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
  36 #define UNLOAD_POLL_TIME 10
  37
  38 static void timeout_callback(struct pa_mainloop_api *m, void *id, const struct timeval *tv, void *userdata) {
  39     struct pa_core *c = userdata;
  40     struct timeval ntv;
  41     assert(c && c->mainloop == m && c->auto_unload_mainloop_source == id);
  42
  43     pa_module_unload_unused(c);
  44
  45     gettimeofday(&ntv, NULL);
  46     ntv.tv_sec += UNLOAD_POLL_TIME;
  47     m->enable_time(m, id, &ntv);
  48 }
  49
  50 struct pa_module* pa_module_load(struct pa_core *c, const char *name, const char *argument) {
  51     struct pa_module *m = NULL;
  52     int r;
  53
  54     assert(c && name);
  55
  56     m = pa_xmalloc(sizeof(struct pa_module));
  57
  58     m->name = pa_xstrdup(name);
  59     m->argument = pa_xstrdup(argument);
  60
  61     if (!(m->dl = lt_dlopenext(name)))
  62         goto fail;
  63
  64     if (!(m->init = lt_dlsym(m->dl, "pa_module_init")))
  65         goto fail;
  66
  67     if (!(m->done = lt_dlsym(m->dl, "pa_module_done")))
  68         goto fail;
  69
  70     m->userdata = NULL;
  71     m->core = c;
  72     m->n_used = -1;
  73     m->auto_unload = 0;
  74
  75     assert(m->init);
  76     if (m->init(c, m) < 0)
  77         goto fail;
  78
  79     if (!c->modules)
  80         c->modules = pa_idxset_new(NULL, NULL);
  81
  82     if (!c->auto_unload_mainloop_source) {
  83         struct timeval ntv;
  84         gettimeofday(&ntv, NULL);
  85         ntv.tv_sec += UNLOAD_POLL_TIME;
  86         c->auto_unload_mainloop_source = c->mainloop->source_time(c->mainloop, &ntv, timeout_callback, c);
  87     }
  88     assert(c->auto_unload_mainloop_source);
  89
  90     assert(c->modules);
  91     r = pa_idxset_put(c->modules, m, &m->index);
  92     assert(r >= 0 && m->index != PA_IDXSET_INVALID);
  93
  94     fprintf(stderr, "module: loaded %u \"%s\" with argument \"%s\".\n", m->index, m->name, m->argument);
  95
  96     return m;
  97
  98 fail:
  99     if (m) {
 100         pa_xfree(m->argument);
 101         pa_xfree(m->name);
 102
 103         if (m->dl)
 104             lt_dlclose(m->dl);
 105
 106         pa_xfree(m);
 107     }
 108
 109     return NULL;
 110 }
 111
 112 static void pa_module_free(struct pa_module *m) {
 113     assert(m && m->done && m->core);
 114     m->done(m->core, m);
 115
 116     lt_dlclose(m->dl);
 117
 118     fprintf(stderr, "module: unloaded %u \"%s\".\n", m->index, m->name);
 119
 120     pa_xfree(m->name);
 121     pa_xfree(m->argument);
 122     pa_xfree(m);
 123 }
 124
 125
 126 void pa_module_unload(struct pa_core *c, struct pa_module *m) {
 127     assert(c && m);
 128
 129     assert(c->modules);
 130     if (!(m = pa_idxset_remove_by_data(c->modules, m, NULL)))
 131         return;
 132
 133     pa_module_free(m);
 134 }
 135
 136 void pa_module_unload_by_index(struct pa_core *c, uint32_t index) {
 137     struct pa_module *m;
 138     assert(c && index != PA_IDXSET_INVALID);
 139
 140     assert(c->modules);
 141     if (!(m = pa_idxset_remove_by_index(c->modules, index)))
 142         return;
 143
 144     pa_module_free(m);
 145 }
 146
 147 static void free_callback(void *p, void *userdata) {
 148     struct pa_module *m = p;
 149     assert(m);
 150     pa_module_free(m);
 151 }
 152
 153 void pa_module_unload_all(struct pa_core *c) {
 154     assert(c);
 155
 156     if (!c->modules)
 157         return;
 158
 159     pa_idxset_free(c->modules, free_callback, NULL);
 160     c->modules = NULL;
 161
 162     if (c->auto_unload_mainloop_source)
 163         c->mainloop->cancel_time(c->mainloop, c->auto_unload_mainloop_source);
 164     c->auto_unload_mainloop_source = NULL;
 165 }
 166
 167 static int unused_callback(void *p, uint32_t index, int *del, void *userdata) {
 168     struct pa_module *m = p;
 169     time_t *now = userdata;
 170     assert(p && del && now);
 171
 172     if (m->n_used == 0 && m->auto_unload && m->last_used_time+m->core->auto_unload_time <= *now) {
 173         pa_module_free(m);
 174         *del = 1;
 175     }
 176
 177     return 0;
 178 }
 179
 180 void pa_module_unload_unused(struct pa_core *c) {
 181     time_t now;
 182     assert(c);
 183
 184     if (!c->modules)
 185         return;
 186
 187     time(&now);
 188     pa_idxset_foreach(c->modules, unused_callback, &now);
 189 }
 190
 191 struct once_info {
 192     struct pa_core *core;
 193     uint32_t index;
 194 };
 195
 196 static void module_unload_once_callback(void *userdata) {
 197     struct once_info *i = userdata;
 198     assert(i);
 199     pa_module_unload_by_index(i->core, i->index);
 200     pa_xfree(i);
 201 }
 202
 203 void pa_module_unload_request(struct pa_core *c, struct pa_module *m) {
 204     struct once_info *i;
 205     assert(c && m);
 206
 207     i = pa_xmalloc(sizeof(struct once_info));
 208     i->core = c;
 209     i->index = m->index;
 210     pa_mainloop_api_once(c->mainloop, module_unload_once_callback, i);
 211 }
 212
 213 void pa_module_set_used(struct pa_module*m, int used) {
 214     assert(m);
 215
 216     if (m->n_used != used && used == 0)
 217         time(&m->last_used_time);
 218
 219     m->n_used = used;
 220 }
 221