Revert "Async-signal safe TLS."

This reverts commit 7f507ee17aee720fa423fa38502bc3caa0dd03d7.

Conflicts:
	ChangeLog
	nptl/tst-tls7.c
	nptl/tst-tls7mod.c

5 files changed, 7 insertions, 210 deletions

diff --git a/nptl/ChangeLog b/nptl/ChangeLog
index 003e290..a4d3f45 100644
--- a/nptl/ChangeLog
+++ b/nptl/ChangeLog
@@ -19,14 +19,7 @@
 	(do_test): Call it.
 	* tst-tls7mod.c (action): Move sem_post to caller.
 
-2014-01-03  Andrew Hunter  <ahh@google.com>
-
-	* nptl/Makefile (tst-tls7): New test.
-	* nptl/tst-tls7.c: New file.
-	* nptl/tst-tls7mod.c: New file.
-	* nptl/allocatestack.c (init_one_static_tls): Use atomic barrier.
-
-2013-12-12  Adhemerval Zanella  <azanella@linux.vnet.ibm.com>
+2011-12-12  Adhemerval Zanella  <azanella@linux.vnet.ibm.com>
 
 	* sysdeps/powerpc/tls.h (struct tcbhead_t): Add DSO and TAR fields.
 	* nptl/sysdeps/powerpc/tcb-offsets.sym: Likewise.
diff --git a/nptl/Makefile b/nptl/Makefile
index a43e740..57cc8c6 100644
--- a/nptl/Makefile
+++ b/nptl/Makefile
@@ -293,7 +293,7 @@ tests += tst-cancelx2 tst-cancelx3 tst-cancelx4 tst-cancelx5 \
 	 tst-oncex3 tst-oncex4
 endif
 ifeq ($(build-shared),yes)
-tests += tst-atfork2 tst-tls3 tst-tls4 tst-tls5 tst-tls7 tst-_res1 tst-fini1 \
+tests += tst-atfork2 tst-tls3 tst-tls4 tst-tls5 tst-_res1 tst-fini1 \
 	 tst-stackguard1
 tests-nolibpthread += tst-fini1
 ifeq ($(have-z-execstack),yes)
@@ -304,8 +304,7 @@ endif
 modules-names = tst-atfork2mod tst-tls3mod tst-tls4moda tst-tls4modb \
 		tst-tls5mod tst-tls5moda tst-tls5modb tst-tls5modc \
 		tst-tls5modd tst-tls5mode tst-tls5modf \
-		tst-_res1mod1 tst-_res1mod2 tst-execstack-mod tst-fini1mod \
-		tst-tls7mod
+		tst-_res1mod1 tst-_res1mod2 tst-execstack-mod tst-fini1mod
 extra-test-objs += $(addsuffix .os,$(strip $(modules-names))) tst-cleanup4aux.o
 test-extras += $(modules-names) tst-cleanup4aux
 test-modules = $(addprefix $(objpfx),$(addsuffix .so,$(modules-names)))
@@ -319,7 +318,6 @@ tst-tls5modc.so-no-z-defs = yes
 tst-tls5modd.so-no-z-defs = yes
 tst-tls5mode.so-no-z-defs = yes
 tst-tls5modf.so-no-z-defs = yes
-tst-tls7mod.so-no-z-defs = yes
 
 ifeq ($(build-shared),yes)
 # Build all the modules even when not actually running test programs.
@@ -482,12 +480,6 @@ $(objpfx)tst-tls5: $(objpfx)tst-tls5mod.so $(shared-thread-library)
 LDFLAGS-tst-tls5 = $(no-as-needed)
 LDFLAGS-tst-tls5mod.so = -Wl,-soname,tst-tls5mod.so
 
-# ensure free(malloc()) isn't optimized out
-CFLAGS-tst-tls7.c = -fno-builtin-malloc -fno-builtin-free
-$(objpfx)tst-tls7: $(libdl) $(shared-thread-library)
-$(objpfx)tst-tls7.out: $(objpfx)tst-tls7mod.so
-$(objpfx)tst-tls7mod.so: $(shared-thread-library)
-
 ifeq ($(build-shared),yes)
 ifeq ($(run-built-tests),yes)
 tests: $(objpfx)tst-tls6.out
diff --git a/nptl/allocatestack.c b/nptl/allocatestack.c
index 2a5ac22..7f6094e 100644
--- a/nptl/allocatestack.c
+++ b/nptl/allocatestack.c
@@ -1173,18 +1173,13 @@ init_one_static_tls (struct pthread *curp, struct link_map *map)
 #  error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
 # endif
 
-  /* Initialize the memory.  */
-  memset (__mempcpy (dest, map->l_tls_initimage, map->l_tls_initimage_size),
-	  '\0', map->l_tls_blocksize - map->l_tls_initimage_size);
-
   /* Fill in the DTV slot so that a later LD/GD access will find it.  */
-  dtv[map->l_tls_modid].pointer.is_static = true;
-  /* Pairs against the read barrier in tls_get_attr_tail, guaranteeing
-     any thread waiting for an update to pointer.val sees the
-     initimage write.  */
-  atomic_write_barrier ();
   dtv[map->l_tls_modid].pointer.val = dest;
+  dtv[map->l_tls_modid].pointer.is_static = true;
 
+  /* Initialize the memory.  */
+  memset (__mempcpy (dest, map->l_tls_initimage, map->l_tls_initimage_size),
+	  '\0', map->l_tls_blocksize - map->l_tls_initimage_size);
 }
 
 void
diff --git a/nptl/tst-tls7.c b/nptl/tst-tls7.c
deleted file mode 100644
index 3e85a6e..0000000
--- a/nptl/tst-tls7.c
+++ /dev/null
@@ -1,143 +0,0 @@
-/* Copyright (C) 2013 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
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 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
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-
-/* This test checks that TLS in a dlopened object works when first accessed
-   from a signal handler.  */
-
-#include <assert.h>
-#include <atomic.h>
-#include <dlfcn.h>
-#include <pthread.h>
-#include <semaphore.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-void *
-spin (void *ignored)
-{
-  while (1)
-    {
-      /* busywork */
-      free (malloc (128));
-    }
-
-  /* never reached */
-  return NULL;
-}
-
-static void (*tls7mod_action) (int, siginfo_t *, void *);
-
-static void
-action (int signo, siginfo_t *info, void *ignored)
-{
-  sem_t *sem = info->si_value.sival_ptr;
-
-  atomic_read_barrier ();
-  assert (tls7mod_action != NULL);
-  (*tls7mod_action) (signo, info, ignored);
-
-  /* This sem_post may trigger dlclose, which will invalidate tls7mod_action.
-     It is important to do that only after tls7mod_action is no longer
-     active.  */
-  sem_post (sem);
-}
-
-int
-do_test (void)
-{
-  pthread_t th[10];
-
-  for (int i = 0; i < 10; ++i)
-    {
-      if (pthread_create (&th[i], NULL, spin, NULL))
-        {
-          puts ("pthread_create failed");
-          exit (1);
-        }
-    }
-#define NITERS 75
-
-  for (int i = 0; i < NITERS; ++i)
-    {
-      void *h = dlopen ("tst-tls7mod.so", RTLD_LAZY);
-      if (h == NULL)
-        {
-          puts ("dlopen failed");
-          exit (1);
-        }
-
-      tls7mod_action = dlsym (h, "action");
-      if (tls7mod_action == NULL)
-        {
-          puts ("dlsym for action failed");
-          exit (1);
-        }
-      atomic_write_barrier ();
-
-      struct sigaction sa;
-      sa.sa_sigaction = action;
-      sigemptyset (&sa.sa_mask);
-      sa.sa_flags = SA_SIGINFO;
-      if (sigaction (SIGUSR1, &sa, NULL))
-        {
-          puts ("sigaction failed");
-          exit (1);
-        }
-
-      sem_t sem;
-      if (sem_init (&sem, 0, 0))
-        {
-          puts ("sem_init failed");
-        }
-
-      sigval_t val;
-      val.sival_ptr = &sem;
-      for (int i = 0; i < 10; ++i)
-        {
-          if (pthread_sigqueue (th[i], SIGUSR1, val))
-            {
-              puts ("pthread_sigqueue failed");
-            }
-        }
-
-
-      for (int i = 0; i < 10; ++i)
-        {
-          if (sem_wait (&sem))
-          {
-            puts ("sem_wait failed");
-          }
-        }
-
-      /* Paranoia.  */
-      tls7mod_action = NULL;
-
-      if (dlclose (h))
-        {
-          puts ("dlclose failed");
-          exit (1);
-        }
-    }
-  return 0;
-}
-
-#define TIMEOUT 8
-
-#define TEST_FUNCTION do_test ()
-#include "../test-skeleton.c"
diff --git a/nptl/tst-tls7mod.c b/nptl/tst-tls7mod.c
deleted file mode 100644
index da5af56..0000000
--- a/nptl/tst-tls7mod.c
+++ /dev/null
@@ -1,40 +0,0 @@
-/* Copyright (C) 2013 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
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 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
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-/* Dynamic module with TLS to be accessed by a signal handler to check safety
-   of that mode. */
-
-#include <semaphore.h>
-#include <signal.h>
-#include <unistd.h>
-
-/* This is an unlikely value to see in incorrectly initialized TLS
-   block -- make sure we're initialized properly. */
-static __thread intptr_t tls_data = 0xdeadbeef;
-
-void
-action (int signo, siginfo_t *info, void *ignored)
-{
-  if (tls_data != 0xdeadbeef)
-    {
-      write (STDOUT_FILENO, "wrong TLS value\n", 17);
-      _exit (1);
-    }
-
-  /* arbitrary choice, just write something unique-ish. */
-  tls_data = (intptr_t) info;
-}