Test *context functions in threads.

1 files changed, 132 insertions, 0 deletions

diff --git a/nptl/tst-context1.c b/nptl/tst-context1.c
new file mode 100644
index 0000000000..0edee00c7a
--- /dev/null
+++ b/nptl/tst-context1.c
@@ -0,0 +1,132 @@
+/* Copyright (C) 2003 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <errno.h>
+#include <error.h>
+#include <limits.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <ucontext.h>
+
+
+#define N	4
+
+static char stacks[N][PTHREAD_STACK_MIN];
+static ucontext_t ctx[N][2];
+static volatile int failures;
+
+
+static void
+fct (long int n)
+{
+  /* Just to use the thread local descriptor.  */
+  printf ("%ld: in %s now\n", n, __FUNCTION__);
+  errno = 0;
+}
+
+
+static void *
+tf (void *arg)
+{
+  int n = (int) (long int) arg;
+
+  if (getcontext (&ctx[n][1]) != 0)
+    {
+      printf ("%d: cannot get context: %m\n", n);
+      exit (1);
+    }
+
+  printf ("%d: %s: before makecontext\n", n, __FUNCTION__);
+
+  ctx[n][1].uc_stack.ss_sp = stacks[n];
+  ctx[n][1].uc_stack.ss_size = PTHREAD_STACK_MIN;
+  ctx[n][1].uc_link = &ctx[n][0];
+  makecontext (&ctx[n][1], (void (*) (void)) fct, 1, (long int) n);
+
+  printf ("%d: %s: before swapcontext\n", n, __FUNCTION__);
+
+  if (swapcontext (&ctx[n][0], &ctx[n][1]) != 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");
+
+  for (n = 0; n < N; ++n)
+    if (pthread_create (&th[n], NULL, tf, (void *) (long int) n) != 0)
+      {
+	puts ("create failed");
+	exit (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"