Re: Linking to cygwin1.dll and msvcrt.dll ?

[Mumit Khan <khan@NanoTech.Wisc.EDU>]

On Tue, 17 Jul 2001, Christopher Faylor wrote:

> On Tue, Jul 17, 2001 at 12:59:46PM -0700, Mo DeJong wrote:
> >I am trying to figure out how to create a .dll that depends on
> >cygwin1.dll and msvcrt.dll.  Here is the link time error I am currently
> >seeing:
> 
> You can't do that.  You can't mix two different runtime systems
> they are mutually exclusive.


In this particular case however, you need to replace _beginthreadex and
_endthreadex with Windows32 API "equivalents" -- Create/EndThread. Here's
the bit from my local tree, based on tcl 8.3. Caveat noted in the source.

2000-02-22  Mumit Khan  <khan@xraylith.wisc.edu>
	
	* win/tclWinThrd.c (TclpThreadCreate): Conditionalize on 
	TCL_THREADS. Add workaround for lack of _beginthreadex under 
	CRTDLL runtime. 
	(TclpThreadExit): Likewise.

Index: win/tclWinThrd.c
===================================================================
RCS file: /homes/khan/src/CVSROOT/tcl8.3.0/win/tclWinThrd.c,v
retrieving revision 1.1.1.1
retrieving revision 1.3
diff -u -3 -p -r1.1.1.1 -r1.3
--- win/tclWinThrd.c	2000/02/16 21:47:46	1.1.1.1
+++ win/tclWinThrd.c	2000/02/22 04:15:06	1.3
@@ -120,15 +120,31 @@ TclpThreadCreate(idPtr, proc, clientData
     Tcl_ThreadCreateProc proc;		/* Main() function of the thread */
     ClientData clientData;		/* The one argument to Main() */
 {
+#ifdef TCL_THREADS
     unsigned long code;
 
+#if !defined(__GNUC__) || (defined(__GNUC__) && defined(__MSVCRT__))
     code = _beginthreadex(NULL, 0, (LPTHREAD_START_ROUTINE) proc,
 		(void *)clientData, 0, (unsigned *)idPtr);
+#else
+    /* 
+     * MS CRTDLL runtime, one of two supported GCC/Mingw, does not support 
+     * the _beginthreadex and endthreadex interfaces, and we resort to using
+     * Win32 API CreateThread and ExitThread interfaces instead. A side 
+     * effect is that there is a potential resource leak after each thread 
+     * exits. 
+     */
+    code = (unsigned long) CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE) proc,
+		(DWORD *)clientData, 0, (DWORD *)idPtr);
+#endif
     if (code == 0) {
 	return TCL_ERROR;
     } else {
 	return TCL_OK;
     }
+#else
+    return TCL_ERROR;
+#endif
 }
 \f
 /*
@@ -151,7 +167,13 @@ void
 TclpThreadExit(status)
     int status;
 {
+#ifdef TCL_THREADS
+#if !defined(__GNUC__) || (defined(__GNUC__) && defined(__MSVCRT__))
     _endthreadex((DWORD)status);
+#else
+    ExitThread((DWORD)status);
+#endif
+#endif
 }
 
 \f

Regards,
Mumit



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