C++ pa_xnew函数代码示例

pa_mempool* pa_mempool_new(int shared) {
    pa_mempool *p;

    p = pa_xnew(pa_mempool, 1);

    p->mutex = pa_mutex_new(TRUE, TRUE);
    p->semaphore = pa_semaphore_new(0);

    p->block_size = PA_PAGE_ALIGN(PA_MEMPOOL_SLOT_SIZE);
    if (p->block_size < PA_PAGE_SIZE)
        p->block_size = PA_PAGE_SIZE;

    p->n_blocks = PA_MEMPOOL_SLOTS_MAX;

    pa_assert(p->block_size > PA_ALIGN(sizeof(struct mempool_slot)));

    if (pa_shm_create_rw(&p->memory, p->n_blocks * p->block_size, shared, 0700) < 0) {
        pa_xfree(p);
        return NULL;
    }

    memset(&p->stat, 0, sizeof(p->stat));
    pa_atomic_store(&p->n_init, 0);

    PA_LLIST_HEAD_INIT(pa_memimport, p->imports);
    PA_LLIST_HEAD_INIT(pa_memexport, p->exports);

    p->free_slots = pa_flist_new(p->n_blocks*2);

    return p;
}

pa_dbusobj_server_lookup *pa_dbusobj_server_lookup_new(pa_core *c) {
    pa_dbusobj_server_lookup *sl;
    DBusError error;

    dbus_error_init(&error);

    sl = pa_xnew(pa_dbusobj_server_lookup, 1);
    sl->core = c;
    sl->path_registered = false;

    if (!(sl->conn = pa_dbus_bus_get(c, DBUS_BUS_SESSION, &error)) || dbus_error_is_set(&error)) {
        pa_log_warn("Unable to contact D-Bus: %s: %s", error.name, error.message);
        goto fail;
    }

    if (!dbus_connection_register_object_path(pa_dbus_connection_get(sl->conn), OBJECT_PATH, &vtable, sl)) {
        pa_log("dbus_connection_register_object_path() failed for " OBJECT_PATH ".");
        goto fail;
    }

    sl->path_registered = true;

    return sl;

fail:
    dbus_error_free(&error);

    pa_dbusobj_server_lookup_free(sl);

    return NULL;
}

static pa_autoload_entry* entry_new(pa_core *c, const char *name) {
    pa_autoload_entry *e = NULL;

    pa_core_assert_ref(c);
    pa_assert(name);

    if (c->autoload_hashmap && (e = pa_hashmap_get(c->autoload_hashmap, name)))
        return NULL;

    e = pa_xnew(pa_autoload_entry, 1);
    e->core = c;
    e->name = pa_xstrdup(name);
    e->module = e->argument = NULL;
    e->in_action = 0;

    if (!c->autoload_hashmap)
        c->autoload_hashmap = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
    pa_assert(c->autoload_hashmap);

    pa_hashmap_put(c->autoload_hashmap, e->name, e);

    if (!c->autoload_idxset)
        c->autoload_idxset = pa_idxset_new(pa_idxset_trivial_hash_func, pa_idxset_trivial_compare_func);
    pa_idxset_put(c->autoload_idxset, e, &e->index);

    pa_subscription_post(c, PA_SUBSCRIPTION_EVENT_AUTOLOAD|PA_SUBSCRIPTION_EVENT_NEW, e->index);

    return e;
}

pa_smoother* pa_smoother_new(
        uint64_t adjust_time,
        uint64_t history_time,
        bool monotonic,
        bool smoothing,
        unsigned min_history,
        uint64_t time_offset,
        bool paused) {

    pa_smoother *s;

    pa_assert(adjust_time > 0);
    pa_assert(history_time > 0);
    pa_assert(min_history >= 2);
    pa_assert(min_history <= HISTORY_MAX);

    s = pa_xnew(pa_smoother, 1);
    s->adjust_time = adjust_time;
    s->history_time = history_time;
    s->min_history = min_history;
    s->monotonic = monotonic;
    s->smoothing = smoothing;

    pa_smoother_reset(s, time_offset, paused);

    return s;
}

static pa_defer_event* glib_defer_new(
        pa_mainloop_api*m,
        pa_defer_event_cb_t cb,
        void *userdata) {

    pa_defer_event *e;
    pa_glib_mainloop *g;

    g_assert(m);
    g_assert(m->userdata);
    g_assert(cb);

    g = m->userdata;

    e = pa_xnew(pa_defer_event, 1);
    e->mainloop = g;
    e->dead = 0;

    e->enabled = 1;
    g->n_enabled_defer_events++;

    e->callback = cb;
    e->userdata = userdata;
    e->destroy_callback = NULL;

    PA_LLIST_PREPEND(pa_defer_event, g->defer_events, e);
    return e;
}

pa_fdsem *pa_fdsem_new_shm(pa_fdsem_data *data, int* event_fd) {
    pa_fdsem *f = NULL;

    pa_assert(data);
    pa_assert(event_fd);

#ifdef HAVE_SYS_EVENTFD_H

    f = pa_xnew(pa_fdsem, 1);

    if ((f->efd = eventfd(0, EFD_CLOEXEC)) < 0) {
        pa_xfree(f);
        return NULL;
    }

    f->fds[0] = f->fds[1] = -1;
    f->data = data;

    pa_atomic_store(&f->data->waiting, 0);
    pa_atomic_store(&f->data->signalled, 0);
    pa_atomic_store(&f->data->in_pipe, 0);

#endif

    return f;
}

pa_cond *pa_cond_new(void) {
    pa_cond *c;

    c = pa_xnew(pa_cond, 1);
    pa_assert_se(pthread_cond_init(&c->cond, NULL) == 0);
    return c;
}

pa_dbus_wrap_connection* pa_dbus_wrap_connection_new(pa_mainloop_api *m, pa_bool_t use_rtclock, DBusBusType type, DBusError *error) {
    DBusConnection *conn;
    pa_dbus_wrap_connection *pconn;
    char *id;

    pa_assert(type == DBUS_BUS_SYSTEM || type == DBUS_BUS_SESSION || type == DBUS_BUS_STARTER);

    if (!(conn = dbus_bus_get_private(type, error)))
        return NULL;

    pconn = pa_xnew(pa_dbus_wrap_connection, 1);
    pconn->mainloop = m;
    pconn->connection = conn;
    pconn->use_rtclock = use_rtclock;

    dbus_connection_set_exit_on_disconnect(conn, FALSE);
    dbus_connection_set_dispatch_status_function(conn, dispatch_status, pconn, NULL);
    dbus_connection_set_watch_functions(conn, add_watch, remove_watch, toggle_watch, pconn, NULL);
    dbus_connection_set_timeout_functions(conn, add_timeout, remove_timeout, toggle_timeout, pconn, NULL);
    dbus_connection_set_wakeup_main_function(conn, wakeup_main, pconn, NULL);

    pconn->dispatch_event = pconn->mainloop->defer_new(pconn->mainloop, dispatch_cb, conn);

    pa_log_debug("Successfully connected to D-Bus %s bus %s as %s",
                 type == DBUS_BUS_SYSTEM ? "system" : (type == DBUS_BUS_SESSION ? "session" : "starter"),
                 pa_strnull((id = dbus_connection_get_server_id(conn))),
                 pa_strnull(dbus_bus_get_unique_name(conn)));

    dbus_free(id);

    return pconn;
}

pa_mutex* pa_mutex_new(pa_bool_t recursive, pa_bool_t inherit_priority) {
    pa_mutex *m;
    pthread_mutexattr_t attr;
    int r;

    pa_assert_se(pthread_mutexattr_init(&attr) == 0);

    if (recursive)
        pa_assert_se(pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) == 0);

#ifdef HAVE_PTHREAD_PRIO_INHERIT
    if (inherit_priority)
        pa_assert_se(pthread_mutexattr_setprotocol(&attr, PTHREAD_PRIO_INHERIT) == 0);
#endif

    m = pa_xnew(pa_mutex, 1);

#ifndef HAVE_PTHREAD_PRIO_INHERIT
    pa_assert_se(pthread_mutex_init(&m->mutex, &attr) == 0);

#else
    if ((r = pthread_mutex_init(&m->mutex, &attr))) {

        /* If this failed, then this was probably due to non-available
         * priority inheritance. In which case we fall back to normal
         * mutexes. */
        pa_assert(r == ENOTSUP && inherit_priority);

        pa_assert_se(pthread_mutexattr_setprotocol(&attr, PTHREAD_PRIO_NONE) == 0);
        pa_assert_se(pthread_mutex_init(&m->mutex, &attr) == 0);
    }
#endif

    return m;
}

/* No lock necessary */
pa_memblock *pa_memblock_new_user(pa_mempool *p, void *d, size_t length, pa_free_cb_t free_cb, bool read_only) {
    pa_memblock *b;

    pa_assert(p);
    pa_assert(d);
    pa_assert(length);
    pa_assert(length != (size_t) -1);
    pa_assert(free_cb);

    if (!(b = pa_flist_pop(PA_STATIC_FLIST_GET(unused_memblocks))))
        b = pa_xnew(pa_memblock, 1);

    PA_REFCNT_INIT(b);
    b->pool = p;
    b->type = PA_MEMBLOCK_USER;
    b->read_only = read_only;
    b->is_silence = false;
    pa_atomic_ptr_store(&b->data, d);
    b->length = length;
    pa_atomic_store(&b->n_acquired, 0);
    pa_atomic_store(&b->please_signal, 0);

    b->per_type.user.free_cb = free_cb;

    stat_add(b);
    return b;
}

pa_smoother* pa_smoother_new(pa_usec_t adjust_time, pa_usec_t history_time, pa_bool_t monotonic) {
    pa_smoother *s;

    pa_assert(adjust_time > 0);
    pa_assert(history_time > 0);

    s = pa_xnew(pa_smoother, 1);
    s->adjust_time = adjust_time;
    s->history_time = history_time;
    s->time_offset = 0;
    s->monotonic = monotonic;

    s->px = s->py = 0;
    s->dp = 1;

    s->ex = s->ey = 0;
    s->de = 1;

    s->history_idx = 0;
    s->n_history = 0;

    s->last_y = 0;

    s->abc_valid = FALSE;

    s->paused = FALSE;

    return s;
}

pa_shmasyncq *pa_shmasyncq_new(unsigned n_elements, size_t element_size, void *data, int fd[2]) {
    pa_shmasyncq *l;

    pa_assert(n_elements > 0);
    pa_assert(is_power_of_two(n_elements));
    pa_assert(element_size > 0);
    pa_assert(data);
    pa_assert(fd);

    l = pa_xnew(pa_shmasyncq, 1);

    l->data = data;
    memset(data, 0, PA_SHMASYNCQ_SIZE(n_elements, element_size));

    l->data->n_elements = n_elements;
    l->data->element_size = element_size;

    if (!(l->read_fdsem = pa_fdsem_new_shm(&d->read_fdsem_data))) {
        pa_xfree(l);
        return NULL;
    }
    fd[0] = pa_fdsem_get(l->read_fdsem);

    if (!(l->write_fdsem = pa_fdsem_new(&d->write_fdsem_data, &fd[1]))) {
        pa_fdsem_free(l->read_fdsem);
        pa_xfree(l);
        return NULL;
    }

    return l;
}

static pa_x11_wrapper* x11_wrapper_new(pa_core *c, const char *name, const char *t) {
    pa_x11_wrapper*w;
    Display *d;

    if (!(d = XOpenDisplay(name))) {
        pa_log("XOpenDisplay() failed");
        return NULL;
    }

    w = pa_xnew(pa_x11_wrapper, 1);
    PA_REFCNT_INIT(w);
    w->core = c;
    w->property_name = pa_xstrdup(t);
    w->display = d;

    PA_LLIST_HEAD_INIT(pa_x11_client, w->clients);
    PA_LLIST_HEAD_INIT(pa_x11_internal, w->internals);

    w->defer_event = c->mainloop->defer_new(c->mainloop, defer_event, w);
    w->io_event = c->mainloop->io_new(c->mainloop, ConnectionNumber(d), PA_IO_EVENT_INPUT, display_io_event, w);

    XAddConnectionWatch(d, x11_watch, (XPointer) w);

    pa_assert_se(pa_shared_set(c, w->property_name, w) >= 0);

    return w;
}

pa_client *pa_client_new(pa_core *core, pa_client_new_data *data) {
    pa_client *c;

    pa_core_assert_ref(core);
    pa_assert(data);

    if (pa_hook_fire(&core->hooks[PA_CORE_HOOK_CLIENT_NEW], data) < 0)
        return NULL;

    c = pa_xnew(pa_client, 1);
    c->core = core;
    c->proplist = pa_proplist_copy(data->proplist);
    c->driver = pa_xstrdup(pa_path_get_filename(data->driver));
    c->module = data->module;

    c->sink_inputs = pa_idxset_new(NULL, NULL);
    c->source_outputs = pa_idxset_new(NULL, NULL);

    c->userdata = NULL;
    c->kill = NULL;
    c->send_event = NULL;

    pa_assert_se(pa_idxset_put(core->clients, c, &c->index) >= 0);

    pa_log_info("Created %u \"%s\"", c->index, pa_strnull(pa_proplist_gets(c->proplist, PA_PROP_APPLICATION_NAME)));
    pa_subscription_post(core, PA_SUBSCRIPTION_EVENT_CLIENT|PA_SUBSCRIPTION_EVENT_NEW, c->index);

    pa_hook_fire(&core->hooks[PA_CORE_HOOK_CLIENT_PUT], c);

    pa_core_check_idle(core);

    return c;
}

pa_format_info* pa_format_info_new(void) {
    pa_format_info *f = pa_xnew(pa_format_info, 1);

    f->encoding = PA_ENCODING_INVALID;
    f->plist = pa_proplist_new();

    return f;
}