1  /* Avoiding the synchronizations are a good thing.  */
       2  #define WANT_SPECIALCASE_RELAXED
       3  #define WANT_SPECIALCASE_ACQREL
       4  
       5  /* Glibc, at least, uses lwsync (aka acq_rel) in its pthread mutex
       6     implementation.  If the user is asking for seq_cst (aka hwsync),
       7     this is insufficient.  */
       8  
       9  static inline void __attribute__((always_inline, artificial))
      10  pre_seq_barrier(int model)
      11  {
      12    if (model == __ATOMIC_SEQ_CST)
      13      __atomic_thread_fence (__ATOMIC_SEQ_CST);
      14  }
      15  
      16  static inline void __attribute__((always_inline, artificial))
      17  post_seq_barrier(int model)
      18  {
      19    pre_seq_barrier(model);
      20  }
      21  
      22  #define pre_post_seq_barrier 1
      23  
      24  #include_next <host-config.h>