code.delx.au - pulseaudio/blob - src/polypcore/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 Lesser 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 Lesser 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 <polyp/xmalloc.h>
  34
  35 #include <polypcore/core-subscribe.h>
  36 #include <polypcore/log.h>
  37 #include <polypcore/core-util.h>
  38
  39 #include "module.h"
  40
  41 #define PA_SYMBOL_INIT "pa__init"
  42 #define PA_SYMBOL_DONE "pa__done"
  43
  44 #define UNLOAD_POLL_TIME 2
  45
  46 static void timeout_callback(pa_mainloop_api *m, pa_time_event*e, PA_GCC_UNUSED const struct timeval *tv, void *userdata) {
  47     pa_core *c = userdata;
  48     struct timeval ntv;
  49     assert(c && c->mainloop == m && c->module_auto_unload_event == e);
  50
  51     pa_module_unload_unused(c);
  52
  53     pa_gettimeofday(&ntv);
  54     ntv.tv_sec += UNLOAD_POLL_TIME;
  55     m->time_restart(e, &ntv);
  56 }
  57
  58 pa_module* pa_module_load(pa_core *c, const char *name, const char *argument) {
  59     pa_module *m = NULL;
  60     int r;
  61
  62     assert(c && name);
  63
  64     if (c->disallow_module_loading)
  65         goto fail;
  66
  67     m = pa_xmalloc(sizeof(pa_module));
  68
  69     m->name = pa_xstrdup(name);
  70     m->argument = pa_xstrdup(argument);
  71
  72     if (!(m->dl = lt_dlopenext(name))) {
  73         pa_log(__FILE__": Failed to open module \"%s\": %s", name, lt_dlerror());
  74         goto fail;
  75     }
  76
  77     if (!(m->init = (int (*)(pa_core *_c, pa_module*_m)) lt_dlsym(m->dl, PA_SYMBOL_INIT))) {
  78         pa_log(__FILE__": Failed to load module \"%s\": symbol \""PA_SYMBOL_INIT"\" not found.", name);
  79         goto fail;
  80     }
  81
  82     if (!(m->done = (void (*)(pa_core *_c, pa_module*_m)) lt_dlsym(m->dl, PA_SYMBOL_DONE))) {
  83         pa_log(__FILE__": Failed to load module \"%s\": symbol \""PA_SYMBOL_DONE"\" not found.", name);
  84         goto fail;
  85     }
  86
  87     m->userdata = NULL;
  88     m->core = c;
  89     m->n_used = -1;
  90     m->auto_unload = 0;
  91     m->unload_requested = 0;
  92
  93     assert(m->init);
  94     if (m->init(c, m) < 0) {
  95         pa_log_error(__FILE__": Failed to load  module \"%s\" (argument: \"%s\"): initialization failed.", name, argument ? argument : "");
  96         goto fail;
  97     }
  98
  99     if (!c->modules)
 100         c->modules = pa_idxset_new(NULL, NULL);
 101
 102     if (!c->module_auto_unload_event) {
 103         struct timeval ntv;
 104         pa_gettimeofday(&ntv);
 105         ntv.tv_sec += UNLOAD_POLL_TIME;
 106         c->module_auto_unload_event = c->mainloop->time_new(c->mainloop, &ntv, timeout_callback, c);
 107     }
 108     assert(c->module_auto_unload_event);
 109
 110     assert(c->modules);
 111     r = pa_idxset_put(c->modules, m, &m->index);
 112     assert(r >= 0 && m->index != PA_IDXSET_INVALID);
 113
 114     pa_log_info(__FILE__": Loaded \"%s\" (index: #%u; argument: \"%s\").", m->name, m->index, m->argument ? m->argument : "");
 115
 116     pa_subscription_post(c, PA_SUBSCRIPTION_EVENT_MODULE|PA_SUBSCRIPTION_EVENT_NEW, m->index);
 117
 118     return m;
 119
 120 fail:
 121
 122     if (m) {
 123         pa_xfree(m->argument);
 124         pa_xfree(m->name);
 125
 126         if (m->dl)
 127             lt_dlclose(m->dl);
 128
 129         pa_xfree(m);
 130     }
 131
 132     return NULL;
 133 }
 134
 135 static void pa_module_free(pa_module *m) {
 136     assert(m && m->done && m->core);
 137
 138     if (m->core->disallow_module_loading)
 139         return;
 140
 141     pa_log_info(__FILE__": Unloading \"%s\" (index: #%u).", m->name, m->index);
 142
 143     m->done(m->core, m);
 144
 145     lt_dlclose(m->dl);
 146
 147     pa_log_info(__FILE__": Unloaded \"%s\" (index: #%u).", m->name, m->index);
 148
 149     pa_subscription_post(m->core, PA_SUBSCRIPTION_EVENT_MODULE|PA_SUBSCRIPTION_EVENT_REMOVE, m->index);
 150
 151     pa_xfree(m->name);
 152     pa_xfree(m->argument);
 153     pa_xfree(m);
 154 }
 155
 156 void pa_module_unload(pa_core *c, pa_module *m) {
 157     assert(c && m);
 158
 159     assert(c->modules);
 160     if (!(m = pa_idxset_remove_by_data(c->modules, m, NULL)))
 161         return;
 162
 163     pa_module_free(m);
 164 }
 165
 166 void pa_module_unload_by_index(pa_core *c, uint32_t idx) {
 167     pa_module *m;
 168     assert(c && idx != PA_IDXSET_INVALID);
 169
 170     assert(c->modules);
 171     if (!(m = pa_idxset_remove_by_index(c->modules, idx)))
 172         return;
 173
 174     pa_module_free(m);
 175 }
 176
 177 static void free_callback(void *p, PA_GCC_UNUSED void *userdata) {
 178     pa_module *m = p;
 179     assert(m);
 180     pa_module_free(m);
 181 }
 182
 183 void pa_module_unload_all(pa_core *c) {
 184     assert(c);
 185
 186     if (!c->modules)
 187         return;
 188
 189     pa_idxset_free(c->modules, free_callback, NULL);
 190     c->modules = NULL;
 191
 192     if (c->module_auto_unload_event) {
 193         c->mainloop->time_free(c->module_auto_unload_event);
 194         c->module_auto_unload_event = NULL;
 195     }
 196
 197     if (c->module_defer_unload_event) {
 198         c->mainloop->defer_free(c->module_defer_unload_event);
 199         c->module_defer_unload_event = NULL;
 200     }
 201 }
 202
 203 static int unused_callback(void *p, PA_GCC_UNUSED uint32_t idx, int *del, void *userdata) {
 204     pa_module *m = p;
 205     time_t *now = userdata;
 206     assert(p && del && now);
 207
 208     if (m->n_used == 0 && m->auto_unload && m->last_used_time+m->core->module_idle_time <= *now) {
 209         pa_module_free(m);
 210         *del = 1;
 211     }
 212
 213     return 0;
 214 }
 215
 216 void pa_module_unload_unused(pa_core *c) {
 217     time_t now;
 218     assert(c);
 219
 220     if (!c->modules)
 221         return;
 222
 223     time(&now);
 224     pa_idxset_foreach(c->modules, unused_callback, &now);
 225 }
 226
 227 static int unload_callback(void *p, PA_GCC_UNUSED uint32_t idx, int *del, PA_GCC_UNUSED void *userdata) {
 228     pa_module *m = p;
 229     assert(m);
 230
 231     if (m->unload_requested) {
 232         pa_module_free(m);
 233         *del = 1;
 234     }
 235
 236     return 0;
 237 }
 238
 239 static void defer_cb(pa_mainloop_api*api, pa_defer_event *e, void *userdata) {
 240     pa_core *core = userdata;
 241     api->defer_enable(e, 0);
 242
 243     if (!core->modules)
 244         return;
 245
 246     pa_idxset_foreach(core->modules, unload_callback, NULL);
 247
 248 }
 249
 250 void pa_module_unload_request(pa_module *m) {
 251     assert(m);
 252
 253     m->unload_requested = 1;
 254
 255     if (!m->core->module_defer_unload_event)
 256         m->core->module_defer_unload_event = m->core->mainloop->defer_new(m->core->mainloop, defer_cb, m->core);
 257
 258     m->core->mainloop->defer_enable(m->core->module_defer_unload_event, 1);
 259 }
 260
 261 void pa_module_set_used(pa_module*m, int used) {
 262     assert(m);
 263
 264     if (m->n_used != used)
 265         pa_subscription_post(m->core, PA_SUBSCRIPTION_EVENT_MODULE|PA_SUBSCRIPTION_EVENT_CHANGE, m->index);
 266
 267     if (m->n_used != used && used == 0)
 268         time(&m->last_used_time);
 269
 270     m->n_used = used;
 271 }
 272
 273 pa_modinfo *pa_module_get_info(pa_module *m) {
 274     assert(m);
 275
 276     return pa_modinfo_get_by_handle(m->dl);
 277 }