1 files changed, 275 insertions, 0 deletions
diff --git a/src/polypcore/module.c b/src/polypcore/module.c
new file mode 100644
index 00000000..499ea299
--- /dev/null
+++ b/src/polypcore/module.c
@@ -0,0 +1,275 @@
+/* $Id$ */
+
+/***
+  This file is part of polypaudio.
+ 
+  polypaudio 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 of the License,
+  or (at your option) any later version.
+ 
+  polypaudio 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 polypaudio; 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 <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <string.h>
+#include <errno.h>
+
+#include "module.h"
+#include "xmalloc.h"
+#include "subscribe.h"
+#include "log.h"
+#include "util.h"
+
+#define PA_SYMBOL_INIT "pa__init"
+#define PA_SYMBOL_DONE "pa__done"
+
+#define UNLOAD_POLL_TIME 2
+
+static void timeout_callback(pa_mainloop_api *m, pa_time_event*e, PA_GCC_UNUSED const struct timeval *tv, void *userdata) {
+    pa_core *c = userdata;
+    struct timeval ntv;
+    assert(c && c->mainloop == m && c->module_auto_unload_event == e);
+
+    pa_module_unload_unused(c);
+
+    pa_gettimeofday(&ntv);
+    ntv.tv_sec += UNLOAD_POLL_TIME;
+    m->time_restart(e, &ntv);
+}
+
+pa_module* pa_module_load(pa_core *c, const char *name, const char *argument) {
+    pa_module *m = NULL;
+    int r;
+    
+    assert(c && name);
+
+    if (c->disallow_module_loading)
+        goto fail;
+    
+    m = pa_xmalloc(sizeof(pa_module));
+
+    m->name = pa_xstrdup(name);
+    m->argument = pa_xstrdup(argument);
+    
+    if (!(m->dl = lt_dlopenext(name))) {
+        pa_log(__FILE__": Failed to open module \"%s\": %s\n", name, lt_dlerror());
+        goto fail;
+    }
+
+    if (!(m->init = (int (*)(pa_core *_c, pa_module*_m)) lt_dlsym(m->dl, PA_SYMBOL_INIT))) {
+        pa_log(__FILE__": Failed to load module \"%s\": symbol \""PA_SYMBOL_INIT"\" not found.\n", name);
+        goto fail;
+    }
+
+    if (!(m->done = (void (*)(pa_core *_c, pa_module*_m)) lt_dlsym(m->dl, PA_SYMBOL_DONE))) {
+        pa_log(__FILE__": Failed to load module \"%s\": symbol \""PA_SYMBOL_DONE"\" not found.\n", name);
+        goto fail;
+    }
+    
+    m->userdata = NULL;
+    m->core = c;
+    m->n_used = -1;
+    m->auto_unload = 0;
+    m->unload_requested = 0;
+
+    assert(m->init);
+    if (m->init(c, m) < 0) {
+        pa_log_error(__FILE__": Failed to load  module \"%s\" (argument: \"%s\"): initialization failed.\n", name, argument ? argument : "");
+        goto fail;
+    }
+
+    if (!c->modules)
+        c->modules = pa_idxset_new(NULL, NULL);
+
+    if (!c->module_auto_unload_event) {
+        struct timeval ntv;
+        pa_gettimeofday(&ntv);
+        ntv.tv_sec += UNLOAD_POLL_TIME;
+        c->module_auto_unload_event = c->mainloop->time_new(c->mainloop, &ntv, timeout_callback, c);
+    }
+    assert(c->module_auto_unload_event);
+    
+    assert(c->modules);
+    r = pa_idxset_put(c->modules, m, &m->index);
+    assert(r >= 0 && m->index != PA_IDXSET_INVALID);
+
+    pa_log_info(__FILE__": Loaded \"%s\" (index: #%u; argument: \"%s\").\n", m->name, m->index, m->argument ? m->argument : ""); 
+
+    pa_subscription_post(c, PA_SUBSCRIPTION_EVENT_MODULE|PA_SUBSCRIPTION_EVENT_NEW, m->index);
+    
+    return m;
+    
+fail:
+
+    if (m) {
+        pa_xfree(m->argument);
+        pa_xfree(m->name);
+        
+        if (m->dl)
+            lt_dlclose(m->dl);
+
+        pa_xfree(m);
+    }
+
+    return NULL;
+}
+
+static void pa_module_free(pa_module *m) {
+    assert(m && m->done && m->core);
+
+    if (m->core->disallow_module_loading)
+        return;
+
+    pa_log_info(__FILE__": Unloading \"%s\" (index: #%u).\n", m->name, m->index); 
+
+    m->done(m->core, m);
+
+    lt_dlclose(m->dl);
+    
+    pa_log_info(__FILE__": Unloaded \"%s\" (index: #%u).\n", m->name, m->index); 
+
+    pa_subscription_post(m->core, PA_SUBSCRIPTION_EVENT_MODULE|PA_SUBSCRIPTION_EVENT_REMOVE, m->index);
+    
+    pa_xfree(m->name);
+    pa_xfree(m->argument);
+    pa_xfree(m);
+}
+
+void pa_module_unload(pa_core *c, pa_module *m) {
+    assert(c && m);
+
+    assert(c->modules);
+    if (!(m = pa_idxset_remove_by_data(c->modules, m, NULL)))
+        return;
+
+    pa_module_free(m);
+}
+
+void pa_module_unload_by_index(pa_core *c, uint32_t idx) {
+    pa_module *m;
+    assert(c && idx != PA_IDXSET_INVALID);
+
+    assert(c->modules);
+    if (!(m = pa_idxset_remove_by_index(c->modules, idx)))
+        return;
+
+    pa_module_free(m);
+}
+
+static void free_callback(void *p, PA_GCC_UNUSED void *userdata) {
+    pa_module *m = p;
+    assert(m);
+    pa_module_free(m);
+}
+
+void pa_module_unload_all(pa_core *c) {
+    assert(c);
+
+    if (!c->modules)
+        return;
+
+    pa_idxset_free(c->modules, free_callback, NULL);
+    c->modules = NULL;
+
+    if (c->module_auto_unload_event) {
+        c->mainloop->time_free(c->module_auto_unload_event);
+        c->module_auto_unload_event = NULL;
+    }
+
+    if (c->module_defer_unload_event) {
+        c->mainloop->defer_free(c->module_defer_unload_event);
+        c->module_defer_unload_event = NULL;
+    }
+}
+
+static int unused_callback(void *p, PA_GCC_UNUSED uint32_t idx, int *del, void *userdata) {
+    pa_module *m = p;
+    time_t *now = userdata;
+    assert(p && del && now);
+    
+    if (m->n_used == 0 && m->auto_unload && m->last_used_time+m->core->module_idle_time <= *now) {
+        pa_module_free(m);
+        *del = 1;
+    }
+
+    return 0;
+}
+
+void pa_module_unload_unused(pa_core *c) {
+    time_t now;
+    assert(c);
+
+    if (!c->modules)
+        return;
+    
+    time(&now);
+    pa_idxset_foreach(c->modules, unused_callback, &now);
+}
+
+static int unload_callback(void *p, PA_GCC_UNUSED uint32_t idx, int *del, PA_GCC_UNUSED void *userdata) {
+    pa_module *m = p;
+    assert(m);
+
+    if (m->unload_requested) {
+        pa_module_free(m);
+        *del = 1;
+    }
+
+    return 0;
+}
+
+static void defer_cb(pa_mainloop_api*api, pa_defer_event *e, void *userdata) {
+    pa_core *core = userdata;
+    api->defer_enable(e, 0);
+
+    if (!core->modules)
+        return;
+
+    pa_idxset_foreach(core->modules, unload_callback, NULL);
+
+}
+
+void pa_module_unload_request(pa_module *m) {
+    assert(m);
+
+    m->unload_requested = 1;
+
+    if (!m->core->module_defer_unload_event)
+        m->core->module_defer_unload_event = m->core->mainloop->defer_new(m->core->mainloop, defer_cb, m->core);
+
+    m->core->mainloop->defer_enable(m->core->module_defer_unload_event, 1);
+}
+
+void pa_module_set_used(pa_module*m, int used) {
+    assert(m);
+
+    if (m->n_used != used)
+        pa_subscription_post(m->core, PA_SUBSCRIPTION_EVENT_MODULE|PA_SUBSCRIPTION_EVENT_CHANGE, m->index);
+    
+    if (m->n_used != used && used == 0)
+        time(&m->last_used_time);
+
+    m->n_used = used;
+}
+
+pa_modinfo *pa_module_get_info(pa_module *m) {
+    assert(m);
+
+    return pa_modinfo_get_by_handle(m->dl);
+}