1  /* { dg-do compile } */
       2  /* { dg-options "-O3 -fcompare-debug -w" } */
       3  
       4  extern void rt_mutex_owner (void);
       5  extern void rt_mutex_deadlock_account_lock (int);
       6  extern void signal_pending (void);
       7  __typeof__ (int *) a;
       8  int b;
       9  
      10  int
      11  try_to_take_rt_mutex (int p1) {
      12    rt_mutex_owner ();
      13    if (b)
      14      return 0;
      15    rt_mutex_deadlock_account_lock (p1);
      16    return 1;
      17  }
      18  
      19  void
      20  __rt_mutex_slowlock (int p1) {
      21    int c;
      22    for (;;) {
      23      c = ({
      24        asm ("" : "=r"(a));
      25        a;
      26      });
      27      if (try_to_take_rt_mutex (c))
      28        break;
      29      if (__builtin_expect (p1 == 0, 0))
      30        signal_pending ();
      31    }
      32  }