/* Pinos
 * Copyright (C) 2015 Wim Taymans <wim.taymans@gmail.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#ifndef __PINOS_SIGNAL_H__
#define __PINOS_SIGNAL_H__

#include <spa/include/spa/list.h>

#ifdef __cplusplus
extern "C" {
#endif

typedef struct _PinosSignal PinosSignal;
typedef struct _PinosListener PinosListener;

struct _PinosListener {
  SpaList         link;
  void (*notify) (void *);
};

#define PINOS_SIGNAL(name,func)                                         \
  union {                                                               \
    SpaList listeners;                                                  \
    void (*notify) func;                                                \
  } name;

#define pinos_signal_init(signal)                                       \
  spa_list_init (&(signal)->listeners);

#define pinos_signal_add(signal,listener,func)                          \
  do {                                                                  \
    __typeof__((signal)->notify) n = (func);                            \
    (listener)->notify = (void (*) (void *)) n;                         \
    spa_list_insert ((signal)->listeners.prev, &(listener)->link);      \
  } while (false);

static inline void
pinos_signal_remove (PinosListener *listener)
{
  spa_list_remove (&listener->link);
}

#define pinos_signal_emit(signal,...)                                   \
  do {                                                                  \
    PinosListener *l, *next;                                            \
    spa_list_for_each_safe (l, next, &(signal)->listeners, link)        \
      ((__typeof__((signal)->notify))l->notify) (l,__VA_ARGS__);        \
  } while (false);

#ifdef __cplusplus
}
#endif

#endif /* __PINOS_SIGNAL_H__ */