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#ifndef foohooklistfoo
#define foohooklistfoo
/* $Id$ */
/***
This file is part of PulseAudio.
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
PulseAudio 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 Lesser General Public
License along with PulseAudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
/* Some macro voodoo to implement a type safe hook list */
#include <pulsecore/llist.h>
#include <pulse/xmalloc.h>
#include <pulse/cdecl.h>
typedef enum pa_hook_result {
PA_HOOK_OK = 0,
PA_HOOK_STOP = 1,
PA_HOOK_CANCEL = -1
} pa_hook_result_t;
#define PA_HOOK_DECLARE(name, arg1, arg2) \
typedef pa_hook_result_t (*pa_hook__##name##__func_t)(arg1 a, arg2 b, void *userdata); \
\
typedef struct pa_hook__##name##__func_info pa_hook__##name##__func_info; \
struct pa_hook__##name##__func_info { \
int dead; \
pa_hook__##name##__func_t func; \
void *userdata; \
PA_LLIST_FIELDS(pa_hook__##name##__func_info); \
}; \
PA_GCC_UNUSED static void pa_hook__##name##__free_one( \
pa_hook__##name##__func_info **head, \
pa_hook__##name##__func_info *i) { \
PA_LLIST_REMOVE(pa_hook__##name##__func_info, *head, i); \
pa_xfree(i); \
} \
PA_GCC_UNUSED static void pa_hook__##name##__free_all( \
pa_hook__##name##__func_info **head) { \
while (*head) \
pa_hook__##name##__free_one(head, *head); \
} \
PA_GCC_UNUSED static void pa_hook__##name##__mark_dead( \
pa_hook__##name##__func_info *i, \
pa_hook__##name##__func_t func, \
void *userdata) { \
for (; i; i = i->next) { \
if (i->func != func || i->userdata != userdata) \
continue; \
i->dead = 1; \
break; \
} \
} \
PA_GCC_UNUSED static void pa_hook__##name##__append( \
pa_hook__##name##__func_info **head, \
pa_hook__##name##__func_t func, \
void *userdata) { \
pa_hook__##name##__func_info *i = pa_xnew(pa_hook__##name##__func_info, 1); \
i->dead = 0; \
i->func = func; \
i->userdata = userdata; \
PA_LLIST_PREPEND(pa_hook__##name##__func_info, *head, i); \
} \
PA_GCC_UNUSED static pa_hook_result_t pa_hook__##name##__execute ( \
pa_hook__##name##__func_info **head, \
arg1 a, \
arg2 b) { \
pa_hook__##name##__func_info *i, *n; \
pa_hook_result_t ret = PA_HOOK_OK; \
for (i = *head; i; i = i->next) { \
if ((ret = i->func(a, b, i->userdata)) != PA_HOOK_OK) \
break; \
} \
for (i = *head; i; i = n) { \
n = i->next; \
if (i->dead) \
pa_hook__##name##__free_one(head, i); \
} \
return ret; \
}\
void pa_hook__##name##__nowarn(void)
#define PA_HOOK_HEAD(name, head) \
pa_hook__##name##__func_info *head;
#define PA_HOOK_HEAD_INIT(name, head) \
(head) = NULL
#define PA_HOOK_EXECUTE(name, head, arg1, arg2) \
pa_hook__##name##__execute(&(head), arg1, arg2)
#define PA_HOOK_APPEND(name, head, func, userdata) \
pa_hook__##name##__append(&(head), func, userdata)
#define PA_HOOK_REMOVE(name, head, func, userdata) \
pa_hook__##name##__mark_dead(head, func, userdata)
#define PA_HOOK_FREE(name, head) \
pa_hook__##name##__free_all(&(head))
#endif
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