* win/tclWinThrd.c: Applied SF patch #727271. This patch changes

	  the code to catch any errors returned by the windows functions
	  handling TLS ASAP instead of waiting to get some mysterious
	  crash later on due to bogus pointers. Patch provided by Joe
	  Mistachkin.

	  This is a stop-gap measure to deal with the low number of ?TLS
	  slots provided by some of the variants of Windows (60-80).

1 files changed, 54 insertions, 9 deletions

diff --git a/win/tclWinThrd.c b/win/tclWinThrd.c
index f0ee02c..494b060 100644
--- a/win/tclWinThrd.c
+++ b/win/tclWinThrd.c
@@ -9,7 +9,7 @@
  * See the file "license.terms" for information on usage and redistribution
  * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
  *
- * RCS: @(#) $Id: tclWinThrd.c,v 1.24 2003/01/14 02:06:11 mdejong Exp $
+ * RCS: @(#) $Id: tclWinThrd.c,v 1.25 2003/04/25 20:03:24 andreas_kupries Exp $
  */
 
 #include "tclWinInt.h"
@@ -539,11 +539,17 @@ TclpThreadDataKeyInit(keyPtr)
 				 * really (DWORD **) */
 {
     DWORD *indexPtr;
+    DWORD newKey;
 
     MASTER_LOCK;
     if (*keyPtr == NULL) {
 	indexPtr = (DWORD *)ckalloc(sizeof(DWORD));
-	*indexPtr = TlsAlloc();
+	newKey = TlsAlloc();
+        if (newKey != TLS_OUT_OF_INDEXES) {
+            *indexPtr = newKey;
+        } else {
+            panic("TlsAlloc failed from TclpThreadDataKeyInit!"); /* this should be a fatal error */
+        }
 	*keyPtr = (Tcl_ThreadDataKey)indexPtr;
 	TclRememberDataKey(keyPtr);
     }
@@ -573,10 +579,15 @@ TclpThreadDataKeyGet(keyPtr)
 				 * really (DWORD **) */
 {
     DWORD *indexPtr = *(DWORD **)keyPtr;
+    LPVOID result;
     if (indexPtr == NULL) {
 	return NULL;
     } else {
-	return (VOID *) TlsGetValue(*indexPtr);
+        result = TlsGetValue(*indexPtr);
+        if ((result == NULL) && (GetLastError() != NO_ERROR)) {
+            panic("TlsGetValue failed from TclpThreadDataKeyGet!");
+        }
+	return result;
     }
 }
 
@@ -604,7 +615,11 @@ TclpThreadDataKeySet(keyPtr, data)
     VOID *data;			/* Thread local storage */
 {
     DWORD *indexPtr = *(DWORD **)keyPtr;
-    TlsSetValue(*indexPtr, (void *)data);
+    BOOL success;
+    success = TlsSetValue(*indexPtr, (void *)data);
+    if (!success) {
+        panic("TlsSetValue failed from TclpThreadDataKeySet!");
+    }
 }
 
 /*
@@ -630,6 +645,7 @@ TclpFinalizeThreadData(keyPtr)
 {
     VOID *result;
     DWORD *indexPtr;
+    BOOL success;
 
 #ifdef USE_THREAD_ALLOC
     TclWinFreeAllocCache();
@@ -639,7 +655,14 @@ TclpFinalizeThreadData(keyPtr)
 	result = (VOID *)TlsGetValue(*indexPtr);
 	if (result != NULL) {
 	    ckfree((char *)result);
-	    TlsSetValue(*indexPtr, (void *)NULL);
+	    success = TlsSetValue(*indexPtr, (void *)NULL);
+            if (!success) {
+                panic("TlsSetValue failed from TclpFinalizeThreadData!");
+            }
+	} else {
+            if (GetLastError() != NO_ERROR) {
+                panic("TlsGetValue failed from TclpFinalizeThreadData!");
+            }
 	}
     }
 }
@@ -669,9 +692,13 @@ TclpFinalizeThreadDataKey(keyPtr)
     Tcl_ThreadDataKey *keyPtr;
 {
     DWORD *indexPtr;
+    BOOL success;
     if (*keyPtr != NULL) {
 	indexPtr = *(DWORD **)keyPtr;
-	TlsFree(*indexPtr);
+	success = TlsFree(*indexPtr);
+        if (!success) {
+            panic("TlsFree failed from TclpFinalizeThreadDataKey!");
+        }
 	ckfree((char *)indexPtr);
 	*keyPtr = NULL;
     }
@@ -1001,6 +1028,7 @@ void *
 TclpGetAllocCache(void)
 {
     static int once = 0;
+    VOID *result;
 
     if (!once) {
 	/*
@@ -1014,24 +1042,41 @@ TclpGetAllocCache(void)
 	    panic("could not allocate thread local storage");
 	}
     }
-    return TlsGetValue(key);
+
+    result = TlsGetValue(key);
+    if ((result == NULL) && (GetLastError() != NO_ERROR)) {
+        panic("TlsGetValue failed from TclpGetAllocCache!");
+    }
+    return result;
 }
 
 void
 TclpSetAllocCache(void *ptr)
 {
-    TlsSetValue(key, ptr);
+    BOOL success;
+    success = TlsSetValue(key, ptr);
+    if (!success) {
+        panic("TlsSetValue failed from TclpSetAllocCache!");
+    }
 }
 
 void
 TclWinFreeAllocCache(void)
 {
     void *ptr;
+    BOOL success;
 
     ptr = TlsGetValue(key);
     if (ptr != NULL) {
-	TlsSetValue(key, NULL);
+	success = TlsSetValue(key, NULL);
+        if (!success) {
+            panic("TlsSetValue failed from TclWinFreeAllocCache!");
+        }
 	TclFreeAllocCache(ptr);
+    } else {
+      if (GetLastError() != NO_ERROR) {
+          panic("TlsGetValue failed from TclWinFreeAllocCache!");
+      }
     }
 }