                            10240,  // stack size can't be NULL in Watcom
+#else
+                            0,      // default stack size
+#endif
+                            wxThreadInternal::WinThreadStart, // entry point
+                            thread,
+                            CREATE_SUSPENDED,
+                            (unsigned int *)&m_tid
+                        );
 #else // compiler doesn't have _beginthreadex
     m_hThread = ::CreateThread
                   (
                     NULL,                               // default security
                     0,                                  // default stack size
-                    (LPTHREAD_START_ROUTINE)            // thread entry point
-                    wxThreadInternal::WinThreadStart,   //
+                    wxThreadInternal::WinThreadStart,   // thread entry point
                     (LPVOID)thread,                     // parameter
                     CREATE_SUSPENDED,                   // flags
                     &m_tid                              // [out] thread id
@@ -979,9 +1010,7 @@ void wxThread::Exit(ExitCode status)
         delete this;
     }
 
-#if defined(__VISUALC__) || \
-    (defined(__BORLANDC__) && (__BORLANDC__ >= 0x500)) || \
-    (defined(__GNUG__) && defined(__MSVCRT__))
+#ifdef wxUSE_BEGIN_THREAD
     _endthreadex((unsigned)status);
 #else // !VC++
     ::ExitThread((DWORD)status);