Merge GDB 7.5.1

gdb/testsuite/gdb.threads/sigstep-threads.c

 /* This testcase is part of GDB, the GNU debugger.
 
-   Copyright 2008-2012 Free Software Foundation, Inc.
+   Copyright 2010-2012 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 <assert.h>
+#include <signal.h>
+
+#include <asm/unistd.h>
 #include <unistd.h>
+#define tgkill(tgid, tid, sig) syscall (__NR_tgkill, (tgid), (tid), (sig))
+#define gettid() syscall (__NR_gettid)
+
+static volatile int var;
+
+static void
+handler (int signo)     /* step-0 */
+{                       /* step-0 */
+  var++;                /* step-1 */
+  tgkill (getpid (), gettid (), SIGUSR1);       /* step-2 */
+}
 
 static void *
 start (void *arg)
 {
+  tgkill (getpid (), gettid (), SIGUSR1);
   assert (0);
-  return arg;
+  return NULL;
 }
 
-int main(void)
+int
+main (void)
 {
   pthread_t thread;
-  int i;
 
-  switch (fork ())
-    {
-    case -1:
-      assert (0);
-    default:
-      break;
-    case 0:
-      i = pthread_create (&thread, NULL, start, NULL);
-      assert (i == 0);
-      i = pthread_join (thread, NULL);
-      assert (i == 0);
+  signal (SIGUSR1, handler);
 
-      assert (0);
-    }
-
+  pthread_create (&thread, NULL, start, NULL);
+  start (NULL); /* main-start */
   return 0;
 }