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, 205 insertions, 0 deletions

diff --git a/REORG.TODO/nptl/tst-context1.c b/REORG.TODO/nptl/tst-context1.c
new file mode 100644
index 0000000000..eaccd9e88f
--- /dev/null
+++ b/REORG.TODO/nptl/tst-context1.c
@@ -0,0 +1,205 @@
+/* Copyright (C) 2003-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
+
+   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 <errno.h>
+#include <error.h>
+#include <limits.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <ucontext.h>
+
+#define N	4
+#if __WORDSIZE == 64
+#define GUARD_PATTERN 0xdeadbeafdeadbeaf
+#else
+#define GUARD_PATTERN 0xdeadbeaf
+#endif
+
+typedef struct {
+       ucontext_t uctx;
+       unsigned long	guard[3];
+   } tst_context_t;
+
+static char stacks[N][2 * PTHREAD_STACK_MIN];
+static tst_context_t ctx[N][2];
+static volatile int failures;
+
+
+static void
+fct (long int n)
+{
+  char on_stack[1];
+
+  /* Just to use the thread local descriptor.  */
+  printf ("%ld: in %s now, on_stack = %p\n", n, __FUNCTION__, on_stack);
+  errno = 0;
+
+  if (ctx[n][1].uctx.uc_link != &ctx[n][0].uctx)
+    {
+      printf ("context[%ld][1] uc_link damaged, = %p\n", n,
+	      ctx[n][1].uctx.uc_link);
+      exit (1);
+    }
+
+  if ((ctx[n][0].guard[0] != GUARD_PATTERN)
+  ||  (ctx[n][0].guard[1] != GUARD_PATTERN)
+  ||  (ctx[n][0].guard[2] != GUARD_PATTERN))
+    {
+      printf ("%ld: %s context[0] overflow detected!\n", n, __FUNCTION__);
+      ++failures;
+    }
+
+  if ((ctx[n][1].guard[0] != GUARD_PATTERN)
+  ||  (ctx[n][1].guard[1] != GUARD_PATTERN)
+  ||  (ctx[n][1].guard[2] != GUARD_PATTERN))
+    {
+      printf ("%ld: %s context[1] overflow detected!\n", n, __FUNCTION__);
+      ++failures;
+    }
+
+  if (n < 0 || n >= N)
+    {
+      printf ("%ld out of range\n", n);
+      exit (1);
+    }
+
+  if (on_stack < stacks[n] || on_stack >= stacks[n] + sizeof (stacks[0]))
+    {
+      printf ("%ld: on_stack not on appropriate stack\n", n);
+      exit (1);
+    }
+}
+
+
+static void *
+tf (void *arg)
+{
+  int n = (int) (long int) arg;
+
+  ctx[n][0].guard[0] = GUARD_PATTERN;
+  ctx[n][0].guard[1] = GUARD_PATTERN;
+  ctx[n][0].guard[2] = GUARD_PATTERN;
+
+  ctx[n][1].guard[0] = GUARD_PATTERN;
+  ctx[n][1].guard[1] = GUARD_PATTERN;
+  ctx[n][1].guard[2] = GUARD_PATTERN;
+
+  if (getcontext (&ctx[n][1].uctx) != 0)
+    {
+      printf ("%d: cannot get context: %m\n", n);
+      exit (1);
+    }
+
+  printf ("%d: %s: before makecontext\n", n, __FUNCTION__);
+
+  ctx[n][1].uctx.uc_stack.ss_sp = stacks[n];
+  ctx[n][1].uctx.uc_stack.ss_size = sizeof (stacks[n]);
+  ctx[n][1].uctx.uc_link = &ctx[n][0].uctx;
+  makecontext (&ctx[n][1].uctx, (void (*) (void)) fct, 1, (long int) n);
+
+  printf ("%d: %s: before swapcontext\n", n, __FUNCTION__);
+
+  if (swapcontext (&ctx[n][0].uctx, &ctx[n][1].uctx) != 0)
+    {
+      ++failures;
+      printf ("%d: %s: swapcontext failed\n", n, __FUNCTION__);
+    }
+  else
+    printf ("%d: back in %s\n", n, __FUNCTION__);
+
+  return NULL;
+}
+
+
+static volatile int global;
+
+
+static int
+do_test (void)
+{
+  int n;
+  pthread_t th[N];
+  ucontext_t mctx;
+
+  puts ("making contexts");
+  if (getcontext (&mctx) != 0)
+    {
+      if (errno == ENOSYS)
+	{
+	  puts ("context handling not supported");
+	  exit (0);
+	}
+
+      printf ("%s: getcontext: %m\n", __FUNCTION__);
+      exit (1);
+    }
+
+  /* Play some tricks with this context.  */
+  if (++global == 1)
+    if (setcontext (&mctx) != 0)
+      {
+	puts ("setcontext failed");
+	exit (1);
+      }
+  if (global != 2)
+    {
+      puts ("global not incremented twice");
+      exit (1);
+    }
+  puts ("global OK");
+
+  pthread_attr_t at;
+
+  if (pthread_attr_init (&at) != 0)
+    {
+      puts ("attr_init failed");
+      return 1;
+    }
+
+  if (pthread_attr_setstacksize (&at, 1 * 1024 * 1024) != 0)
+    {
+      puts ("attr_setstacksize failed");
+      return 1;
+    }
+
+  for (n = 0; n < N; ++n)
+    if (pthread_create (&th[n], &at, tf, (void *) (long int) n) != 0)
+      {
+	puts ("create failed");
+	exit (1);
+      }
+
+  if (pthread_attr_destroy (&at) != 0)
+    {
+      puts ("attr_destroy failed");
+      return 1;
+    }
+
+  for (n = 0; n < N; ++n)
+    if (pthread_join (th[n], NULL) != 0)
+      {
+	puts ("join failed");
+	exit (1);
+      }
+
+  return failures;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"