* sysdeps/pthread/bits/libc-tsd.h: Include <tls.h>.

	[USE_TLS && HAVE___THREAD]: Just include the sysdeps/generic file,
	which does the right thing when __thread support is available.
	* descr.h (struct _pthread_descr_struct) [USE_TLS && HAVE___THREAD]:
	Omit `p_libc_specific', `p_errnop', `p_errno', `p_h_errnop',
	`p_h_errno', `p_resp', and `p_res' members.
	* pthread.c (__pthread_initialize_minimal) [USE_TLS && HAVE___THREAD]:
	Don't initialize `p_errnop' and `p_h_errnop' members.
	(__pthread_reset_main_thread): Likewise.
	(__pthread_initialize_manager): Likewise.
	* manager.c (__pthread_manager, pthread_handle_create): Likewise.
	* pthread.c (pthread_initialize) [USE_TLS && HAVE___THREAD]:
	Don't initialize `p_resp' member.
	(__pthread_reset_main_thread): Likewise.
	* manager.c (pthread_handle_create): Likewise.
	* specific.c (libc_internal_tsd_set, libc_internal_tsd_get):
	Conditionalize these on [!(USE_TLS && HAVE___THREAD)].
	* errno.c [USE_TLS && HAVE___THREAD]
	(__h_errno_location, __res_state): Don't define these at all.

	* sysdeps/i386/tls.h (INSTALL_DTV): Add parens around arguments!
	(INSTALL_NEW_DTV, GET_DTV): Likewise.
	* sysdeps/sh/tls.h (INSTALL_DTV, INSTALL_NEW_DTV, GET_DTV): Likewise.

	* weaks.c: Don't include <errno.h> here.

2002-08-01  Roland McGrath  <roland@redhat.com>

	* sysdeps/i386/tls.h (TLS_DO_MODIFY_LDT): New macro, broken out of
	TLS_INIT_TP.
	(TLS_DO_SET_THREAD_AREA): New macro, uses thread_set_area syscall.
	(TLS_SETUP_GS_SEGMENT): New macro, try one or the other or both.
	(TLS_INIT_TP): Use that.

26 files changed, 227 insertions, 101 deletions

diff --git a/bits/libc-tsd.h b/bits/libc-tsd.h
index 80bd1d33dc..fc17be108e 100644
--- a/bits/libc-tsd.h
+++ b/bits/libc-tsd.h
@@ -1,5 +1,5 @@
-/* libc-internal interface for thread-specific data.  Stub version.
-   Copyright (C) 1998, 2001 Free Software Foundation, Inc.
+/* libc-internal interface for thread-specific data.  Stub or TLS version.
+   Copyright (C) 1998,2001,02 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -17,8 +17,8 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-#ifndef _BITS_LIBC_TSD_H
-#define _BITS_LIBC_TSD_H 1
+#ifndef _GENERIC_BITS_LIBC_TSD_H
+#define _GENERIC_BITS_LIBC_TSD_H 1
 
 /* This file defines the following macros for accessing a small fixed
    set of thread-specific `void *' data used only internally by libc.
@@ -40,13 +40,22 @@
    Some implementations may not provide any enum at all and instead
    using string pasting in the macros.  */
 
-/* This is the generic/stub implementation for wholly single-threaded
-   systems.  We don't define an enum for the possible key values, because
-   the KEYs translate directly into variables by macro magic.  */
+#include <tls.h>
 
-#define __libc_tsd_define(CLASS, KEY)	CLASS void *__libc_tsd_##KEY##_data;
-#define __libc_tsd_get(KEY)		(__libc_tsd_##KEY##_data)
-#define __libc_tsd_set(KEY, VALUE)	(__libc_tsd_##KEY##_data = (VALUE))
+/* When full support for __thread variables is available, this interface is
+   just a trivial wrapper for it.  Without TLS, this is the generic/stub
+   implementation for wholly single-threaded systems.
 
+   We don't define an enum for the possible key values, because the KEYs
+   translate directly into variables by macro magic.  */
+
+#if USE_TLS && HAVE___THREAD
+# define __libc_tsd_define(CLASS, KEY)	CLASS __thread void *__libc_tsd_##KEY;
+#else
+# define __libc_tsd_define(CLASS, KEY)	CLASS void *__libc_tsd_##KEY;
+#endif
+
+#define __libc_tsd_get(KEY)		(__libc_tsd_##KEY)
+#define __libc_tsd_set(KEY, VALUE)	(__libc_tsd_##KEY = (VALUE))
 
 #endif	/* bits/libc-tsd.h */
diff --git a/elf/dl-load.c b/elf/dl-load.c
index 0948b8f21e..2955bc5173 100644
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -1166,8 +1166,8 @@ _dl_map_object_from_fd (const char *name, int fd, struct filebuf *fbp,
 
   elf_get_dynamic_info (l);
 
-  /* Make sure we are dlopen()ing an object which has the DF_1_NOOPEN
-     flag set.  */
+  /* Make sure we are not dlopen'ing an object
+     that has the DF_1_NOOPEN flag set.  */
   if ((__builtin_expect (l->l_flags_1 & DF_1_NOOPEN, 0)
 #ifdef USE_TLS
        || __builtin_expect (l->l_flags & DF_STATIC_TLS, 0)
@@ -1861,7 +1861,7 @@ cannot create shared object descriptor"));
 	}
       else
 	INTUSE(_dl_signal_error) (errno, name, NULL,
-			       N_("cannot open shared object file"));
+				  N_("cannot open shared object file"));
     }
 
   return _dl_map_object_from_fd (name, fd, &fb, realname, loader, type, mode);
diff --git a/include/errno.h b/include/errno.h
index 35f705100e..9969b1f519 100644
--- a/include/errno.h
+++ b/include/errno.h
@@ -1,13 +1,20 @@
+#ifndef _ERRNO_H
+
 #include <stdlib/errno.h>
 
 #ifdef _ERRNO_H
 
-#if USE_TLS && HAVE___THREAD
-# undef errno
+# include <tls.h>		/* Defines USE_TLS.  */
+
+# if USE_TLS && HAVE___THREAD
+#  undef  errno
+#  define errno errno		/* For #ifndef errno tests.  */
 extern __thread int errno;
-# define __set_errno(val) (errno = (val))
-#else
-# define __set_errno(val) (*__errno_location ()) = (val)
-#endif
+#  define __set_errno(val) (errno = (val))
+# else
+#  define __set_errno(val) (*__errno_location ()) = (val)
+# endif
+
+#endif /* _ERRNO_H */
 
-#endif
+#endif /* ! _ERRNO_H */
diff --git a/include/netdb.h b/include/netdb.h
index 0a97c01a3e..1f2ab032e2 100644
--- a/include/netdb.h
+++ b/include/netdb.h
@@ -1,6 +1,26 @@
 #ifndef	_NETDB_H
 #include <resolv/netdb.h>
 
+/* Macros for accessing h_errno from inside libc.  */
+# ifdef _LIBC_REENTRANT
+#  include <tls.h>
+#  if USE_TLS && HAVE___THREAD
+#   undef  h_errno
+#   define h_errno h_errno	/* For #ifndef h_errno tests.  */
+extern __thread int h_errno;
+#   define __set_h_errno(x)	(h_errno = (x))
+#  else
+static inline int
+__set_h_errno (int __err)
+{
+  return *__h_errno_location () = __err;
+}
+#  endif
+# else
+#  undef  h_errno
+#  define __set_h_errno(x) (h_errno = (x))
+# endif	/* _LIBC_REENTRANT */
+
 /* Document internal interfaces.  */
 extern int __gethostent_r (struct hostent *__restrict __result_buf,
 			   char *__restrict __buf, size_t __buflen,
diff --git a/include/resolv.h b/include/resolv.h
index d4a531f244..6d7008b81a 100644
--- a/include/resolv.h
+++ b/include/resolv.h
@@ -11,6 +11,19 @@
 #include <resolv/resolv.h>
 
 #ifdef _RESOLV_H_
+
+# ifdef _LIBC_REENTRANT
+#  include <tls.h>
+#  if USE_TLS && HAVE___THREAD
+#   undef _res
+extern __thread struct __res_state _res;
+#  endif
+# else
+#  ifndef __BIND_NOSTATIC
+extern struct __res_state _res;
+#  endif
+# endif
+
 /* Now define the internal interfaces.  */
 extern int __res_vinit (res_state, int);
 extern void _sethtent (int);
diff --git a/inet/herrno.c b/inet/herrno.c
index 1a30ce971d..165762bdba 100644
--- a/inet/herrno.c
+++ b/inet/herrno.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
+/* Copyright (C) 1996,97,98,2002 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -20,12 +20,19 @@
 #include <netdb.h>
 #undef h_errno
 
+#include <tls.h>
+
 /* We need to have the error status variable of the resolver
    accessible in the libc.  */
+
+#if USE_TLS && HAVE___THREAD
+__thread int h_errno;
+#else
 int h_errno = 0;
 weak_alias (h_errno, _h_errno)
+#endif
 
-/* When threaded, h_errno may be a per-process variable.  */
+/* When threaded, h_errno may be a per-thread variable.  */
 int *
 weak_const_function
 __h_errno_location (void)
diff --git a/intl/loadmsgcat.c b/intl/loadmsgcat.c
index ec7891f8c5..19a3e9b8e5 100644
--- a/intl/loadmsgcat.c
+++ b/intl/loadmsgcat.c
@@ -35,6 +35,7 @@
 #include <sys/stat.h>
 
 #ifdef __GNUC__
+# undef  alloca
 # define alloca __builtin_alloca
 # define HAVE_ALLOCA 1
 #else
diff --git a/linuxthreads/ChangeLog b/linuxthreads/ChangeLog
index 2baa1e4a9e..30917d367d 100644
--- a/linuxthreads/ChangeLog
+++ b/linuxthreads/ChangeLog
@@ -1,3 +1,39 @@
+2002-07-30  Roland McGrath  <roland@redhat.com>
+
+	* sysdeps/pthread/bits/libc-tsd.h: Include <tls.h>.
+	[USE_TLS && HAVE___THREAD]: Just include the sysdeps/generic file,
+	which does the right thing when __thread support is available.
+	* descr.h (struct _pthread_descr_struct) [USE_TLS && HAVE___THREAD]:
+	Omit `p_libc_specific', `p_errnop', `p_errno', `p_h_errnop',
+	`p_h_errno', `p_resp', and `p_res' members.
+	* pthread.c (__pthread_initialize_minimal) [USE_TLS && HAVE___THREAD]:
+	Don't initialize `p_errnop' and `p_h_errnop' members.
+	(__pthread_reset_main_thread): Likewise.
+	(__pthread_initialize_manager): Likewise.
+	* manager.c (__pthread_manager, pthread_handle_create): Likewise.
+	* pthread.c (pthread_initialize) [USE_TLS && HAVE___THREAD]:
+	Don't initialize `p_resp' member.
+	(__pthread_reset_main_thread): Likewise.
+	* manager.c (pthread_handle_create): Likewise.
+	* specific.c (libc_internal_tsd_set, libc_internal_tsd_get):
+	Conditionalize these on [!(USE_TLS && HAVE___THREAD)].
+	* errno.c [USE_TLS && HAVE___THREAD]
+	(__h_errno_location, __res_state): Don't define these at all.
+
+	* sysdeps/i386/tls.h (INSTALL_DTV): Add parens around arguments!
+	(INSTALL_NEW_DTV, GET_DTV): Likewise.
+	* sysdeps/sh/tls.h (INSTALL_DTV, INSTALL_NEW_DTV, GET_DTV): Likewise.
+
+	* weaks.c: Don't include <errno.h> here.
+
+2002-08-01  Roland McGrath  <roland@redhat.com>
+
+	* sysdeps/i386/tls.h (TLS_DO_MODIFY_LDT): New macro, broken out of
+	TLS_INIT_TP.
+	(TLS_DO_SET_THREAD_AREA): New macro, uses thread_set_area syscall.
+	(TLS_SETUP_GS_SEGMENT): New macro, try one or the other or both.
+	(TLS_INIT_TP): Use that.
+
 2002-08-02  Jakub Jelinek  <jakub@redhat.com>
 
 	* sysdeps/i386/useldt.h (DO_MODIFY_LDT): Move from INIT_THREAD_SELF.
diff --git a/linuxthreads/descr.h b/linuxthreads/descr.h
index d0c31da9b2..cc64cbc8aa 100644
--- a/linuxthreads/descr.h
+++ b/linuxthreads/descr.h
@@ -130,15 +130,19 @@ struct _pthread_descr_struct {
   char p_cancelstate;           /* cancellation state */
   char p_canceltype;            /* cancellation type (deferred/async) */
   char p_canceled;              /* cancellation request pending */
-  int * p_errnop;               /* pointer to used errno variable */
-  int p_errno;                  /* error returned by last system call */
-  int * p_h_errnop;             /* pointer to used h_errno variable */
-  int p_h_errno;                /* error returned by last netdb function */
   char * p_in_sighandler;       /* stack address of sighandler, or NULL */
   char p_sigwaiting;            /* true if a sigwait() is in progress */
   struct pthread_start_args p_start_args; /* arguments for thread creation */
   void ** p_specific[PTHREAD_KEY_1STLEVEL_SIZE]; /* thread-specific data */
+#if !(USE_TLS && HAVE___THREAD)
   void * p_libc_specific[_LIBC_TSD_KEY_N]; /* thread-specific data for libc */
+  int * p_errnop;               /* pointer to used errno variable */
+  int p_errno;                  /* error returned by last system call */
+  int * p_h_errnop;             /* pointer to used h_errno variable */
+  int p_h_errno;                /* error returned by last netdb function */
+  struct __res_state *p_resp;	/* Pointer to resolver state */
+  struct __res_state p_res;	/* per-thread resolver state */
+#endif
   int p_userstack;		/* nonzero if the user provided the stack */
   void *p_guardaddr;		/* address of guard area or NULL */
   size_t p_guardsize;		/* size of guard area */
@@ -154,8 +158,6 @@ struct _pthread_descr_struct {
   pthread_readlock_info *p_readlock_list;  /* List of readlock info structs */
   pthread_readlock_info *p_readlock_free;  /* Free list of structs */
   int p_untracked_readlock_count;	/* Readlocks not tracked by list */
-  struct __res_state *p_resp;	/* Pointer to resolver state */
-  struct __res_state p_res;	/* per-thread resolver state */
   int p_inheritsched;           /* copied from the thread attribute */
 #if HP_TIMING_AVAIL
   hp_timing_t p_cpuclock_offset; /* Initial CPU clock for thread.  */
diff --git a/linuxthreads/errno.c b/linuxthreads/errno.c
index c74e4c45c9..57b1ebb635 100644
--- a/linuxthreads/errno.c
+++ b/linuxthreads/errno.c
@@ -28,7 +28,6 @@ int * __errno_location()
   pthread_descr self = thread_self();
   return THREAD_GETMEM (self, p_errnop);
 }
-#endif
 
 int * __h_errno_location()
 {
@@ -42,3 +41,4 @@ struct __res_state * __res_state()
   pthread_descr self = thread_self();
   return THREAD_GETMEM (self, p_resp);
 }
+#endif
diff --git a/linuxthreads/manager.c b/linuxthreads/manager.c
index 1b84fb720d..11588fbb21 100644
--- a/linuxthreads/manager.c
+++ b/linuxthreads/manager.c
@@ -138,9 +138,11 @@ __pthread_manager(void *arg)
 #ifdef INIT_THREAD_SELF
   INIT_THREAD_SELF(self, 1);
 #endif
+#if !(USE_TLS && HAVE___THREAD)
   /* Set the error variable.  */
   self->p_errnop = &self->p_errno;
   self->p_h_errnop = &self->p_h_errno;
+#endif
   /* Block all signals except __pthread_sig_cancel and SIGTRAP */
   sigfillset(&manager_mask);
   sigdelset(&manager_mask, __pthread_sig_cancel); /* for thread termination */
@@ -640,9 +642,11 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr,
   new_thread->p_lock = &(__pthread_handles[sseg].h_lock);
   new_thread->p_cancelstate = PTHREAD_CANCEL_ENABLE;
   new_thread->p_canceltype = PTHREAD_CANCEL_DEFERRED;
+#if !(USE_TLS && HAVE___THREAD)
   new_thread->p_errnop = &new_thread->p_errno;
   new_thread->p_h_errnop = &new_thread->p_h_errno;
   new_thread->p_resp = &new_thread->p_res;
+#endif
   new_thread->p_guardaddr = guardaddr;
   new_thread->p_guardsize = guardsize;
   new_thread->p_header.data.self = new_thread;
diff --git a/linuxthreads/pthread.c b/linuxthreads/pthread.c
index 8bca63e201..3c978a5bc0 100644
--- a/linuxthreads/pthread.c
+++ b/linuxthreads/pthread.c
@@ -33,27 +33,28 @@
 #include <ldsodefs.h>
 #include <tls.h>
 
-/* We need the global/static resolver state here.  */
-#include <resolv.h>
-#undef _res
-
-extern struct __res_state _res;
-
 /* Sanity check.  */
 #if __ASSUME_REALTIME_SIGNALS && !defined __SIGRTMIN
 # error "This must not happen; new kernel assumed but old headers"
 #endif
 
-/* These variables are used by the setup code.  */
-extern int _errno;
-extern int _h_errno;
-
 #ifdef USE_TLS
 
 /* We need only a few variables.  */
 static pthread_descr manager_thread;
 
 #else
+
+/* These variables are used by the setup code.  */
+extern int _errno;
+extern int _h_errno;
+
+/* We need the global/static resolver state here.  */
+#include <resolv.h>
+#undef _res
+
+extern struct __res_state _res;
+
 /* Descriptor of the initial thread */
 
 struct _pthread_descr_struct __pthread_initial_thread = {
@@ -83,16 +84,18 @@ struct _pthread_descr_struct __pthread_initial_thread = {
   0,                          /* char p_cancelstate */
   0,                          /* char p_canceltype */
   0,                          /* char p_canceled */
-  &_errno,                    /* int *p_errnop */
-  0,                          /* int p_errno */
-  &_h_errno,                  /* int *p_h_errnop */
-  0,                          /* int p_h_errno */
   NULL,                       /* char * p_in_sighandler */
   0,                          /* char p_sigwaiting */
   PTHREAD_START_ARGS_INITIALIZER(NULL),
                               /* struct pthread_start_args p_start_args */
   {NULL},                     /* void ** p_specific[PTHREAD_KEY_1STLEVEL_SIZE] */
   {NULL},                     /* void * p_libc_specific[_LIBC_TSD_KEY_N] */
+  &_errno,                    /* int *p_errnop */
+  0,                          /* int p_errno */
+  &_h_errno,                  /* int *p_h_errnop */
+  0,                          /* int p_h_errno */
+  &_res,		      /* struct __res_state *p_resp */
+  {},			      /* struct __res_state p_res */
   1,                          /* int p_userstack */
   NULL,                       /* void * p_guardaddr */
   0,                          /* size_t p_guardsize */
@@ -141,16 +144,18 @@ struct _pthread_descr_struct __pthread_manager_thread = {
   0,                          /* char p_cancelstate */
   0,                          /* char p_canceltype */
   0,                          /* char p_canceled */
-  &__pthread_manager_thread.p_errno, /* int *p_errnop */
-  0,                          /* int p_errno */
-  NULL,                       /* int *p_h_errnop */
-  0,                          /* int p_h_errno */
   NULL,                       /* char * p_in_sighandler */
   0,                          /* char p_sigwaiting */
   PTHREAD_START_ARGS_INITIALIZER(__pthread_manager),
                               /* struct pthread_start_args p_start_args */
   {NULL},                     /* void ** p_specific[PTHREAD_KEY_1STLEVEL_SIZE] */
   {NULL},                     /* void * p_libc_specific[_LIBC_TSD_KEY_N] */
+  &__pthread_manager_thread.p_errno, /* int *p_errnop */
+  0,                          /* int p_errno */
+  NULL,                       /* int *p_h_errnop */
+  0,                          /* int p_h_errno */
+  NULL,			      /* struct __res_state *p_resp */
+  {},			      /* struct __res_state p_res */
   0,                          /* int p_userstack */
   NULL,                       /* void * p_guardaddr */
   0,                          /* size_t p_guardsize */
@@ -423,8 +428,10 @@ __pthread_initialize_minimal(void)
   self->p_nextlive = self->p_prevlive = self;
   self->p_tid = PTHREAD_THREADS_MAX;
   self->p_lock = &__pthread_handles[0].h_lock;
+# ifndef HAVE___THREAD
   self->p_errnop = &_errno;
   self->p_h_errnop = &_h_errno;
+# endif
   /* self->p_start_args need not be initialized, it's all zero.  */
   self->p_userstack = 1;
 # if __LT_SPINLOCK_INIT != 0
@@ -521,8 +528,10 @@ static void pthread_initialize(void)
 #ifdef USE_TLS
   /* Update the descriptor for the initial thread. */
   THREAD_SETMEM (((pthread_descr) NULL), p_pid, __getpid());
+# ifndef HAVE___THREAD
   /* Likewise for the resolver state _res.  */
   THREAD_SETMEM (((pthread_descr) NULL), p_resp, &_res);
+# endif
 #else
   /* Update the descriptor for the initial thread. */
   __pthread_initial_thread.p_pid = __getpid();
@@ -615,7 +624,9 @@ int __pthread_initialize_manager(void)
   /* Initialize the descriptor.  */
   tcb->p_header.data.self = tcb;
   tcb->p_lock = &__pthread_handles[1].h_lock;
+# ifndef HAVE___THREAD
   tcb->p_errnop = &tcb->p_errno;
+# endif
   tcb->p_start_args = (struct pthread_start_args) PTHREAD_START_ARGS_INITIALIZER(__pthread_manager);
   tcb->p_nr = 1;
 # if __LT_SPINLOCK_INIT != 0
@@ -1048,10 +1059,12 @@ void __pthread_reset_main_thread(void)
   __pthread_main_thread = self;
   THREAD_SETMEM(self, p_nextlive, self);
   THREAD_SETMEM(self, p_prevlive, self);
+#if !(USE_TLS && HAVE___THREAD)
   /* Now this thread modifies the global variables.  */
   THREAD_SETMEM(self, p_errnop, &_errno);
   THREAD_SETMEM(self, p_h_errnop, &_h_errno);
   THREAD_SETMEM(self, p_resp, &_res);
+#endif
 
   if (getrlimit (RLIMIT_STACK, &limit) == 0
       && limit.rlim_cur != limit.rlim_max) {
diff --git a/linuxthreads/specific.c b/linuxthreads/specific.c
index 2dbf2055e5..caa67360ec 100644
--- a/linuxthreads/specific.c
+++ b/linuxthreads/specific.c
@@ -204,6 +204,8 @@ void __pthread_destroy_specifics()
   __pthread_unlock(THREAD_GETMEM(self, p_lock));
 }
 
+#if !(USE_TLS && HAVE___THREAD)
+
 /* Thread-specific data for libc. */
 
 static int
@@ -226,3 +228,5 @@ libc_internal_tsd_get(enum __libc_tsd_key_t key)
 }
 void * (*__libc_internal_tsd_get)(enum __libc_tsd_key_t key)
      = libc_internal_tsd_get;
+
+#endif
diff --git a/linuxthreads/sysdeps/pthread/bits/libc-tsd.h b/linuxthreads/sysdeps/pthread/bits/libc-tsd.h
index 7a532ea74c..79808a5b4d 100644
--- a/linuxthreads/sysdeps/pthread/bits/libc-tsd.h
+++ b/linuxthreads/sysdeps/pthread/bits/libc-tsd.h
@@ -1,5 +1,5 @@
 /* libc-internal interface for thread-specific data.  LinuxThreads version.
-   Copyright (C) 1997, 1998, 1999, 2001 Free Software Foundation, Inc.
+   Copyright (C) 1997,98,99,2001,02 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -20,13 +20,21 @@
 #ifndef _BITS_LIBC_TSD_H
 #define _BITS_LIBC_TSD_H 1
 
-
 /* Fast thread-specific data internal to libc.  */
 enum __libc_tsd_key_t { _LIBC_TSD_KEY_MALLOC = 0,
 			_LIBC_TSD_KEY_DL_ERROR,
 			_LIBC_TSD_KEY_RPC_VARS,
 			_LIBC_TSD_KEY_N };
 
+#include <tls.h>
+
+#if USE_TLS && HAVE___THREAD
+
+/* When __thread works, the generic definition is what we want.  */
+# include <sysdeps/generic/bits/libc-tsd.h>
+
+#else
+
 extern void *(*__libc_internal_tsd_get) (enum __libc_tsd_key_t) __THROW;
 extern int (*__libc_internal_tsd_set) (enum __libc_tsd_key_t,
 				       __const void *)  __THROW;
@@ -41,4 +49,6 @@ extern int (*__libc_internal_tsd_set) (enum __libc_tsd_key_t,
    ? __libc_internal_tsd_set (_LIBC_TSD_KEY_##KEY, (VALUE)) \
    : ((__libc_tsd_##KEY##_data = (VALUE)), 0))
 
+#endif
+
 #endif	/* bits/libc-tsd.h */
diff --git a/linuxthreads/sysdeps/sh/tls.h b/linuxthreads/sysdeps/sh/tls.h
index e8cf504387..7dc40409a6 100644
--- a/linuxthreads/sysdeps/sh/tls.h
+++ b/linuxthreads/sysdeps/sh/tls.h
@@ -73,16 +73,16 @@ typedef struct
 /* Install the dtv pointer.  The pointer passed is to the element with
    index -1 which contain the length.  */
 # define INSTALL_DTV(descr, dtvp) \
-  ((tcbhead_t *) descr)->dtv = dtvp + 1
+  ((tcbhead_t *) (descr))->dtv = dtvp + 1
 
 /* Install new dtv for current thread.  */
 # define INSTALL_NEW_DTV(dtv) \
   ({ struct _pthread_descr_struct *__descr;				      \
-     THREAD_SETMEM (__descr, p_header.data.dtvp, dtv); })
+     THREAD_SETMEM (__descr, p_header.data.dtvp, (dtv)); })
 
 /* Return dtv of given thread descriptor.  */
 # define GET_DTV(descr) \
-  (((tcbhead_t *) descr)->dtv)
+  (((tcbhead_t *) (descr))->dtv)
 
 /* Code to initially initialize the thread pointer.  This might need
    special attention since 'errno' is not yet available and if the
@@ -94,7 +94,7 @@ typedef struct
     tcbhead_t *head = _descr;						      \
 									      \
     head->tcb = _descr;							      \
-    /* For now the thread descriptor is at the same address.  */		      \
+    /* For now the thread descriptor is at the same address.  */	      \
     head->self = _descr;						      \
 									      \
     asm ("ldc %0,gbr" : : "r" (_descr));				      \
diff --git a/linuxthreads/weaks.c b/linuxthreads/weaks.c
index 036e004612..3bbf546378 100644
--- a/linuxthreads/weaks.c
+++ b/linuxthreads/weaks.c
@@ -1,5 +1,5 @@
 /* The weak pthread functions for Linux.
-   Copyright (C) 1996,1997,1998,1999,2000,2001 Free Software Foundation, Inc.
+   Copyright (C) 1996,97,98,99,2000,01,02 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -17,7 +17,6 @@
    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.  */
 
-#include <errno.h>
 #include <limits.h>
 #include <stdlib.h>
 #include <shlib-compat.h>
diff --git a/malloc/malloc.c b/malloc/malloc.c
index cd40626504..0440be5c22 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -516,6 +516,9 @@ Void_t *(*__morecore)(ptrdiff_t) = __default_morecore;
 
 #if (__STD_C || defined(HAVE_MEMCPY))
 
+#ifdef _LIBC
+# include <string.h>
+#else
 #ifdef WIN32
 /* On Win32 memset and memcpy are already declared in windows.h */
 #else
@@ -528,6 +531,7 @@ Void_t* memcpy();
 #endif
 #endif
 #endif
+#endif
 
 /*
   MALLOC_FAILURE_ACTION is the action to take before "return 0" when
diff --git a/misc/sys/select.h b/misc/sys/select.h
index c065113a8b..dc58ec6c2d 100644
--- a/misc/sys/select.h
+++ b/misc/sys/select.h
@@ -1,5 +1,5 @@
 /* `fd_set' type and related macros, and `select'/`pselect' declarations.
-   Copyright (C) 1996,1997,1998,1999,2000,2001 Free Software Foundation, Inc.
+   Copyright (C) 1996,97,98,99,2000,01,02 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -54,6 +54,10 @@ typedef __suseconds_t suseconds_t;
 /* The fd_set member is required to be an array of longs.  */
 typedef long int __fd_mask;
 
+/* Some versions of <linux/posix_types.h> define these macros.  */
+#undef	__NFDBITS
+#undef	__FDELT
+#undef	__FDMASK
 /* It's easier to assume 8-bit bytes than to get CHAR_BIT.  */
 #define __NFDBITS	(8 * sizeof (__fd_mask))
 #define	__FDELT(d)	((d) / __NFDBITS)
diff --git a/resolv/netdb.h b/resolv/netdb.h
index c3e07728c6..d041163ac6 100644
--- a/resolv/netdb.h
+++ b/resolv/netdb.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1996,1997,1998,1999,2000,2001 Free Software Foundation, Inc.
+/* Copyright (C) 1996,97,98,99,2000,01,02 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -59,23 +59,8 @@ extern int h_errno;
 /* Function to get address of global `h_errno' variable.  */
 extern int *__h_errno_location (void) __THROW __attribute__ ((__const__));
 
-#ifdef _LIBC
-# ifdef _LIBC_REENTRANT
-static inline int
-__set_h_errno (int __err)
-{
-  return *__h_errno_location () = __err;
-}
-# else
-#  define __set_h_errno(x) (h_errno = (x))
-# endif	/* _LIBC_REENTRANT */
-#endif /* _LIBC */
-
-
-#if !defined _LIBC || defined _LIBC_REENTRANT
 /* Use a macro to access always the thread specific `h_errno' variable.  */
-# define h_errno (*__h_errno_location ())
-#endif
+#define h_errno (*__h_errno_location ())
 
 
 /* Possible values left in `h_errno'.  */
diff --git a/resolv/res_data.c b/resolv/res_data.c
index 6aa697aecd..7488ba7772 100644
--- a/resolv/res_data.c
+++ b/resolv/res_data.c
@@ -39,8 +39,6 @@ static const char rcsid[] = "$BINDId: res_data.c,v 8.17 1999/10/13 17:11:31 vixi
 #include <string.h>
 #include <unistd.h>
 
-#undef _res
-
 const char *_res_opcodes[] = {
 	"QUERY",
 	"IQUERY",
@@ -71,9 +69,9 @@ const char *_res_sectioncodes[] = {
 
 #ifndef __BIND_NOSTATIC
 #ifdef _LIBC
-extern struct __res_state _res;
-#else
 /* The definition has been moved to res_libc.c.  */
+#else
+#undef _res
 struct __res_state _res
 # if defined(__BIND_RES_TEXT)
 	= { RES_TIMEOUT, }	/* Motorola, et al. */
diff --git a/resolv/res_libc.c b/resolv/res_libc.c
index c7561c9dc2..9f9af1d701 100644
--- a/resolv/res_libc.c
+++ b/resolv/res_libc.c
@@ -22,8 +22,15 @@
 
 #undef _res
 
+#include <tls.h>
+
+#if USE_TLS && HAVE___THREAD
+/* With __thread support, this per-thread variable is used in all cases.  */
+__thread struct __res_state _res;
+#else
 /* The resolver state for use by single-threaded programs.  */
 struct __res_state _res;
+#endif
 
 /* This function is used to access the resolver state in
    single-threaded programs.  */
diff --git a/resolv/resolv.h b/resolv/resolv.h
index 09bddb8965..0804d243db 100644
--- a/resolv/resolv.h
+++ b/resolv/resolv.h
@@ -224,16 +224,10 @@ struct res_sym {
 /*			0x00008000	*/
 
 /* Things involving an internal (static) resolver context. */
-#if !defined _LIBC || defined _LIBC_REENTRANT
 __BEGIN_DECLS
 extern struct __res_state *__res_state(void) __attribute__ ((__const__));
 __END_DECLS
 #define _res (*__res_state())
-#else
-#ifndef __BIND_NOSTATIC
-extern struct __res_state _res;
-#endif
-#endif
 
 #ifndef __BIND_NOSTATIC
 #define fp_nquery		__fp_nquery
diff --git a/sunrpc/rpc_thread.c b/sunrpc/rpc_thread.c
index 7f2e351749..5c25963a11 100644
--- a/sunrpc/rpc_thread.c
+++ b/sunrpc/rpc_thread.c
@@ -8,11 +8,9 @@
 
 #ifdef _RPC_THREAD_SAFE_
 
-
 /* Variable used in non-threaded applications or for the first thread.  */
 static struct rpc_thread_variables __libc_tsd_RPC_VARS_mem;
-static struct rpc_thread_variables *__libc_tsd_RPC_VARS_data =
-     &__libc_tsd_RPC_VARS_mem;
+__libc_tsd_define (static, RPC_VARS)
 
 /*
  * Task-variable destructor
@@ -20,7 +18,7 @@ static struct rpc_thread_variables *__libc_tsd_RPC_VARS_data =
 void
 __rpc_thread_destroy (void)
 {
-	struct rpc_thread_variables *tvp = __rpc_thread_variables();
+	struct rpc_thread_variables *tvp = __libc_tsd_get (RPC_VARS);
 
 	if (tvp != NULL && tvp != &__libc_tsd_RPC_VARS_mem) {
 		__rpc_thread_svc_cleanup ();
@@ -61,7 +59,7 @@ __rpc_thread_variables (void)
 			if (tvp != NULL)
 				__libc_tsd_set (RPC_VARS, tvp);
 			else
-				tvp = __libc_tsd_RPC_VARS_data;
+				tvp = __libc_tsd_get (RPC_VARS);
 		}
 	}
 	return tvp;
diff --git a/sysdeps/generic/bits/libc-tsd.h b/sysdeps/generic/bits/libc-tsd.h
index 80bd1d33dc..fc17be108e 100644
--- a/sysdeps/generic/bits/libc-tsd.h
+++ b/sysdeps/generic/bits/libc-tsd.h
@@ -1,5 +1,5 @@
-/* libc-internal interface for thread-specific data.  Stub version.
-   Copyright (C) 1998, 2001 Free Software Foundation, Inc.
+/* libc-internal interface for thread-specific data.  Stub or TLS version.
+   Copyright (C) 1998,2001,02 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -17,8 +17,8 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-#ifndef _BITS_LIBC_TSD_H
-#define _BITS_LIBC_TSD_H 1
+#ifndef _GENERIC_BITS_LIBC_TSD_H
+#define _GENERIC_BITS_LIBC_TSD_H 1
 
 /* This file defines the following macros for accessing a small fixed
    set of thread-specific `void *' data used only internally by libc.
@@ -40,13 +40,22 @@
    Some implementations may not provide any enum at all and instead
    using string pasting in the macros.  */
 
-/* This is the generic/stub implementation for wholly single-threaded
-   systems.  We don't define an enum for the possible key values, because
-   the KEYs translate directly into variables by macro magic.  */
+#include <tls.h>
 
-#define __libc_tsd_define(CLASS, KEY)	CLASS void *__libc_tsd_##KEY##_data;
-#define __libc_tsd_get(KEY)		(__libc_tsd_##KEY##_data)
-#define __libc_tsd_set(KEY, VALUE)	(__libc_tsd_##KEY##_data = (VALUE))
+/* When full support for __thread variables is available, this interface is
+   just a trivial wrapper for it.  Without TLS, this is the generic/stub
+   implementation for wholly single-threaded systems.
 
+   We don't define an enum for the possible key values, because the KEYs
+   translate directly into variables by macro magic.  */
+
+#if USE_TLS && HAVE___THREAD
+# define __libc_tsd_define(CLASS, KEY)	CLASS __thread void *__libc_tsd_##KEY;
+#else
+# define __libc_tsd_define(CLASS, KEY)	CLASS void *__libc_tsd_##KEY;
+#endif
+
+#define __libc_tsd_get(KEY)		(__libc_tsd_##KEY)
+#define __libc_tsd_set(KEY, VALUE)	(__libc_tsd_##KEY = (VALUE))
 
 #endif	/* bits/libc-tsd.h */
diff --git a/sysdeps/generic/sysdep.h b/sysdeps/generic/sysdep.h
index 3e46461921..280e0e4841 100644
--- a/sysdeps/generic/sysdep.h
+++ b/sysdeps/generic/sysdep.h
@@ -1,5 +1,5 @@
 /* Generic asm macros used on many machines.
-   Copyright (C) 1991, 92, 93, 96, 98 Free Software Foundation, Inc.
+   Copyright (C) 1991,92,93,96,98,2002 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -36,8 +36,10 @@
 
 #endif
 
+#ifdef __ASSEMBLER__
 /* Mark the end of function named SYM.  This is used on some platforms
    to generate correct debugging information.  */
 #ifndef END
 #define END(sym)
 #endif
+#endif /* __ASSEMBLER__ */
diff --git a/sysdeps/unix/sysv/linux/i386/sysdep.h b/sysdeps/unix/sysv/linux/i386/sysdep.h
index a6f18ec6f1..de60df445a 100644
--- a/sysdeps/unix/sysv/linux/i386/sysdep.h
+++ b/sysdeps/unix/sysv/linux/i386/sysdep.h
@@ -33,12 +33,12 @@
 #undef SYS_ify
 #define SYS_ify(syscall_name)	__NR_##syscall_name
 
+#ifdef __ASSEMBLER__
+
 /* ELF-like local names start with `.L'.  */
 #undef L
 #define L(name)	.L##name
 
-#ifdef __ASSEMBLER__
-
 /* Linux uses a negative return value to indicate syscall errors,
    unlike most Unices, which use the condition codes' carry flag.