reall add type safe hook list

git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@1232 fefdeb5f-60dc-0310-8127-8f9354f1896f

src/pulsecore/hook-list.h

@@ -0,0 +1,117 @@
+#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