Merge GDB 7.5.1

gdb/testsuite/gdb.threads/watchpoint-fork-mt.c

+/* Test case for forgotten hw-watchpoints after fork()-off of a process.
+
+   Copyright 2012 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   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 2 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, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <assert.h>
+#include <unistd.h>
+#include <sys/wait.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <pthread.h>
+
+#include <asm/unistd.h>
+#include <unistd.h>
+#define gettid() syscall (__NR_gettid)
+
+#include "watchpoint-fork.h"
+
+/* Non-atomic `var++' should not hurt as we synchronize the threads by the STEP
+   variable.  Hit-comments need to be duplicated there to catch both at-stops
+   and behind-stops, depending on the target.  */
+
+volatile int var;
+
+void
+marker (void)
+{
+}
+
+static void
+empty (void)
+{
+}
+
+static void
+mark_exit (void)
+{
+}
+
+pthread_t thread;
+volatile int step;
+
+static void *
+start (void *arg)
+{
+  int i;
+
+  if (step >= 3)
+    goto step_3;
+
+  while (step != 1)
+    {
+      i = pthread_yield ();
+      assert (i == 0);
+    }
+
+  var++;        /* validity-thread-B */
+  empty ();     /* validity-thread-B */
+  step = 2;
+  while (step != 3)
+    {
+      if (step == 99)
+        goto step_99;
+
+      i = pthread_yield ();
+      assert (i == 0);
+    }
+
+step_3:
+  if (step >= 5)
+    goto step_5;
+
+  var++;        /* after-fork1-B */
+  empty ();     /* after-fork1-B */
+  step = 4;
+  while (step != 5)
+    {
+      if (step == 99)
+        goto step_99;
+
+      i = pthread_yield ();
+      assert (i == 0);
+    }
+
+step_5:
+  var++;        /* after-fork2-B */
+  empty ();     /* after-fork2-B */
+  return (void *) 5UL;
+
+step_99:
+  /* We must not get caught here (against a forgotten breakpoint).  */
+  var++;
+  marker ();
+  return (void *) 99UL;
+}
+
+int
+main (void)
+{
+  int i;
+  void *thread_result;
+
+  setbuf (stdout, NULL);
+  printf ("main: %d\n", (int) gettid ());
+
+  /* General hardware breakpoints and watchpoints validity.  */
+  marker ();
+  var++;        /* validity-first */
+  empty ();     /* validity-first */
+
+  i = pthread_create (&thread, NULL, start, NULL);
+  assert (i == 0);
+
+  var++;        /* validity-thread-A */
+  empty ();     /* validity-thread-A */
+  step = 1;
+  while (step != 2)
+    {
+      i = pthread_yield ();
+      assert (i == 0);
+    }
+
+  /* Hardware watchpoints got disarmed here.  */
+  forkoff (1);
+
+  var++;        /* after-fork1-A */
+  empty ();     /* after-fork1-A */
+  step = 3;
+#ifdef FOLLOW_CHILD
+  /* Spawn new thread as it was deleted in the child of FORK.  */
+  i = pthread_create (&thread, NULL, start, NULL);
+  assert (i == 0);
+#endif
+  while (step != 4)
+    {
+      i = pthread_yield ();
+      assert (i == 0);
+    }
+
+  /* A sanity check for double hardware watchpoints removal.  */
+  forkoff (2);
+
+  var++;        /* after-fork2-A */
+  empty ();     /* after-fork2-A */
+  step = 5;
+#ifdef FOLLOW_CHILD
+  /* Spawn new thread as it was deleted in the child of FORK.  */
+  i = pthread_create (&thread, NULL, start, NULL);
+  assert (i == 0);
+#endif
+
+  i = pthread_join (thread, &thread_result);
+  assert (i == 0);
+  assert (thread_result == (void *) 5UL);
+
+  mark_exit ();
+  return 0;
+}