rework hook list stuff again, and replace macros with real functins. We loose type safety but things are much cleaner now

git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@1234 fefdeb5f-60dc-0310-8127-8f9354f1896f

src/pulsecore/hook-list.c

@@ -0,0 +1,111 @@
+/* $Id$ */
+
+/***
+  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.
+***/
+
+#include <pulsecore/hook-list.h>
+
+void pa_hook_init(pa_hook *hook) {
+    assert(hook);
+
+    PA_LLIST_HEAD_INIT(pa_hook_slots, hook->slots);
+    hook->last = NULL;
+    hook->n_dead = hook->firing = 0;
+}
+
+static void slot_free(pa_hook *hook, pa_hook_slot *slot) {
+    assert(hook);
+    assert(slot);
+
+    if (hook->last == slot)
+        hook->last = slot->prev;
+    
+    PA_LLIST_REMOVE(pa_hook_slot, hook->slots, slot);
+    
+    pa_xfree(slot);
+}
+
+void pa_hook_free(pa_hook *hook) {
+    assert(hook);
+    assert(!hook->firing);
+
+    while (hook->slots)
+        slot_free(hook, hook->slots);
+    
+    pa_hook_init(hook);
+}
+
+pa_hook_slot* pa_hook_connect(pa_hook *hook, pa_hook_cb_t cb, void *userdata) {
+    pa_hook_slot *slot;
+    
+    assert(cb);
+
+    slot = pa_xnew(pa_hook_slot, 1);
+    slot->hook = hook;
+    slot->dead = 0;
+    slot->callback = cb;
+    slot->userdata = userdata;
+    
+    PA_LLIST_INSERT_AFTER(pa_hook_slot, hook->slots, hook->last, slot);
+    hook->last = slot;
+    
+    return slot;
+}
+
+void pa_hook_slot_free(pa_hook_slot *slot) {
+    assert(slot);
+    assert(!slot->dead);
+    
+    if (slot->hook->firing > 0) {
+        slot->dead = 1;
+        slot->hook->n_dead++;
+    } else
+        slot_free(slot->hook, slot);
+}
+
+pa_hook_result_t pa_hook_fire(pa_hook *hook, void *data) {
+    pa_hook_slot *slot, *next;
+    pa_hook_result_t result = PA_HOOK_OK;
+    
+    assert(hook);
+
+    hook->firing ++;
+
+    for (slot = hook->slots; slot; slot = slot->next) {
+        if (slot->dead)
+            continue;
+        
+        if ((result = slot->callback(data, slot->userdata)) != PA_HOOK_OK)
+            break;
+    }
+    
+    hook->firing --;
+    
+    for (slot = hook->slots; hook->n_dead > 0 && slot; slot = next) {
+        next = slot->next;
+        
+        if (slot->dead) {
+            slot_free(hook, slot);
+            hook->n_dead--;
+        }
+    }
+
+    return result;
+}
+