Prepare for radical source tree reorganization. zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 159 insertions, 0 deletions

diff --git a/REORG.TODO/nptl/tst-stack4.c b/REORG.TODO/nptl/tst-stack4.c
new file mode 100644
index 0000000000..eed7c58a9d
--- /dev/null
+++ b/REORG.TODO/nptl/tst-stack4.c
@@ -0,0 +1,159 @@
+/* Test DTV size oveflow when pthread_create reuses old DTV and TLS is
+   used by dlopened shared object.
+   Copyright (C) 2014-2017 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/>.  */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <dlfcn.h>
+#include <assert.h>
+#include <pthread.h>
+
+/* The choices of thread count, and file counts are arbitary.
+   The point is simply to run enough threads that an exiting
+   thread has it's stack reused by another thread at the same
+   time as new libraries have been loaded.  */
+#define DSO_SHARED_FILES 20
+#define DSO_OPEN_THREADS 20
+#define DSO_EXEC_THREADS 2
+
+/* Used to make sure that only one thread is calling dlopen and dlclose
+   at a time.  */
+pthread_mutex_t g_lock;
+
+typedef void (*function) (void);
+
+void *
+dso_invoke(void *dso_fun)
+{
+  function *fun_vec = (function *) dso_fun;
+  int dso;
+
+  for (dso = 0; dso < DSO_SHARED_FILES; dso++)
+    (*fun_vec[dso]) ();
+
+  pthread_exit (NULL);
+}
+
+void *
+dso_process (void * p)
+{
+  void *handle[DSO_SHARED_FILES];
+  function fun_vec[DSO_SHARED_FILES];
+  char dso_path[DSO_SHARED_FILES][100];
+  int dso;
+  int t = (int) (uintptr_t) p;
+
+  /* Open DSOs and get a function.  */
+  for (dso = 0; dso < DSO_SHARED_FILES; dso++)
+    {
+      sprintf (dso_path[dso], "tst-stack4mod-%i-%i.so", t, dso);
+
+      pthread_mutex_lock (&g_lock);
+
+      handle[dso] = dlopen (dso_path[dso], RTLD_NOW);
+      assert (handle[dso]);
+
+      fun_vec[dso] = (function) dlsym (handle[dso], "function");
+      assert (fun_vec[dso]);
+
+      pthread_mutex_unlock (&g_lock);
+    }
+
+  /* Spawn workers.  */
+  pthread_t thread[DSO_EXEC_THREADS];
+  int i, ret;
+  uintptr_t result = 0;
+  for (i = 0; i < DSO_EXEC_THREADS; i++)
+    {
+      pthread_mutex_lock (&g_lock);
+      ret = pthread_create (&thread[i], NULL, dso_invoke, (void *) fun_vec);
+      if (ret != 0)
+	{
+	  printf ("pthread_create failed: %d\n", ret);
+	  result = 1;
+	}
+      pthread_mutex_unlock (&g_lock);
+    }
+
+  if (!result)
+    for (i = 0; i < DSO_EXEC_THREADS; i++)
+      {
+	ret = pthread_join (thread[i], NULL);
+	if (ret != 0)
+	  {
+	    printf ("pthread_join failed: %d\n", ret);
+	    result = 1;
+	  }
+      }
+
+  /* Close all DSOs.  */
+  for (dso = 0; dso < DSO_SHARED_FILES; dso++)
+    {
+      pthread_mutex_lock (&g_lock);
+      dlclose (handle[dso]);
+      pthread_mutex_unlock (&g_lock);
+    }
+
+  /* Exit.  */
+  pthread_exit ((void *) result);
+}
+
+static int
+do_test (void)
+{
+  pthread_t thread[DSO_OPEN_THREADS];
+  int i,j;
+  int ret;
+  int result = 0;
+
+  pthread_mutex_init (&g_lock, NULL);
+
+  /* 100 is arbitrary here and is known to trigger PR 13862.  */
+  for (j = 0; j < 100; j++)
+    {
+      for (i = 0; i < DSO_OPEN_THREADS; i++)
+	{
+	  ret = pthread_create (&thread[i], NULL, dso_process,
+				(void *) (uintptr_t) i);
+	  if (ret != 0)
+	    {
+	      printf ("pthread_create failed: %d\n", ret);
+	      result = 1;
+	    }
+	}
+
+      if (result)
+	break;
+
+      for (i = 0; i < DSO_OPEN_THREADS; i++)
+	{
+	  ret = pthread_join (thread[i], NULL);
+	  if (ret != 0)
+	    {
+	      printf ("pthread_join failed: %d\n", ret);
+	      result = 1;
+	    }
+	}
+    }
+
+  return result;
+}
+
+#define TEST_FUNCTION do_test ()
+#define TIMEOUT 100
+#include "../test-skeleton.c"