code.delx.au - pulseaudio/blob - polyp/module.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   polypaudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with polypaudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <limits.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <assert.h>
  30 #include <string.h>
  31 #include <errno.h>
  32
  33 #include "module.h"
  34 #include "xmalloc.h"
  35 #include "subscribe.h"
  36
  37 #define UNLOAD_POLL_TIME 10
  38
  39 static void timeout_callback(struct pa_mainloop_api *m, struct pa_time_event*e, const struct timeval *tv, void *userdata) {
  40     struct pa_core *c = userdata;
  41     struct timeval ntv;
  42     assert(c && c->mainloop == m && c->auto_unload_event == e);
  43
  44     pa_module_unload_unused(c);
  45
  46     gettimeofday(&ntv, NULL);
  47     ntv.tv_sec += UNLOAD_POLL_TIME;
  48     m->time_restart(e, &ntv);
  49 }
  50
  51 struct pa_module* pa_module_load(struct pa_core *c, const char *name, const char *argument) {
  52     struct pa_module *m = NULL;
  53     int r;
  54
  55     assert(c && name);
  56
  57     if (c->disallow_module_loading)
  58         goto fail;
  59
  60     m = pa_xmalloc(sizeof(struct pa_module));
  61
  62     m->name = pa_xstrdup(name);
  63     m->argument = pa_xstrdup(argument);
  64
  65     if (!(m->dl = lt_dlopenext(name)))
  66         goto fail;
  67
  68     if (!(m->init = (int (*)(struct pa_core *c, struct pa_module*m)) lt_dlsym(m->dl, "pa_module_init")))
  69         goto fail;
  70
  71     if (!(m->done = (void (*)(struct pa_core *c, struct pa_module*m)) lt_dlsym(m->dl, "pa_module_done")))
  72         goto fail;
  73
  74     m->userdata = NULL;
  75     m->core = c;
  76     m->n_used = -1;
  77     m->auto_unload = 0;
  78
  79     assert(m->init);
  80     if (m->init(c, m) < 0)
  81         goto fail;
  82
  83     if (!c->modules)
  84         c->modules = pa_idxset_new(NULL, NULL);
  85
  86     if (!c->auto_unload_event) {
  87         struct timeval ntv;
  88         gettimeofday(&ntv, NULL);
  89         ntv.tv_sec += UNLOAD_POLL_TIME;
  90         c->auto_unload_event = c->mainloop->time_new(c->mainloop, &ntv, timeout_callback, c);
  91     }
  92     assert(c->auto_unload_event);
  93
  94     assert(c->modules);
  95     r = pa_idxset_put(c->modules, m, &m->index);
  96     assert(r >= 0 && m->index != PA_IDXSET_INVALID);
  97
  98     fprintf(stderr, "module: loaded %u \"%s\" with argument \"%s\".\n", m->index, m->name, m->argument);
  99
 100     pa_subscription_post(c, PA_SUBSCRIPTION_EVENT_MODULE|PA_SUBSCRIPTION_EVENT_NEW, m->index);
 101
 102     return m;
 103
 104 fail:
 105     if (m) {
 106         pa_xfree(m->argument);
 107         pa_xfree(m->name);
 108
 109         if (m->dl)
 110             lt_dlclose(m->dl);
 111
 112         pa_xfree(m);
 113     }
 114
 115     return NULL;
 116 }
 117
 118 static void pa_module_free(struct pa_module *m) {
 119     assert(m && m->done && m->core);
 120     m->done(m->core, m);
 121
 122     lt_dlclose(m->dl);
 123
 124     fprintf(stderr, "module: unloaded %u \"%s\".\n", m->index, m->name);
 125
 126     pa_subscription_post(m->core, PA_SUBSCRIPTION_EVENT_MODULE|PA_SUBSCRIPTION_EVENT_REMOVE, m->index);
 127
 128     pa_xfree(m->name);
 129     pa_xfree(m->argument);
 130     pa_xfree(m);
 131 }
 132
 133
 134 void pa_module_unload(struct pa_core *c, struct pa_module *m) {
 135     assert(c && m);
 136
 137     assert(c->modules);
 138     if (!(m = pa_idxset_remove_by_data(c->modules, m, NULL)))
 139         return;
 140
 141     pa_module_free(m);
 142 }
 143
 144 void pa_module_unload_by_index(struct pa_core *c, uint32_t index) {
 145     struct pa_module *m;
 146     assert(c && index != PA_IDXSET_INVALID);
 147
 148     assert(c->modules);
 149     if (!(m = pa_idxset_remove_by_index(c->modules, index)))
 150         return;
 151
 152     pa_module_free(m);
 153 }
 154
 155 static void free_callback(void *p, void *userdata) {
 156     struct pa_module *m = p;
 157     assert(m);
 158     pa_module_free(m);
 159 }
 160
 161 void pa_module_unload_all(struct pa_core *c) {
 162     assert(c);
 163
 164     if (!c->modules)
 165         return;
 166
 167     pa_idxset_free(c->modules, free_callback, NULL);
 168     c->modules = NULL;
 169
 170     if (c->auto_unload_event)
 171         c->mainloop->time_free(c->auto_unload_event);
 172     c->auto_unload_event = NULL;
 173 }
 174
 175 static int unused_callback(void *p, uint32_t index, int *del, void *userdata) {
 176     struct pa_module *m = p;
 177     time_t *now = userdata;
 178     assert(p && del && now);
 179
 180     if (m->n_used == 0 && m->auto_unload && m->last_used_time+m->core->auto_unload_time <= *now) {
 181         pa_module_free(m);
 182         *del = 1;
 183     }
 184
 185     return 0;
 186 }
 187
 188 void pa_module_unload_unused(struct pa_core *c) {
 189     time_t now;
 190     assert(c);
 191
 192     if (!c->modules)
 193         return;
 194
 195     time(&now);
 196     pa_idxset_foreach(c->modules, unused_callback, &now);
 197 }
 198
 199 struct once_info {
 200     struct pa_core *core;
 201     uint32_t index;
 202 };
 203
 204 static void module_unload_once_callback(struct pa_mainloop_api *m, void *userdata) {
 205     struct once_info *i = userdata;
 206     assert(i);
 207     pa_module_unload_by_index(i->core, i->index);
 208     pa_xfree(i);
 209 }
 210
 211 void pa_module_unload_request(struct pa_core *c, struct pa_module *m) {
 212     struct once_info *i;
 213     assert(c && m);
 214
 215     i = pa_xmalloc(sizeof(struct once_info));
 216     i->core = c;
 217     i->index = m->index;
 218     pa_mainloop_api_once(c->mainloop, module_unload_once_callback, i);
 219 }
 220
 221 void pa_module_set_used(struct pa_module*m, int used) {
 222     assert(m);
 223
 224     if (m->n_used != used)
 225         pa_subscription_post(m->core, PA_SUBSCRIPTION_EVENT_MODULE|PA_SUBSCRIPTION_EVENT_CHANGE, m->index);
 226
 227     if (m->n_used != used && used == 0)
 228         time(&m->last_used_time);
 229
 230     m->n_used = used;
 231 }
 232