summaryrefslogtreecommitdiffstats
path: root/src/pulsecore/hook-list.c
blob: 00981be3031d682a664965bc9a085b29e4025fd6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
/***
  This file is part of PulseAudio.

  Copyright 2006 Lennart Poettering

  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 2.1 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.
***/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <pulse/xmalloc.h>

#include <pulsecore/macro.h>

#include "hook-list.h"

void pa_hook_init(pa_hook *hook, void *data) {
    pa_assert(hook);

    PA_LLIST_HEAD_INIT(pa_hook_slot, hook->slots);
    hook->n_dead = hook->n_firing = 0;
    hook->data = data;
}

static void slot_free(pa_hook *hook, pa_hook_slot *slot) {
    pa_assert(hook);
    pa_assert(slot);

    PA_LLIST_REMOVE(pa_hook_slot, hook->slots, slot);

    pa_xfree(slot);
}

void pa_hook_done(pa_hook *hook) {
    pa_assert(hook);
    pa_assert(hook->n_firing == 0);

    while (hook->slots)
        slot_free(hook, hook->slots);

    pa_hook_init(hook, NULL);
}

pa_hook_slot* pa_hook_connect(pa_hook *hook, pa_hook_priority_t prio, pa_hook_cb_t cb, void *data) {
    pa_hook_slot *slot, *where, *prev;

    pa_assert(cb);

    slot = pa_xnew(pa_hook_slot, 1);
    slot->hook = hook;
    slot->dead = FALSE;
    slot->callback = cb;
    slot->data = data;
    slot->priority = prio;

    prev = NULL;
    for (where = hook->slots; where; where = where->next) {
        if (prio < where->priority)
            break;
        prev = where;
    }

    PA_LLIST_INSERT_AFTER(pa_hook_slot, hook->slots, prev, slot);

    return slot;
}

void pa_hook_slot_free(pa_hook_slot *slot) {
    pa_assert(slot);
    pa_assert(!slot->dead);

    if (slot->hook->n_firing > 0) {
        slot->dead = TRUE;
        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;

    pa_assert(hook);

    hook->n_firing ++;

    PA_LLIST_FOREACH(slot, hook->slots) {
        if (slot->dead)
            continue;

        if ((result = slot->callback(hook->data, data, slot->data)) != PA_HOOK_OK)
            break;
    }

    hook->n_firing --;
    pa_assert(hook->n_firing >= 0);

    for (slot = hook->slots; hook->n_dead > 0 && slot; slot = next) {
        next = slot->next;

        if (slot->dead) {
            slot_free(hook, slot);
            hook->n_dead--;
        }
    }

    pa_assert(hook->n_dead == 0);

    return result;
}

pa_bool_t pa_hook_is_firing(pa_hook *hook) {
    pa_assert(hook);

    return hook->n_firing > 0;
}