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     m = pa_xmalloc(sizeof(struct pa_module));
  58
  59     m->name = pa_xstrdup(name);
  60     m->argument = pa_xstrdup(argument);
  61
  62     if (!(m->dl = lt_dlopenext(name)))
  63         goto fail;
  64
  65     if (!(m->init = lt_dlsym(m->dl, "pa_module_init")))
  66         goto fail;
  67
  68     if (!(m->done = lt_dlsym(m->dl, "pa_module_done")))
  69         goto fail;
  70
  71     m->userdata = NULL;
  72     m->core = c;
  73     m->n_used = -1;
  74     m->auto_unload = 0;
  75
  76     assert(m->init);
  77     if (m->init(c, m) < 0)
  78         goto fail;
  79
  80     if (!c->modules)
  81         c->modules = pa_idxset_new(NULL, NULL);
  82
  83     if (!c->auto_unload_event) {
  84         struct timeval ntv;
  85         gettimeofday(&ntv, NULL);
  86         ntv.tv_sec += UNLOAD_POLL_TIME;
  87         c->auto_unload_event = c->mainloop->time_new(c->mainloop, &ntv, timeout_callback, c);
  88     }
  89     assert(c->auto_unload_event);
  90
  91     assert(c->modules);
  92     r = pa_idxset_put(c->modules, m, &m->index);
  93     assert(r >= 0 && m->index != PA_IDXSET_INVALID);
  94
  95     fprintf(stderr, "module: loaded %u \"%s\" with argument \"%s\".\n", m->index, m->name, m->argument);
  96
  97     pa_subscription_post(c, PA_SUBSCRIPTION_EVENT_MODULE|PA_SUBSCRIPTION_EVENT_NEW, m->index);
  98
  99     return m;
 100
 101 fail:
 102     if (m) {
 103         pa_xfree(m->argument);
 104         pa_xfree(m->name);
 105
 106         if (m->dl)
 107             lt_dlclose(m->dl);
 108
 109         pa_xfree(m);
 110     }
 111
 112     return NULL;
 113 }
 114
 115 static void pa_module_free(struct pa_module *m) {
 116     assert(m && m->done && m->core);
 117     m->done(m->core, m);
 118
 119     lt_dlclose(m->dl);
 120
 121     fprintf(stderr, "module: unloaded %u \"%s\".\n", m->index, m->name);
 122
 123     pa_subscription_post(m->core, PA_SUBSCRIPTION_EVENT_MODULE|PA_SUBSCRIPTION_EVENT_REMOVE, m->index);
 124
 125     pa_xfree(m->name);
 126     pa_xfree(m->argument);
 127     pa_xfree(m);
 128 }
 129
 130
 131 void pa_module_unload(struct pa_core *c, struct pa_module *m) {
 132     assert(c && m);
 133
 134     assert(c->modules);
 135     if (!(m = pa_idxset_remove_by_data(c->modules, m, NULL)))
 136         return;
 137
 138     pa_module_free(m);
 139 }
 140
 141 void pa_module_unload_by_index(struct pa_core *c, uint32_t index) {
 142     struct pa_module *m;
 143     assert(c && index != PA_IDXSET_INVALID);
 144
 145     assert(c->modules);
 146     if (!(m = pa_idxset_remove_by_index(c->modules, index)))
 147         return;
 148
 149     pa_module_free(m);
 150 }
 151
 152 static void free_callback(void *p, void *userdata) {
 153     struct pa_module *m = p;
 154     assert(m);
 155     pa_module_free(m);
 156 }
 157
 158 void pa_module_unload_all(struct pa_core *c) {
 159     assert(c);
 160
 161     if (!c->modules)
 162         return;
 163
 164     pa_idxset_free(c->modules, free_callback, NULL);
 165     c->modules = NULL;
 166
 167     if (c->auto_unload_event)
 168         c->mainloop->time_free(c->auto_unload_event);
 169     c->auto_unload_event = NULL;
 170 }
 171
 172 static int unused_callback(void *p, uint32_t index, int *del, void *userdata) {
 173     struct pa_module *m = p;
 174     time_t *now = userdata;
 175     assert(p && del && now);
 176
 177     if (m->n_used == 0 && m->auto_unload && m->last_used_time+m->core->auto_unload_time <= *now) {
 178         pa_module_free(m);
 179         *del = 1;
 180     }
 181
 182     return 0;
 183 }
 184
 185 void pa_module_unload_unused(struct pa_core *c) {
 186     time_t now;
 187     assert(c);
 188
 189     if (!c->modules)
 190         return;
 191
 192     time(&now);
 193     pa_idxset_foreach(c->modules, unused_callback, &now);
 194 }
 195
 196 struct once_info {
 197     struct pa_core *core;
 198     uint32_t index;
 199 };
 200
 201 static void module_unload_once_callback(struct pa_mainloop_api *m, void *userdata) {
 202     struct once_info *i = userdata;
 203     assert(i);
 204     pa_module_unload_by_index(i->core, i->index);
 205     pa_xfree(i);
 206 }
 207
 208 void pa_module_unload_request(struct pa_core *c, struct pa_module *m) {
 209     struct once_info *i;
 210     assert(c && m);
 211
 212     i = pa_xmalloc(sizeof(struct once_info));
 213     i->core = c;
 214     i->index = m->index;
 215     pa_mainloop_api_once(c->mainloop, module_unload_once_callback, i);
 216 }
 217
 218 void pa_module_set_used(struct pa_module*m, int used) {
 219     assert(m);
 220
 221     if (m->n_used != used)
 222         pa_subscription_post(m->core, PA_SUBSCRIPTION_EVENT_MODULE|PA_SUBSCRIPTION_EVENT_CHANGE, m->index);
 223
 224     if (m->n_used != used && used == 0)
 225         time(&m->last_used_time);
 226
 227     m->n_used = used;
 228 }
 229