2011-10-28 Pedro Alves <pedro@codesourcery.com>

	gdb/
	* linux-nat.c (linux_nat_filter_event): Remove `options'
	parameter, and dead code that used it.  If we're handling a
	PTRACE_EVENT_EXEC event, and the thread group leader is no longer
	in our lwp list, re-add it.
	(check_zombie_leaders): New.
	(linux_nat_wait_1): Remove `options' and `pid' locals.  Always
	wait for children with WNOHANG, and always wait for all children.
	Don't check for no resumed children upfront.  Simplify wait loop.
	Check for zombie thread group leaders after handling all wait
	statuses.  Return TARGET_WAITKIND_NO_RESUMED if there no
	unwaited-for children left.
	* infrun.c (fetch_inferior_event): Handle TARGET_WAITKIND_NO_RESUMED.
	(handle_inferior_event): Handle TARGET_WAITKIND_NO_RESUMED.
	(normal_stop): Handle TARGET_WAITKIND_NO_RESUMED.
	* target.h (enum target_waitkind) <TARGET_WAITKIND_NO_RESUMED>: New.

	gdb/testsuite/
	* gdb.threads/no-unwaited-for-left.c: New.
	* gdb.threads/no-unwaited-for-left.exp: New.
	* gdb.threads/non-ldr-exc-1.c: New.
	* gdb.threads/non-ldr-exc-1.exp: New.
	* gdb.threads/non-ldr-exc-2.c: New.
	* gdb.threads/non-ldr-exc-2.exp: New.
	* gdb.threads/non-ldr-exc-3.c: New.
	* gdb.threads/non-ldr-exc-3.exp: New.
	* gdb.threads/non-ldr-exc-4.c: New.
	* gdb.threads/non-ldr-exc-4.exp: New.

1 files changed, 100 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.threads/non-ldr-exc-3.c b/gdb/testsuite/gdb.threads/non-ldr-exc-3.c
new file mode 100644
index 0000000..64597e4
--- /dev/null
+++ b/gdb/testsuite/gdb.threads/non-ldr-exc-3.c
@@ -0,0 +1,100 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2009, 2010, 2011 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <pthread.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <assert.h>
+
+static const char *image;
+static volatile pthread_t main_thread;
+static pthread_barrier_t barrier;
+static char *argv1 = "go away";
+
+static void *
+thread_execler (void *arg)
+{
+  int i;
+
+  pthread_barrier_wait (&barrier);
+
+  i = pthread_join (main_thread, NULL);
+  assert (i == 0);
+
+  /* Exec ourselves again.  */
+  if (execl (image, image, argv1, NULL) == -1) /* break-here */
+    {
+      perror ("execl");
+      abort ();
+    }
+
+  return NULL;
+}
+
+static void *
+just_loop (void *arg)
+{
+  unsigned int i;
+
+  pthread_barrier_wait (&barrier);
+
+  for (i = 1; i > 0; i++)
+    usleep (1);
+
+  return NULL;
+}
+
+#define THREADS 5
+
+pthread_t loop_thread[THREADS];
+
+int
+main (int argc, char **argv)
+{
+  pthread_t thread;
+  int i, t;
+
+  image = argv[0];
+
+  /* Pass "inf" as argument to keep re-execing ad infinitum, which can
+     be useful for manual testing.  Passing any other argument exits
+     immediately (and that's what the execl above does by
+     default).  */
+  if (argc == 2 && strcmp (argv[1], "inf") == 0)
+    argv1 = argv[1];
+  else if (argc > 1)
+    exit (0);
+
+  main_thread = pthread_self ();
+
+  pthread_barrier_init (&barrier, NULL, 2 + THREADS);
+
+  i = pthread_create (&thread, NULL, thread_execler, NULL);
+  assert (i == 0);
+
+  for (t = 0; t < THREADS; t++)
+    {
+      i = pthread_create (&loop_thread[t], NULL, just_loop, NULL);
+      assert (i == 0);
+    }
+
+  pthread_barrier_wait (&barrier);
+
+  pthread_exit (NULL);
+  /* NOTREACHED */
+  return 0;
+}