gcc/testsuite/gcc.dg/980709-1.c

   1 /* { dg-do compile { target i?86-*-* } } */
   2 /* { dg-options -O2 } */
   3
   4 extern __inline__ int test_and_set_bit(int nr, volatile void * addr)
   5 {
   6         int oldbit;
   7         __asm__ __volatile__( ""
   8                 "btsl %2,%1\n\tsbbl %0,%0"
   9                 :"=r" (oldbit),"=m" (addr)
  10                 :"ir" (nr));
  11         return oldbit;
  12 }
  13 struct buffer_head {
  14         unsigned long b_state;
  15 };
  16 extern void lock_buffer(struct buffer_head * bh)
  17 {
  18         while (test_and_set_bit(2 , &bh->b_state))
  19                 __wait_on_buffer(bh);
  20 }