Update.

1998-08-26 15:46  Ulrich Drepper  <drepper@cygnus.com>

	* internals.h: Define THREAD_GETMEM and THREAD_SETMEM to default if
	not already defined.
	(struct _pthread_descr_struct): Add p_self and p_nr field.
	* manager.c (__pthread_handles): Define second element to point
	to manager thread.
	(__pthread_handles_num): Initialize to 2.
	(__pthread_manager): Use INIT_THREAD_SELF with two arguments.
	(pthread_start_thread): Likewise.
	(pthread_handle_create): Start search for free slot at entry 2.
	Initialize new fields p_self and p_nr.
	Call __clone with CLONE_PTRACE if available.
	(pthread_free): Call FREE_THREAD_SELF if available.
	* pthread.c (__pthread_initial_thread): Initialize new fields.
	(__pthread_manager_thread): Likewise.
	(__pthread_initialize_manager): Call __clone with CLONE_PTRACE.

	* cancel.c: Use THREAD_GETMEM and THREAD_SETMEM to access the
	elements of the thread descriptor.
	* condvar.c: Likewise.
	* errno.c: Likewise.
	* join.c: Likewise.
	* manager.c: Likewise.
	* pthread.c: Likewise.
	* ptlongjmp.c: Likewise.
	* semaphore.c: Likewise.
	* signals.c: Likewise.
	* specific.c: Likewise.
	* spinlock.c: Likewise.

	* sysdeps/alpha/pt-machine.h (INIT_THREAD_SELF): Add extra parameter.

	* sysdeps/i386/useldt.h: New file.
	* sysdeps/i386/i686/pt-machine.h: Show how to use this file.

	* sysdeps/sparc/sparc32/pt-machine.h: Define THREAD_GETMEM and
	THREAD_SETMEM using __thread_self.
	* sysdeps/sparc/sparc64/pt-machine.h: Likewise.

18 files changed, 368 insertions, 112 deletions

diff --git a/linuxthreads/ChangeLog b/linuxthreads/ChangeLog
index 5b4dcbd64a..00f52d6413 100644
--- a/linuxthreads/ChangeLog
+++ b/linuxthreads/ChangeLog
@@ -1,3 +1,43 @@
+1998-08-26 15:46  Ulrich Drepper  <drepper@cygnus.com>
+
+	* internals.h: Define THREAD_GETMEM and THREAD_SETMEM to default if
+	not already defined.
+	(struct _pthread_descr_struct): Add p_self and p_nr field.
+	* manager.c (__pthread_handles): Define second element to point
+	to manager thread.
+	(__pthread_handles_num): Initialize to 2.
+	(__pthread_manager): Use INIT_THREAD_SELF with two arguments.
+	(pthread_start_thread): Likewise.
+	(pthread_handle_create): Start search for free slot at entry 2.
+	Initialize new fields p_self and p_nr.
+	Call __clone with CLONE_PTRACE if available.
+	(pthread_free): Call FREE_THREAD_SELF if available.
+	* pthread.c (__pthread_initial_thread): Initialize new fields.
+	(__pthread_manager_thread): Likewise.
+	(__pthread_initialize_manager): Call __clone with CLONE_PTRACE.
+
+	* cancel.c: Use THREAD_GETMEM and THREAD_SETMEM to access the
+	elements of the thread descriptor.
+	* condvar.c: Likewise.
+	* errno.c: Likewise.
+	* join.c: Likewise.
+	* manager.c: Likewise.
+	* pthread.c: Likewise.
+	* ptlongjmp.c: Likewise.
+	* semaphore.c: Likewise.
+	* signals.c: Likewise.
+	* specific.c: Likewise.
+	* spinlock.c: Likewise.
+
+	* sysdeps/alpha/pt-machine.h (INIT_THREAD_SELF): Add extra parameter.
+
+	* sysdeps/i386/useldt.h: New file.
+	* sysdeps/i386/i686/pt-machine.h: Show how to use this file.
+
+	* sysdeps/sparc/sparc32/pt-machine.h: Define THREAD_GETMEM and
+	THREAD_SETMEM using __thread_self.
+	* sysdeps/sparc/sparc64/pt-machine.h: Likewise.
+
 1998-08-24  Geoff Keating  <geoffk@ozemail.com.au>
 
 	* spinlock.c (__pthread_lock): Reset p_nextwaiting to NULL if it
diff --git a/linuxthreads/cancel.c b/linuxthreads/cancel.c
index eda5d88154..e9cb10cc7c 100644
--- a/linuxthreads/cancel.c
+++ b/linuxthreads/cancel.c
@@ -25,11 +25,11 @@ int pthread_setcancelstate(int state, int * oldstate)
   pthread_descr self = thread_self();
   if (state < PTHREAD_CANCEL_ENABLE || state > PTHREAD_CANCEL_DISABLE)
     return EINVAL;
-  if (oldstate != NULL) *oldstate = self->p_cancelstate;
-  self->p_cancelstate = state;
-  if (self->p_canceled &&
-      self->p_cancelstate == PTHREAD_CANCEL_ENABLE &&
-      self->p_canceltype == PTHREAD_CANCEL_ASYNCHRONOUS)
+  if (oldstate != NULL) *oldstate = THREAD_GETMEM(self, p_cancelstate);
+  THREAD_SETMEM(self, p_cancelstate, state);
+  if (THREAD_GETMEM(self, p_canceled) &&
+      THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE &&
+      THREAD_GETMEM(self, p_canceltype) == PTHREAD_CANCEL_ASYNCHRONOUS)
     pthread_exit(PTHREAD_CANCELED);
   return 0;
 }
@@ -39,11 +39,11 @@ int pthread_setcanceltype(int type, int * oldtype)
   pthread_descr self = thread_self();
   if (type < PTHREAD_CANCEL_DEFERRED || type > PTHREAD_CANCEL_ASYNCHRONOUS)
     return EINVAL;
-  if (oldtype != NULL) *oldtype = self->p_canceltype;
-  self->p_canceltype = type;
-  if (self->p_canceled &&
-      self->p_cancelstate == PTHREAD_CANCEL_ENABLE &&
-      self->p_canceltype == PTHREAD_CANCEL_ASYNCHRONOUS)
+  if (oldtype != NULL) *oldtype = THREAD_GETMEM(self, p_canceltype);
+  THREAD_SETMEM(self, p_canceltype, type);
+  if (THREAD_GETMEM(self, p_canceled) &&
+      THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE &&
+      THREAD_GETMEM(self, p_canceltype) == PTHREAD_CANCEL_ASYNCHRONOUS)
     pthread_exit(PTHREAD_CANCELED);
   return 0;
 }
@@ -68,7 +68,8 @@ int pthread_cancel(pthread_t thread)
 void pthread_testcancel(void)
 {
   pthread_descr self = thread_self();
-  if (self->p_canceled && self->p_cancelstate == PTHREAD_CANCEL_ENABLE)
+  if (THREAD_GETMEM(self, p_canceled)
+      && THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE)
     pthread_exit(PTHREAD_CANCELED);
 }
 
@@ -78,8 +79,8 @@ void _pthread_cleanup_push(struct _pthread_cleanup_buffer * buffer,
   pthread_descr self = thread_self();
   buffer->routine = routine;
   buffer->arg = arg;
-  buffer->prev = self->p_cleanup;
-  self->p_cleanup = buffer;
+  buffer->prev = THREAD_GETMEM(self, p_cleanup);
+  THREAD_SETMEM(self, p_cleanup, buffer);
 }
 
 void _pthread_cleanup_pop(struct _pthread_cleanup_buffer * buffer,
@@ -87,7 +88,7 @@ void _pthread_cleanup_pop(struct _pthread_cleanup_buffer * buffer,
 {
   pthread_descr self = thread_self();
   if (execute) buffer->routine(buffer->arg);
-  self->p_cleanup = buffer->prev;
+  THREAD_SETMEM(self, p_cleanup, buffer->prev);
 }
 
 void _pthread_cleanup_push_defer(struct _pthread_cleanup_buffer * buffer,
@@ -96,10 +97,10 @@ void _pthread_cleanup_push_defer(struct _pthread_cleanup_buffer * buffer,
   pthread_descr self = thread_self();
   buffer->routine = routine;
   buffer->arg = arg;
-  buffer->canceltype = self->p_canceltype;
-  buffer->prev = self->p_cleanup;
-  self->p_canceltype = PTHREAD_CANCEL_DEFERRED;
-  self->p_cleanup = buffer;
+  buffer->canceltype = THREAD_GETMEM(self, p_canceltype);
+  buffer->prev = THREAD_GETMEM(self, p_cleanup);
+  THREAD_SETMEM(self, p_canceltype, PTHREAD_CANCEL_DEFERRED);
+  THREAD_SETMEM(self, p_cleanup, buffer);
 }
 
 void _pthread_cleanup_pop_restore(struct _pthread_cleanup_buffer * buffer,
@@ -107,11 +108,11 @@ void _pthread_cleanup_pop_restore(struct _pthread_cleanup_buffer * buffer,
 {
   pthread_descr self = thread_self();
   if (execute) buffer->routine(buffer->arg);
-  self->p_cleanup = buffer->prev;
-  self->p_canceltype = buffer->canceltype;
-  if (self->p_canceled &&
-      self->p_cancelstate == PTHREAD_CANCEL_ENABLE &&
-      self->p_canceltype == PTHREAD_CANCEL_ASYNCHRONOUS)
+  THREAD_SETMEM(self, p_cleanup, buffer->prev);
+  THREAD_SETMEM(self, p_canceltype, buffer->canceltype);
+  if (THREAD_GETMEM(self, p_canceled) &&
+      THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE &&
+      THREAD_GETMEM(self, p_canceltype) == PTHREAD_CANCEL_ASYNCHRONOUS)
     pthread_exit(PTHREAD_CANCELED);
 }
 
@@ -119,7 +120,8 @@ void __pthread_perform_cleanup(void)
 {
   pthread_descr self = thread_self();
   struct _pthread_cleanup_buffer * c;
-  for (c = self->p_cleanup; c != NULL; c = c->prev) c->routine(c->arg);
+  for (c = THREAD_GETMEM(self, p_cleanup); c != NULL; c = c->prev)
+    c->routine(c->arg);
 }
 
 #ifndef PIC
diff --git a/linuxthreads/condvar.c b/linuxthreads/condvar.c
index 480a8e426e..773d7144f0 100644
--- a/linuxthreads/condvar.c
+++ b/linuxthreads/condvar.c
@@ -50,7 +50,8 @@ int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
   suspend_with_cancellation(self);
   pthread_mutex_lock(mutex);
   /* This is a cancellation point */
-  if (self->p_canceled && self->p_cancelstate == PTHREAD_CANCEL_ENABLE) {
+  if (THREAD_GETMEM(self, p_canceled)
+      && THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE) {
     /* Remove ourselves from the waiting queue if we're still on it */
     __pthread_lock(&cond->c_lock);
     remove_from_queue(&cond->c_waiting, self);
@@ -77,11 +78,12 @@ pthread_cond_timedwait_relative(pthread_cond_t *cond,
   pthread_mutex_unlock(mutex);
   /* Set up a longjmp handler for the restart and cancel signals */
   if (sigsetjmp(jmpbuf, 1) == 0) {
-    self->p_signal_jmp = &jmpbuf;
-    self->p_cancel_jmp = &jmpbuf;
-    self->p_signal = 0;
+    THREAD_SETMEM(self, p_signal_jmp, &jmpbuf);
+    THREAD_SETMEM(self, p_cancel_jmp, &jmpbuf);
+    THREAD_SETMEM(self, p_signal, 0);
     /* Check for cancellation */
-    if (self->p_canceled && self->p_cancelstate == PTHREAD_CANCEL_ENABLE) {
+    if (THREAD_GETMEM(self, p_canceled)
+	&& THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE) {
       retsleep = -1;
     } else {
       /* Unblock the restart signal */
@@ -96,14 +98,15 @@ pthread_cond_timedwait_relative(pthread_cond_t *cond,
   } else {
     retsleep = -1;
   }
-  self->p_signal_jmp = NULL;
-  self->p_cancel_jmp = NULL;
+  THREAD_SETMEM(self, p_signal_jmp, NULL);
+  THREAD_SETMEM(self, p_cancel_jmp, NULL);
   /* Here, either the condition was signaled (self->p_signal != 0)
                    or we got canceled (self->p_canceled != 0)
                    or the timeout occurred (retsleep == 0)
                    or another interrupt occurred (retsleep == -1) */
   /* This is a cancellation point */
-  if (self->p_canceled && self->p_cancelstate == PTHREAD_CANCEL_ENABLE) {
+  if (THREAD_GETMEM(self, p_canceled)
+      && THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE) {
     __pthread_lock(&cond->c_lock);
     remove_from_queue(&cond->c_waiting, self);
     __pthread_unlock(&cond->c_lock);
@@ -111,7 +114,7 @@ pthread_cond_timedwait_relative(pthread_cond_t *cond,
     pthread_exit(PTHREAD_CANCELED);
   }
   /* If not signaled: also remove ourselves and return an error code */
-  if (self->p_signal == 0) {
+  if (THREAD_GETMEM(self, p_signal) == 0) {
     __pthread_lock(&cond->c_lock);
     remove_from_queue(&cond->c_waiting, self);
     __pthread_unlock(&cond->c_lock);
diff --git a/linuxthreads/errno.c b/linuxthreads/errno.c
index 3619aa87b6..746474860c 100644
--- a/linuxthreads/errno.c
+++ b/linuxthreads/errno.c
@@ -22,11 +22,11 @@
 int * __errno_location()
 {
   pthread_descr self = thread_self();
-  return self->p_errnop;
+  return THREAD_GETMEM (self, p_errnop);
 }
 
 int * __h_errno_location()
 {
   pthread_descr self = thread_self();
-  return self->p_h_errnop;
+  return THREAD_GETMEM (self, p_h_errnop);
 }
diff --git a/linuxthreads/internals.h b/linuxthreads/internals.h
index 62c14c606d..d418fe2211 100644
--- a/linuxthreads/internals.h
+++ b/linuxthreads/internals.h
@@ -25,6 +25,13 @@
 
 #include "pt-machine.h"
 
+#ifndef THREAD_GETMEM
+# define THREAD_GETMEM(descr, member) descr->member
+#endif
+#ifndef THREAD_SETMEM
+# define THREAD_SETMEM(descr, member, value) descr->member = (value)
+#endif
+
 /* Arguments passed to thread creation routine */
 
 struct pthread_start_args {
@@ -90,6 +97,8 @@ struct _pthread_descr_struct {
   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 */
+  pthread_descr p_self;		/* Pointer to this structure */
+  int p_nr;                     /* Index of descriptor in __pthread_handles */
 };
 
 /* The type of thread handles. */
diff --git a/linuxthreads/join.c b/linuxthreads/join.c
index 4fadd85299..482f0d1dcc 100644
--- a/linuxthreads/join.c
+++ b/linuxthreads/join.c
@@ -30,18 +30,18 @@ void pthread_exit(void * retval)
 
   /* Reset the cancellation flag to avoid looping if the cleanup handlers
      contain cancellation points */
-  self->p_canceled = 0;
+  THREAD_SETMEM(self, p_canceled, 0);
   /* Call cleanup functions and destroy the thread-specific data */
   __pthread_perform_cleanup();
   __pthread_destroy_specifics();
   /* Store return value */
-  __pthread_lock(self->p_lock);
-  self->p_retval = retval;
+  __pthread_lock(THREAD_GETMEM(self, p_lock));
+  THREAD_SETMEM(self, p_retval, retval);
   /* Say that we've terminated */
-  self->p_terminated = 1;
+  THREAD_SETMEM(self, p_terminated, 1);
   /* See if someone is joining on us */
-  joining = self->p_joining;
-  __pthread_unlock(self->p_lock);
+  joining = THREAD_GETMEM(self, p_joining);
+  __pthread_unlock(THREAD_GETMEM(self, p_lock));
   /* Restart joining thread if any */
   if (joining != NULL) restart(joining);
   /* If this is the initial thread, block until all threads have terminated.
@@ -86,7 +86,8 @@ int pthread_join(pthread_t thread_id, void ** thread_return)
     __pthread_unlock(&handle->h_lock);
     suspend_with_cancellation(self);
     /* This is a cancellation point */
-    if (self->p_canceled && self->p_cancelstate == PTHREAD_CANCEL_ENABLE) {
+    if (THREAD_GETMEM(self, p_canceled)
+	&& THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE) {
       th->p_joining = NULL;
       pthread_exit(PTHREAD_CANCELED);
     }
diff --git a/linuxthreads/manager.c b/linuxthreads/manager.c
index 41acf01b29..d145395407 100644
--- a/linuxthreads/manager.c
+++ b/linuxthreads/manager.c
@@ -36,14 +36,15 @@
 
 /* Array of active threads. Entry 0 is reserved for the initial thread. */
 struct pthread_handle_struct __pthread_handles[PTHREAD_THREADS_MAX] =
-{ { LOCK_INITIALIZER, &__pthread_initial_thread, 0}, /* All NULLs */ };
+{ { LOCK_INITIALIZER, &__pthread_initial_thread, 0},
+  { LOCK_INITIALIZER, &__pthread_manager_thread, 0}, /* All NULLs */ };
 
 /* Indicate whether at least one thread has a user-defined stack (if 1),
    or if all threads have stacks supplied by LinuxThreads (if 0). */
 int __pthread_nonstandard_stacks = 0;
 
 /* Number of active entries in __pthread_handles (used by gdb) */
-volatile int __pthread_handles_num = 1;
+volatile int __pthread_handles_num = 2;
 
 /* Whether to use debugger additional actions for thread creation
    (set to 1 by gdb) */
@@ -95,7 +96,7 @@ int __pthread_manager(void *arg)
 
   /* If we have special thread_self processing, initialize it.  */
 #ifdef INIT_THREAD_SELF
-  INIT_THREAD_SELF(&__pthread_manager_thread);
+  INIT_THREAD_SELF(&__pthread_manager_thread, 1);
 #endif
   /* Set the error variable.  */
   __pthread_manager_thread.p_errnop = &__pthread_manager_thread.p_errno;
@@ -179,17 +180,18 @@ static int pthread_start_thread(void *arg)
   void * outcome;
   /* Initialize special thread_self processing, if any.  */
 #ifdef INIT_THREAD_SELF
-  INIT_THREAD_SELF(self);
+  INIT_THREAD_SELF(self, self->p_nr);
 #endif
   /* Make sure our pid field is initialized, just in case we get there
      before our father has initialized it. */
-  self->p_pid = __getpid();
+  THREAD_SETMEM(self, p_pid, __getpid());
   /* Initial signal mask is that of the creating thread. (Otherwise,
      we'd just inherit the mask of the thread manager.) */
   sigprocmask(SIG_SETMASK, &self->p_start_args.mask, NULL);
   /* Set the scheduling policy and priority for the new thread, if needed */
-  if (self->p_start_args.schedpolicy >= 0)
-    __sched_setscheduler(self->p_pid, self->p_start_args.schedpolicy,
+  if (THREAD_GETMEM(self, p_start_args.schedpolicy) >= 0)
+    __sched_setscheduler(THREAD_GETMEM(self, p_pid),
+			 THREAD_GETMEM(self, p_start_args.schedpolicy),
                          &self->p_start_args.schedparam);
   /* Make gdb aware of new thread */
   if (__pthread_threads_debug) {
@@ -200,7 +202,8 @@ static int pthread_start_thread(void *arg)
     suspend(self);
   }
   /* Run the thread code */
-  outcome = self->p_start_args.start_routine(self->p_start_args.arg);
+  outcome = self->p_start_args.start_routine(THREAD_GETMEM(self,
+							   p_start_args.arg));
   /* Exit with the given return value */
   pthread_exit(outcome);
   return 0;
@@ -298,7 +301,7 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr,
   if (attr != NULL && attr->schedpolicy != SCHED_OTHER && geteuid () != 0)
     return EPERM;
   /* Find a free segment for the thread, and allocate a stack if needed */
-  for (sseg = 1; ; sseg++)
+  for (sseg = 2; ; sseg++)
     {
       if (sseg >= PTHREAD_THREADS_MAX)
 	return EAGAIN;
@@ -340,6 +343,8 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr,
   new_thread->p_userstack = attr != NULL && attr->stackaddr_set;
   memset (new_thread->p_specific, '\0',
 	  PTHREAD_KEY_1STLEVEL_SIZE * sizeof (new_thread->p_specific[0]));
+  new_thread->p_self = new_thread;
+  new_thread->p_nr = sseg;
   /* Initialize the thread handle */
   __pthread_init_lock(&__pthread_handles[sseg].h_lock);
   __pthread_handles[sseg].h_descr = new_thread;
@@ -370,8 +375,10 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr,
   /* Do the cloning */
   pid = __clone(pthread_start_thread, (void **) new_thread,
                 CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND |
-                __pthread_sig_restart,
-                new_thread);
+#ifdef CLONE_PTRACE
+                CLONE_PTRACE |
+#endif
+		__pthread_sig_restart, new_thread);
   /* Check if cloning succeeded */
   if (pid == -1) {
     /* Free the stack if we allocated it */
@@ -414,6 +421,9 @@ static void pthread_free(pthread_descr th)
   handle->h_descr = NULL;
   handle->h_bottom = (char *)(-1L);
   __pthread_unlock(&handle->h_lock);
+#ifdef FREE_THREAD_SELF
+  FREE_THREAD_SELF(th, th->p_nr);
+#endif
   /* One fewer threads in __pthread_handles */
   __pthread_handles_num--;
   /* If initial thread, nothing to free */
diff --git a/linuxthreads/pthread.c b/linuxthreads/pthread.c
index 313220e7a0..c7cfdac796 100644
--- a/linuxthreads/pthread.c
+++ b/linuxthreads/pthread.c
@@ -58,7 +58,13 @@ struct _pthread_descr_struct __pthread_initial_thread = {
   NULL,                       /* char * p_in_sighandler */
   0,                          /* char p_sigwaiting */
   PTHREAD_START_ARGS_INITIALIZER, /* struct pthread_start_args p_start_args */
-  {NULL}                      /* void * p_specific[PTHREAD_KEYS_MAX] */
+  {NULL},                     /* void ** p_specific[PTHREAD_KEY_1STLEVEL_SIZE] */
+  {NULL},                     /* void * p_libc_specific[_LIBC_TSD_KEY_N] */
+  0,                          /* int p_userstack */
+  NULL,                       /* void * p_guardaddr */
+  0,                          /* size_t p_guardsize */
+  &__pthread_initial_thread,  /* pthread_descr p_self */
+  0                           /* Always index 0 */
 };
 
 /* Descriptor of the manager thread; none of this is used but the error
@@ -86,14 +92,20 @@ struct _pthread_descr_struct __pthread_manager_thread = {
   0,                          /* char p_cancelstate */
   0,                          /* char p_canceltype */
   0,                          /* char p_canceled */
-  NULL,                       /* int *p_errnop */
+  &__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, /* struct pthread_start_args p_start_args */
-  {NULL}                      /* void * p_specific[PTHREAD_KEYS_MAX] */
+  {NULL},                     /* void ** p_specific[PTHREAD_KEY_1STLEVEL_SIZE] */
+  {NULL},                     /* void * p_libc_specific[_LIBC_TSD_KEY_N] */
+  0,                          /* int p_userstack */
+  NULL,                       /* void * p_guardaddr */
+  0,                          /* size_t p_guardsize */
+  &__pthread_manager_thread,  /* pthread_descr p_self */
+  1                           /* Always index 1 */
 };
 
 /* Pointer to the main thread (the father of the thread manager thread) */
@@ -145,8 +157,13 @@ extern int _h_errno;
 /* Forward declarations */
 
 static void pthread_exit_process(int retcode, void *arg);
+#ifndef __i386__
 static void pthread_handle_sigcancel(int sig);
 static void pthread_handle_sigrestart(int sig);
+#else
+static void pthread_handle_sigcancel(int sig, struct sigcontext ctx);
+static void pthread_handle_sigrestart(int sig, struct sigcontext ctx);
+#endif
 
 /* Initialize the pthread library.
    Initialization is split in two functions:
@@ -189,7 +206,7 @@ static void pthread_initialize(void)
   /* If we have special thread_self processing, initialize that for the
      main thread now.  */
 #ifdef INIT_THREAD_SELF
-  INIT_THREAD_SELF(&__pthread_initial_thread);
+  INIT_THREAD_SELF(&__pthread_initial_thread, 0);
 #endif
   /* The errno/h_errno variable of the main thread are the global ones.  */
   __pthread_initial_thread.p_errnop = &_errno;
@@ -209,12 +226,20 @@ static void pthread_initialize(void)
   /* Setup signal handlers for the initial thread.
      Since signal handlers are shared between threads, these settings
      will be inherited by all other threads. */
+#ifndef __i386__
   sa.sa_handler = pthread_handle_sigrestart;
+#else
+  sa.sa_handler = (__sighandler_t) pthread_handle_sigrestart;
+#endif
   sigemptyset(&sa.sa_mask);
   sa.sa_flags = SA_RESTART; /* does not matter for regular threads, but
                                better for the thread manager */
   __sigaction(__pthread_sig_restart, &sa, NULL);
+#ifndef __i386__
   sa.sa_handler = pthread_handle_sigcancel;
+#else
+  sa.sa_handler = (__sighandler_t) pthread_handle_sigcancel;
+#endif
   sa.sa_flags = 0;
   __sigaction(__pthread_sig_cancel, &sa, NULL);
 
@@ -254,8 +279,11 @@ int __pthread_initialize_manager(void)
   }
   /* Start the thread manager */
   pid = __clone(__pthread_manager, (void **) __pthread_manager_thread_tos,
-                CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND,
-                (void *)(long)manager_pipe[0]);
+                CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND
+#ifdef CLONE_PTRACE
+		| CLONE_PTRACE
+#endif
+		, (void *)(long)manager_pipe[0]);
   if (pid == -1) {
     free(__pthread_manager_thread_bos);
     __libc_close(manager_pipe[0]);
@@ -292,8 +320,9 @@ int __pthread_create_2_1(pthread_t *thread, const pthread_attr_t *attr,
               &request.req_args.create.mask);
   __libc_write(__pthread_manager_request, (char *) &request, sizeof(request));
   suspend(self);
-  if (self->p_retcode == 0) *thread = (pthread_t) self->p_retval;
-  return self->p_retcode;
+  if (THREAD_GETMEM(self, p_retcode) == 0)
+    *thread = (pthread_t) THREAD_GETMEM(self, p_retval);
+  return THREAD_GETMEM(self, p_retcode);
 }
 
 #if defined HAVE_ELF && defined PIC && defined DO_VERSIONING
@@ -330,7 +359,7 @@ strong_alias (__pthread_create_2_1, pthread_create)
 pthread_t pthread_self(void)
 {
   pthread_descr self = thread_self();
-  return self->p_tid;
+  return THREAD_GETMEM(self, p_tid);
 }
 
 int pthread_equal(pthread_t thread1, pthread_t thread2)
@@ -347,9 +376,9 @@ pthread_descr __pthread_find_self()
   char * sp = CURRENT_STACK_FRAME;
   pthread_handle h;
 
-  /* __pthread_handles[0] is the initial thread, handled specially in
-     thread_self(), so start at 1 */
-  h = __pthread_handles + 1;
+  /* __pthread_handles[0] is the initial thread, __pthread_handles[1] is
+     the manager threads handled specially in thread_self(), so start at 2 */
+  h = __pthread_handles + 2;
   while (! (sp <= (char *) h->h_descr && sp >= h->h_bottom)) h++;
   return h->h_descr;
 }
@@ -428,14 +457,23 @@ static void pthread_exit_process(int retcode, void *arg)
    For the thread manager thread, redirect the signal to
    __pthread_manager_sighandler. */
 
+#ifndef __i386__
 static void pthread_handle_sigrestart(int sig)
 {
   pthread_descr self = thread_self();
+#else
+static void pthread_handle_sigrestart(int sig, struct sigcontext ctx)
+{
+  pthread_descr self;
+  asm volatile ("movw %w0,%%gs" : : "r" (ctx.gs));
+  self = thread_self();
+#endif
   if (self == &__pthread_manager_thread) {
     __pthread_manager_sighandler(sig);
   } else {
-    self->p_signal = sig;
-    if (self->p_signal_jmp != NULL) siglongjmp(*self->p_signal_jmp, 1);
+    THREAD_SETMEM(self, p_signal, sig);
+    if (THREAD_GETMEM(self, p_signal_jmp) != NULL)
+      siglongjmp(*THREAD_GETMEM(self, p_signal_jmp), 1);
   }
 }
 
@@ -451,10 +489,19 @@ static void pthread_handle_sigrestart(int sig)
    know what it is specifically done for. In the current implementation,
    the thread manager simply discards it. */
 
+#ifndef __i386__
 static void pthread_handle_sigcancel(int sig)
 {
   pthread_descr self = thread_self();
   sigjmp_buf * jmpbuf;
+#else
+static void pthread_handle_sigcancel(int sig, struct sigcontext ctx)
+{
+  pthread_descr self;
+  sigjmp_buf * jmpbuf;
+  asm volatile ("movw %w0,%%gs" : : "r" (ctx.gs));
+  self = thread_self();
+#endif
 
   if (self == &__pthread_manager_thread)
     return;
@@ -465,12 +512,13 @@ static void pthread_handle_sigcancel(int sig)
       waitpid(__pthread_manager_thread.p_pid, NULL, __WCLONE);
     _exit(__pthread_exit_code);
   }
-  if (self->p_canceled && self->p_cancelstate == PTHREAD_CANCEL_ENABLE) {
-    if (self->p_canceltype == PTHREAD_CANCEL_ASYNCHRONOUS)
+  if (THREAD_GETMEM(self, p_canceled)
+      && THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE) {
+    if (THREAD_GETMEM(self, p_canceltype) == PTHREAD_CANCEL_ASYNCHRONOUS)
       pthread_exit(PTHREAD_CANCELED);
-    jmpbuf = self->p_cancel_jmp;
+    jmpbuf = THREAD_GETMEM(self, p_cancel_jmp);
     if (jmpbuf != NULL) {
-      self->p_cancel_jmp = NULL;
+      THREAD_SETMEM(self, p_cancel_jmp, NULL);
       siglongjmp(*jmpbuf, 1);
     }
   }
@@ -496,14 +544,14 @@ void __pthread_reset_main_thread()
     __pthread_manager_request = __pthread_manager_reader = -1;
   }
   /* Update the pid of the main thread */
-  self->p_pid = __getpid();
+  THREAD_SETMEM(self, p_pid, __getpid());
   /* Make the forked thread the main thread */
   __pthread_main_thread = self;
-  self->p_nextlive = self;
-  self->p_prevlive = self;
+  THREAD_SETMEM(self, p_nextlive, self);
+  THREAD_SETMEM(self, p_prevlive, self);
   /* Now this thread modifies the global variables.  */
-  self->p_errnop = &_errno;
-  self->p_h_errnop = &_h_errno;
+  THREAD_SETMEM(self, p_errnop, &_errno);
+  THREAD_SETMEM(self, p_h_errnop, &_h_errno);
 }
 
 /* Process-wide exec() request */
diff --git a/linuxthreads/ptlongjmp.c b/linuxthreads/ptlongjmp.c
index 580ae93f88..7e4314ec2d 100644
--- a/linuxthreads/ptlongjmp.c
+++ b/linuxthreads/ptlongjmp.c
@@ -32,13 +32,14 @@ static void pthread_cleanup_upto(__jmp_buf target)
   pthread_descr self = thread_self();
   struct _pthread_cleanup_buffer * c;
 
-  for (c = self->p_cleanup;
+  for (c = THREAD_GETMEM(self, p_cleanup);
        c != NULL && _JMPBUF_UNWINDS(target, c);
        c = c->prev)
     c->routine(c->arg);
-  self->p_cleanup = c;
-  if (self->p_in_sighandler && _JMPBUF_UNWINDS(target, self->p_in_sighandler))
-    self->p_in_sighandler = NULL;
+  THREAD_SETMEM(self, p_cleanup, c);
+  if (THREAD_GETMEM(self, p_in_sighandler)
+      && _JMPBUF_UNWINDS(target, THREAD_GETMEM(self, p_in_sighandler)))
+    THREAD_SETMEM(self, p_in_sighandler, NULL);
 }
 
 void siglongjmp(sigjmp_buf env, int val)
diff --git a/linuxthreads/semaphore.c b/linuxthreads/semaphore.c
index 6f79dc0138..af5f115a16 100644
--- a/linuxthreads/semaphore.c
+++ b/linuxthreads/semaphore.c
@@ -54,7 +54,8 @@ int sem_wait(sem_t * sem)
   __pthread_unlock((struct _pthread_fastlock *) &sem->sem_lock);
   suspend_with_cancellation(self);
   /* This is a cancellation point */
-  if (self->p_canceled && self->p_cancelstate == PTHREAD_CANCEL_ENABLE) {
+  if (THREAD_GETMEM(self, p_canceled)
+      && THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE) {
     /* Remove ourselves from the waiting list if we're still on it */
     __pthread_lock((struct _pthread_fastlock *) &sem->sem_lock);
     remove_from_queue(&sem->sem_waiting, self);
@@ -86,7 +87,7 @@ int sem_post(sem_t * sem)
   pthread_descr th;
   struct pthread_request request;
 
-  if (self->p_in_sighandler == NULL) {
+  if (THREAD_GETMEM(self, p_in_sighandler) == NULL) {
     __pthread_lock((struct _pthread_fastlock *) &sem->sem_lock);
     if (sem->sem_waiting == NULL) {
       if (sem->sem_value >= SEM_VALUE_MAX) {
diff --git a/linuxthreads/signals.c b/linuxthreads/signals.c
index 392b5ea5a9..a6674bfc0d 100644
--- a/linuxthreads/signals.c
+++ b/linuxthreads/signals.c
@@ -76,17 +76,19 @@ static void pthread_sighandler(int signo)
   char * in_sighandler;
   /* If we're in a sigwait operation, just record the signal received
      and return without calling the user's handler */
-  if (self->p_sigwaiting) {
-    self->p_sigwaiting = 0;
-    self->p_signal = signo;
+  if (THREAD_GETMEM(self, p_sigwaiting)) {
+    THREAD_SETMEM(self, p_sigwaiting, 0);
+    THREAD_SETMEM(self, p_signal, signo);
     return;
   }
   /* Record that we're in a signal handler and call the user's
      handler function */
-  in_sighandler = self->p_in_sighandler;
-  if (in_sighandler == NULL) self->p_in_sighandler = CURRENT_STACK_FRAME;
+  in_sighandler = THREAD_GETMEM(self, p_in_sighandler);
+  if (in_sighandler == NULL)
+    THREAD_SETMEM(self, p_in_sighandler, CURRENT_STACK_FRAME);
   sighandler[signo](signo);
-  if (in_sighandler == NULL) self->p_in_sighandler = NULL;
+  if (in_sighandler == NULL)
+    THREAD_SETMEM(self, p_in_sighandler, NULL);
 }
 
 int sigaction(int sig, const struct sigaction * act,
@@ -131,21 +133,22 @@ int sigwait(const sigset_t * set, int * sig)
   }
   /* Test for cancellation */
   if (sigsetjmp(jmpbuf, 1) == 0) {
-    self->p_cancel_jmp = &jmpbuf;
-    if (! (self->p_canceled && self->p_cancelstate == PTHREAD_CANCEL_ENABLE)) {
+    THREAD_SETMEM(self, p_cancel_jmp, &jmpbuf);
+    if (! (THREAD_GETMEM(self, p_canceled)
+	   && THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE)) {
       /* Reset the signal count */
-      self->p_signal = 0;
+      THREAD_SETMEM(self, p_signal, 0);
       /* Say we're in sigwait */
-      self->p_sigwaiting = 1;
+      THREAD_SETMEM(self, p_sigwaiting, 1);
       /* Unblock the signals and wait for them */
       sigsuspend(&mask);
     }
   }
-  self->p_cancel_jmp = NULL;
+  THREAD_SETMEM(self, p_cancel_jmp, NULL);
   /* The signals are now reblocked.  Check for cancellation */
   pthread_testcancel();
   /* We should have self->p_signal != 0 and equal to the signal received */
-  *sig = self->p_signal;
+  *sig = THREAD_GETMEM(self, p_signal);
   return 0;
 }
 
diff --git a/linuxthreads/specific.c b/linuxthreads/specific.c
index 12990f454c..4ebbad7f5f 100644
--- a/linuxthreads/specific.c
+++ b/linuxthreads/specific.c
@@ -99,13 +99,13 @@ int __pthread_setspecific(pthread_key_t key, const void * pointer)
     return EINVAL;
   idx1st = key / PTHREAD_KEY_2NDLEVEL_SIZE;
   idx2nd = key % PTHREAD_KEY_2NDLEVEL_SIZE;
-  if (self->p_specific[idx1st] == NULL) {
-    self->p_specific[idx1st] =
-      calloc(PTHREAD_KEY_2NDLEVEL_SIZE, sizeof (void *));
-    if (self->p_specific[idx1st] == NULL)
+  if (THREAD_GETMEM(self, p_specific[idx1st]) == NULL) {
+    THREAD_SETMEM(self, p_specific[idx1st],
+		  calloc(PTHREAD_KEY_2NDLEVEL_SIZE, sizeof (void *)));
+    if (THREAD_GETMEM(self, p_specific[idx1st]) == NULL)
       return ENOMEM;
   }
-  self->p_specific[idx1st][idx2nd] = (void *) pointer;
+  THREAD_GETMEM(self, p_specific[idx1st])[idx2nd] = (void *) pointer;
   return 0;
 }
 weak_alias (__pthread_setspecific, pthread_setspecific)
@@ -121,9 +121,10 @@ void * __pthread_getspecific(pthread_key_t key)
     return NULL;
   idx1st = key / PTHREAD_KEY_2NDLEVEL_SIZE;
   idx2nd = key % PTHREAD_KEY_2NDLEVEL_SIZE;
-  if (self->p_specific[idx1st] == NULL || !pthread_keys[key].in_use)
+  if (THREAD_GETMEM(self, p_specific[idx1st]) == NULL
+      || !pthread_keys[key].in_use)
     return NULL;
-  return self->p_specific[idx1st][idx2nd];
+  return THREAD_GETMEM(self, p_specific[idx1st])[idx2nd];
 }
 weak_alias (__pthread_getspecific, pthread_getspecific)
 
@@ -141,19 +142,20 @@ void __pthread_destroy_specifics()
        round++) {
     found_nonzero = 0;
     for (i = 0; i < PTHREAD_KEY_1STLEVEL_SIZE; i++)
-      if (self->p_specific[i] != NULL)
+      if (THREAD_GETMEM(self, p_specific[i]) != NULL)
         for (j = 0; j < PTHREAD_KEY_2NDLEVEL_SIZE; j++) {
           destr = pthread_keys[i * PTHREAD_KEY_2NDLEVEL_SIZE + j].destr;
-          data = self->p_specific[i][j];
+          data = THREAD_GETMEM(self, p_specific[i])[j];
           if (destr != NULL && data != NULL) {
-            self->p_specific[i][j] = NULL;
+            THREAD_GETMEM(self, p_specific[i])[j] = NULL;
             destr(data);
             found_nonzero = 1;
           }
         }
   }
   for (i = 0; i < PTHREAD_KEY_1STLEVEL_SIZE; i++) {
-    if (self->p_specific[i] != NULL) free(self->p_specific[i]);
+    if (THREAD_GETMEM(self, p_specific[i]) != NULL)
+      free(THREAD_GETMEM(self, p_specific[i]));
   }
 }
 
@@ -163,7 +165,7 @@ int __libc_internal_tsd_set(enum __libc_tsd_key_t key, const void * pointer)
 {
   pthread_descr self = thread_self();
 
-  self->p_libc_specific[key] = (void *) pointer;
+  THREAD_SETMEM(self, p_libc_specific[key], (void *) pointer);
   return 0;
 }
 
@@ -171,5 +173,5 @@ void * __libc_internal_tsd_get(enum __libc_tsd_key_t key)
 {
   pthread_descr self = thread_self();
 
-  return self->p_libc_specific[key];
+  return THREAD_GETMEM(self, p_libc_specific[key]);
 }
diff --git a/linuxthreads/spinlock.c b/linuxthreads/spinlock.c
index 8a8d3bfb84..15faec0e7d 100644
--- a/linuxthreads/spinlock.c
+++ b/linuxthreads/spinlock.c
@@ -50,7 +50,7 @@ void __pthread_lock(struct _pthread_fastlock * lock)
       newstatus = (long) self;
     }
     if (self != NULL)
-      self->p_nextwaiting = (pthread_descr) oldstatus;
+      THREAD_SETMEM(self, p_nextwaiting, (pthread_descr) oldstatus);
   } while(! compare_and_swap(&lock->status, oldstatus, newstatus,
                              &lock->spinlock));
   if (oldstatus != 0) suspend(self);
diff --git a/linuxthreads/sysdeps/alpha/pt-machine.h b/linuxthreads/sysdeps/alpha/pt-machine.h
index a0c7cc77e2..41b37daf8e 100644
--- a/linuxthreads/sysdeps/alpha/pt-machine.h
+++ b/linuxthreads/sysdeps/alpha/pt-machine.h
@@ -1,6 +1,6 @@
 /* Machine-dependent pthreads configuration and inline functions.
    Alpha version.
-   Copyright (C) 1996, 1997 Free Software Foundation, Inc.
+   Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Richard Henderson <rth@tamu.edu>.
 
@@ -70,7 +70,7 @@ register char *stack_pointer __asm__("$30");
 })
 
 /* Initialize the thread-unique value.  */
-#define INIT_THREAD_SELF(descr) \
+#define INIT_THREAD_SELF(descr, nr) \
 {									      \
   register pthread_descr __self __asm__("$16") = (descr);		      \
   __asm__ __volatile__ ("call_pal %1" : : "r"(__self), "i"(PAL_wruniq));      \
diff --git a/linuxthreads/sysdeps/i386/i686/pt-machine.h b/linuxthreads/sysdeps/i386/i686/pt-machine.h
index bb0f0bc8e1..a4b3a63f1c 100644
--- a/linuxthreads/sysdeps/i386/i686/pt-machine.h
+++ b/linuxthreads/sysdeps/i386/i686/pt-machine.h
@@ -70,3 +70,7 @@ set_eflags (int newflags)
 {
   __asm__ __volatile__ ("pushl %0; popfl" : : "r" (newflags) : "cc");
 }
+
+
+/* Use the LDT implementation only if the kernel is fixed.  */
+//#include "../useldt.h"
diff --git a/linuxthreads/sysdeps/i386/useldt.h b/linuxthreads/sysdeps/i386/useldt.h
new file mode 100644
index 0000000000..2fdc0ce767
--- /dev/null
+++ b/linuxthreads/sysdeps/i386/useldt.h
@@ -0,0 +1,124 @@
+/* Special definitions for ix86 machine using segment register based
+   thread descriptor.
+   Copyright (C) 1998 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>.
+
+   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
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <stddef.h>	/* For offsetof.  */
+
+
+/* We don't want to include the kernel header.  So duplicate the
+   information.  */
+
+/* Structure passed on `modify_ldt' call.  */
+struct modify_ldt_ldt_s
+{
+  unsigned int entry_number;
+  unsigned long int base_addr;
+  unsigned int limit;
+  unsigned int seg_32bit:1;
+  unsigned int contents:2;
+  unsigned int read_exec_only:1;
+  unsigned int limit_in_pages:1;
+  unsigned int seg_not_present:1;
+  unsigned int useable:1;
+  unsigned int empty:25;
+};
+
+/* System call to set LDT entry.  */
+extern int __modify_ldt (int, struct modify_ldt_ldt_s *, size_t);
+
+
+/* Return the thread descriptor for the current thread.
+
+   The contained asm must *not* be marked volatile since otherwise
+   assignments like
+	pthread_descr self = thread_self();
+   do not get optimized away.  */
+#define THREAD_SELF \
+({									      \
+  register pthread_descr __self;					      \
+  __asm__ ("movl %%gs:%c1,%0" : "=r" (__self)				      \
+	   : "i" (offsetof (struct _pthread_descr_struct, p_self)));	      \
+  __self;								      \
+})
+
+/* Initialize the thread-unique value.  */
+#define INIT_THREAD_SELF(descr, nr) \
+{									      \
+  struct modify_ldt_ldt_s ldt_entry =					      \
+    { nr, (unsigned long int) descr, sizeof (*descr), 1, 0, 0, 0, 0, 1, 0 };  \
+  if (__modify_ldt (1, &ldt_entry, sizeof (ldt_entry)) != 0)		      \
+    abort ();								      \
+  __asm__ __volatile__ ("movw %w0, %%gs" : : "r" (nr * 8 + 7));		      \
+}
+
+/* Free resources associated with thread descriptor.  */
+#define FREE_THREAD_SELF(descr, nr) \
+{									      \
+  struct modify_ldt_ldt_s ldt_entry =					      \
+    { nr, 0, 0, 0, 0, 1, 0, 1, 0, 0 };					      \
+  __asm__ __volatile__ ("movw %w0,%%gs" : : "r" (0));			      \
+  __modify_ldt (1, &ldt_entry, sizeof (ldt_entry));			      \
+}
+
+/* Read member of the thread descriptor directly.  */
+#define THREAD_GETMEM(descr, member) \
+({									      \
+  __typeof__ (descr->member) __value;					      \
+  if (sizeof (__value) == 1)						      \
+    __asm__ __volatile__ ("movb %%gs:%c1,%b0"				      \
+			  : "=r" (__value)				      \
+			  : "0" (0),					      \
+			    "i" (offsetof (struct _pthread_descr_struct,      \
+					   member)));			      \
+  else									      \
+    {									      \
+      if (sizeof (__value) != 4)					      \
+	/* There should not be any value with a size other than 1 or 4.  */   \
+	abort ();							      \
+									      \
+      __asm__ __volatile__ ("movl %%gs:%c1,%0"				      \
+			    : "=r" (__value)				      \
+			    : "i" (offsetof (struct _pthread_descr_struct,    \
+					     member)));			      \
+    }									      \
+  __value;								      \
+})
+
+/* Set member of the thread descriptor directly.  */
+#define THREAD_SETMEM(descr, member, value) \
+({									      \
+  __typeof__ (descr->member) __value = (value);				      \
+  if (sizeof (__value) == 1)						      \
+    __asm__ __volatile__ ("movb %0,%%gs:%c1" :				      \
+			  : "r" (__value),				      \
+			    "i" (offsetof (struct _pthread_descr_struct,      \
+					   member)));			      \
+  else									      \
+    {									      \
+      if (sizeof (__value) != 4)					      \
+	/* There should not be any value with a size other than 1 or 4.  */   \
+	abort ();							      \
+									      \
+      __asm__ __volatile__ ("movl %0,%%gs:%c1" :			      \
+			    : "r" (__value),				      \
+			      "i" (offsetof (struct _pthread_descr_struct,    \
+					     member)));			      \
+    }									      \
+})
diff --git a/linuxthreads/sysdeps/sparc/sparc32/pt-machine.h b/linuxthreads/sysdeps/sparc/sparc32/pt-machine.h
index 13f78e319a..7eea8d400c 100644
--- a/linuxthreads/sysdeps/sparc/sparc32/pt-machine.h
+++ b/linuxthreads/sysdeps/sparc/sparc32/pt-machine.h
@@ -1,6 +1,6 @@
 /* Machine-dependent pthreads configuration and inline functions.
    sparc version.
-   Copyright (C) 1996, 1997 Free Software Foundation, Inc.
+   Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Richard Henderson <rth@tamu.edu>.
 
@@ -53,3 +53,7 @@ register struct _pthread_descr_struct *__thread_self __asm__("%g6");
 
 /* Initialize the thread-unique value.  */
 #define INIT_THREAD_SELF(descr)  (__thread_self = (descr))
+
+/* Access to data in the thread descriptor is easy.  */
+#define THREAD_GETMEM(descr, member) __thread_self->member
+#define THREAD_SETMEM(descr, member, value) __thread_self->member = (value)
diff --git a/linuxthreads/sysdeps/sparc/sparc64/pt-machine.h b/linuxthreads/sysdeps/sparc/sparc64/pt-machine.h
index 5424860786..e94e1a5fb2 100644
--- a/linuxthreads/sysdeps/sparc/sparc64/pt-machine.h
+++ b/linuxthreads/sysdeps/sparc/sparc64/pt-machine.h
@@ -1,6 +1,6 @@
 /* Machine-dependent pthreads configuration and inline functions.
    Sparc v9 version.
-   Copyright (C) 1997 Free Software Foundation, Inc.
+   Copyright (C) 1997, 1998 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Richard Henderson <rth@tamu.edu>.
 
@@ -65,3 +65,7 @@ __compare_and_swap (long int *p, long int oldval, long int newval)
 
   return readval == newval;
 }
+
+/* Access to data in the thread descriptor is easy.  */
+#define THREAD_GETMEM(descr, member) __thread_self->member
+#define THREAD_SETMEM(descr, member, value) __thread_self->member = (value)