Merge GDB 7.5.1

gdb/testsuite/gdb.threads/clone-new-thread-event.c

 /* This testcase is part of GDB, the GNU debugger.
 
    Copyright 2009-2012 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/>.
 
-   Do not use threads as we need to exploit a bug in LWP code masked by the
-   threads code otherwise.
-
-   INFERIOR_PTID must point to exited LWP.  Here we use the initial LWP as it
-   is automatically INFERIOR_PTID for GDB.
-
-   Finally we need to call target_resume (RESUME_ALL, ...) which we invoke by
-   NEW_THREAD_EVENT (called from the new LWP as initial LWP is exited now).  */
+   Test that GDB doesn't lose an event for a thread it didn't know
+   about, until an event is reported for it.  */
 
 #define _GNU_SOURCE
 #include <sched.h>
 #include <assert.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <sys/types.h>
 #include <unistd.h>
-#include <stdlib.h>
+#include <sys/syscall.h>
 
 #include <features.h>
 #ifdef __UCLIBC__
 #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__))
 #define HAS_NOMMU
 #endif
 #endif
 
 #define STACK_SIZE 0x1000
 
 static int
-fn_return (void *unused)
+tkill (int lwpid, int signo)
 {
-  return 0;     /* at-fn_return */
+  return syscall (__NR_tkill, lwpid, signo);
+}
+
+static pid_t
+gettid (void)
+{
+  return syscall (__NR_gettid);
 }
 
 static int
 fn (void *unused)
 {
-  int i;
-  unsigned char *stack;
-  int new_pid;
-
-  i = sleep (1);
-  assert (i == 0);
-
-  stack = malloc (STACK_SIZE);
-  assert (stack != NULL);
-
-  new_pid = clone (fn_return, stack + STACK_SIZE, CLONE_FILES
-#if defined(__UCLIBC__) && defined(HAS_NOMMU)
-                   | CLONE_VM
-#endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
-                   , NULL, NULL, NULL, NULL);
-  assert (new_pid > 0);
-
+  tkill (gettid (), SIGUSR1);
   return 0;
 }
 
 int
 main (int argc, char **argv)
 {
   unsigned char *stack;
   int new_pid;
 
   stack = malloc (STACK_SIZE);
   assert (stack != NULL);
 
   new_pid = clone (fn, stack + STACK_SIZE, CLONE_FILES
 #if defined(__UCLIBC__) && defined(HAS_NOMMU)
                    | CLONE_VM
 #endif /* defined(__UCLIBC__) && defined(HAS_NOMMU) */
                    , NULL, NULL, NULL, NULL);
   assert (new_pid > 0);
 
   return 0;
 }