added intospection variable to determine if the interp was compiled with threads enabled

2 files changed, 20 insertions, 1 deletions

diff --git a/ChangeLog b/ChangeLog
index c2ffe14..f2f9e7d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+1999-05-14    <surles@scriptics.com>
+
+	* generic/tclBasic.c (Tcl_CreateInterp): Added introspection
+	variable for threaded interps.  If the interp was compiled with
+	threads enabled, the tcl_platform(threaded) variable will exist.
+
 1999-05-14    <redman@scriptics.com>
 
 	* generic/tclDate.c: Applied patch to fix 100-year and 400-year
diff --git a/generic/tclBasic.c b/generic/tclBasic.c
index 10d8311..8de3a0d 100644
--- a/generic/tclBasic.c
+++ b/generic/tclBasic.c
@@ -12,7 +12,7 @@
  * See the file "license.terms" for information on usage and redistribution
  * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
  *
- * RCS: @(#) $Id: tclBasic.c,v 1.20 1999/05/13 01:50:32 stanton Exp $
+ * RCS: @(#) $Id: tclBasic.c,v 1.21 1999/05/14 23:16:54 surles Exp $
  */
 
 #include "tclInt.h"
@@ -529,6 +529,19 @@ Tcl_CreateInterp()
 	    TclPrecTraceProc, (ClientData) NULL);
     TclpSetVariables(interp);
 
+#ifdef TCL_THREADS
+    /*
+     * The existence of the "threaded" element of the tcl_platform array indicates
+     * that this particular Tcl shell has been compiled with threads turned on.
+     * Using "info exists tcl_platform(threaded)" a Tcl script can introspect on the 
+     * interpreter level of thread safety.
+     */
+
+
+    Tcl_SetVar2(interp, "tcl_platform", "threaded", "1",
+	    TCL_GLOBAL_ONLY);
+#endif
+
     /*
      * Register Tcl's version number.
      */