1 files changed, 49 insertions, 15 deletions

diff --git a/intl/textdomain.c b/intl/textdomain.c
index 5dd4003a8e..726b5bb8e3 100644
--- a/intl/textdomain.c
+++ b/intl/textdomain.c
@@ -1,8 +1,5 @@
 /* Implementation of the textdomain(3) function.
-   Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
-
-   This file is part of the GNU C Library.  Its master source is NOT part of
-   the C library, however.  The master source lives in /gd/gnu/lib.
+   Copyright (C) 1995, 1996, 1997, 1998, 2000 Free Software Foundation, Inc.
 
    The GNU C Library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public License as
@@ -41,6 +38,18 @@
 #else
 # include "libgettext.h"
 #endif
+#include "gettext.h"
+#include "gettextP.h"
+
+#ifdef _LIBC
+/* We have to handle multi-threaded applications.  */
+# include <bits/libc-lock.h>
+#else
+/* Provide dummy implementation if this is outside glibc.  */
+# define __libc_lock_define_initialized (CLASS, NAME)
+# define __libc_lock_lock(NAME)
+# define __libc_lock_unlock(NAME)
+#endif
 
 /* @@ end of prolog @@ */
 
@@ -64,6 +73,9 @@ extern const char *_nl_current_default_domain;
 # define TEXTDOMAIN textdomain__
 #endif
 
+/* Lock variable to protect the global data in the gettext implementation.  */
+__libc_rwlock_define (extern, _nl_state_lock)
+
 /* Set the current default message catalog to DOMAINNAME.
    If DOMAINNAME is null, return the current default.
    If DOMAINNAME is "", reset to the default of "messages".  */
@@ -71,38 +83,60 @@ char *
 TEXTDOMAIN (domainname)
      const char *domainname;
 {
-  char *old;
+  char *new_domain;
+  char *old_domain;
 
   /* A NULL pointer requests the current setting.  */
   if (domainname == NULL)
     return (char *) _nl_current_default_domain;
 
-  old = (char *) _nl_current_default_domain;
+  __libc_rwlock_wrlock (_nl_state_lock);
+
+  old_domain = (char *) _nl_current_default_domain;
 
   /* If domain name is the null string set to default domain "messages".  */
   if (domainname[0] == '\0'
       || strcmp (domainname, _nl_default_default_domain) == 0)
-    _nl_current_default_domain = _nl_default_default_domain;
+    {
+      _nl_current_default_domain = _nl_default_default_domain;
+      new_domain = (char *) _nl_current_default_domain;
+    }
+  else if (strcmp (domainname, old_domain) == 0)
+    /* This can happen and people will use it to signal that some
+       environment variable changed.  */
+    new_domain = old_domain;
   else
     {
       /* If the following malloc fails `_nl_current_default_domain'
 	 will be NULL.  This value will be returned and so signals we
 	 are out of core.  */
 #if defined _LIBC || defined HAVE_STRDUP
-      _nl_current_default_domain = strdup (domainname);
+      new_domain = strdup (domainname);
 #else
       size_t len = strlen (domainname) + 1;
-      char *cp = (char *) malloc (len);
-      if (cp != NULL)
-	memcpy (cp, domainname, len);
-      _nl_current_default_domain = cp;
+      new_domain = (char *) malloc (len);
+      if (new_domain != NULL)
+	memcpy (new_domain, domainname, len);
 #endif
+
+      if (new_domain != NULL)
+	_nl_current_default_domain = new_domain;
+    }
+
+  /* We use this possibility to signal a change of the loaded catalogs
+     since this is most likely the case and there is no other easy we
+     to do it.  Do it only when the call was successful.  */
+  if (new_domain != NULL)
+    {
+      ++_nl_msg_cat_cntr;
+
+      if (old_domain != new_domain && old_domain != _nl_default_default_domain)
+	free (old_domain);
     }
 
-  if (old != _nl_default_default_domain)
-    free (old);
+  __libc_rwlock_unlock (_nl_state_lock);
 
-  return (char *) _nl_current_default_domain;
+  return new_domain;
 }
 
 #ifdef _LIBC