/* 
Serval DNA file descriptor queue
Copyright (C) 2012-2013 Serval Project, 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 2
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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/

#ifndef __SERVALDNA__FDQUEUE_H
#define __SERVALDNA__FDQUEUE_H

#ifdef HAVE_POLL_H
#include <poll.h>
#endif
#include "os.h"
#include "log.h"

struct profile_total {
  struct profile_total *_next;
  int _initialised;
  const char *name;
  time_ms_t max_time;
  time_ms_t total_time;
  time_ms_t child_time;
  int calls;
};

struct call_stats{
  time_ms_t enter_time;
  time_ms_t child_time;
  struct profile_total *totals;
  struct call_stats *prev;
};

struct sched_ent;

typedef void (*ALARM_FUNCP) (struct sched_ent *alarm);

struct sched_ent{
  struct sched_ent *_next;
  struct sched_ent *_prev;
  
  ALARM_FUNCP function;
  void *context;
  struct pollfd poll;
  // when we should first consider the alarm
  time_ms_t alarm;
  // the order we will prioritise the alarm
  time_ms_t deadline;
  struct profile_total *stats;
  int _poll_index;
};

int is_scheduled(const struct sched_ent *alarm);
int _schedule(struct __sourceloc, struct sched_ent *alarm);
int _unschedule(struct __sourceloc, struct sched_ent *alarm);
int _watch(struct __sourceloc, struct sched_ent *alarm);
int _unwatch(struct __sourceloc, struct sched_ent *alarm);
#define schedule(alarm)   _schedule(__WHENCE__, alarm)
#define unschedule(alarm) _unschedule(__WHENCE__, alarm)
#define watch(alarm)      _watch(__WHENCE__, alarm)
#define unwatch(alarm)    _unwatch(__WHENCE__, alarm)
int fd_poll();

/* function timing routines */
int fd_clearstats();
int fd_showstats();
int fd_checkalarms();
int fd_func_enter(struct __sourceloc, struct call_stats *this_call);
int fd_func_exit(struct __sourceloc, struct call_stats *this_call);
void dump_stack(int log_level);
unsigned fd_depth();

#define IN() static struct profile_total _aggregate_stats={NULL,0,__FUNCTION__,0,0,0,0}; \
    struct call_stats _this_call={.totals=&_aggregate_stats}; \
    fd_func_enter(__HERE__, &_this_call);

#define OUT() fd_func_exit(__HERE__, &_this_call)
#define RETURN(X) do { OUT(); return (X); } while (0)
#define RETURNNULL(X) do { X; OUT(); return (NULL); } while (0)
#define RETURNVOID do { OUT(); return; } while (0)

#endif // __SERVALDNA__FDQUEUE_H