#ifndef WH_IMPL_H_b516b12a_
#define WH_IMPL_H_b516b12a_

/* This file is in the public domain. */

#include <poll.h>

#include "aio.h"

typedef struct blockfn BLOCKFN;
typedef struct bimpl BIMPL;
typedef struct iofd IOFD;

struct aio_loop {
  IOFD **iofds;
  int niofds;
  void *bfns;
  struct pollfd *pfds;
  int pfdn;
  int pfdmax;
  int haveblock;
  int justloop;
  int addedblock;
  } ;

struct blockfn {
  int (*fn)(void *);
  void *arg;
  unsigned int flags;
#define BFF_DEAD 0x00000001
  } ;

struct bimpl {
  void *(*init)(void);
  void (*cleanup)(void *);
  int (*validid)(void *, int);
  int (*new)(void *, BLOCKFN *);
  void (*remove)(void *, int);
  int (*anyblock)(void *);
  void (*iter)(AIO_LOOP **, int, int (*)(BLOCKFN *, void *), void *);
  int (*getorder)(void *, int);
  } ;
#define BIMPL_INIT(prefix) {\
	&prefix##_init,				\
	&prefix##_cleanup,			\
	&prefix##_validid,			\
	&prefix##_new,				\
	&prefix##_remove,			\
	&prefix##_anyblock,			\
	&prefix##_iter,				\
	&prefix##_getorder			\
	}

#define panic aio__panic
extern void aio__panic(const char *, ...)
	__attribute__((__format__(__printf__,1,2)));

#define dequal(x) (((char *)0)+(((const volatile char *)(x))-((const volatile char *)0)))

extern char aio__order_used __attribute__((__weak__));
extern BIMPL aio__bimpl_simple; // see block-simple.c for why not weak
extern BIMPL aio__bimpl_avl __attribute__((__weak__));

extern int aio__internalize_block_id(AIO_LOOP *, int);

#ifdef DEBUG_BUILD
extern void aio__trace_s(const char *);
extern void aio__trace_append(const void *, int);
extern int aio__tracing(void);
#else
#define aio__trace_s(x) do ; while (0)
#define aio__trace_append(x,y) do ; while (0)
#define aio__tracing() (0)
#endif

#endif