C++ PA_REFCNT_VALUE函数代码示例

void pa_asyncmsgq_flush(pa_asyncmsgq *a, bool run) {
    pa_assert(PA_REFCNT_VALUE(a) > 0);

    for (;;) {
        pa_msgobject *object;
        int code;
        void *data;
        int64_t offset;
        pa_memchunk chunk;
        int ret;

        if (pa_asyncmsgq_get(a, &object, &code, &data, &offset, &chunk, false) < 0)
            return;

        if (!run) {
            pa_asyncmsgq_done(a, -1);
            continue;
        }

        pa_asyncmsgq_ref(a);
        ret = pa_asyncmsgq_dispatch(object, code, data, offset, &chunk);
        pa_asyncmsgq_done(a, ret);
        pa_asyncmsgq_unref(a);
    }
}

pa_packet* pa_packet_ref(pa_packet *p) {
    pa_assert(p);
    pa_assert(PA_REFCNT_VALUE(p) >= 1);

    PA_REFCNT_INC(p);
    return p;
}

void pa_asyncmsgq_done(pa_asyncmsgq *a, int ret) {
    pa_assert(PA_REFCNT_VALUE(a) > 0);
    pa_assert(a);
    pa_assert(a->current);

    if (a->current->semaphore) {
        a->current->ret = ret;
        pa_semaphore_post(a->current->semaphore);
    } else {

        if (a->current->free_cb)
            a->current->free_cb(a->current->userdata);

        if (a->current->object)
            pa_msgobject_unref(a->current->object);

        if (a->current->memchunk.memblock)
            pa_memblock_unref(a->current->memchunk.memblock);

        if (pa_flist_push(PA_STATIC_FLIST_GET(asyncmsgq), a->current) < 0)
            pa_xfree(a->current);
    }

    a->current = NULL;
}

int pa_asyncmsgq_wait_for(pa_asyncmsgq *a, int code) {
    int c;
    pa_assert(PA_REFCNT_VALUE(a) > 0);

    pa_asyncmsgq_ref(a);

    do {
        pa_msgobject *o;
        void *data;
        int64_t offset;
        pa_memchunk chunk;
        int ret;

        if (pa_asyncmsgq_get(a, &o, &c, &data, &offset, &chunk, true) < 0)
            return -1;

        ret = pa_asyncmsgq_dispatch(o, c, data, offset, &chunk);
        pa_asyncmsgq_done(a, ret);

    } while (c != code);

    pa_asyncmsgq_unref(a);

    return 0;
}

int pa_asyncmsgq_get(pa_asyncmsgq *a, pa_msgobject **object, int *code, void **userdata, int64_t *offset, pa_memchunk *chunk, bool wait_op) {
    pa_assert(PA_REFCNT_VALUE(a) > 0);
    pa_assert(!a->current);

    if (!(a->current = pa_asyncq_pop(a->asyncq, wait_op))) {
/*         pa_log("failure"); */
        return -1;
    }

/*     pa_log("success"); */

    if (code)
        *code = a->current->code;
    if (userdata)
        *userdata = a->current->userdata;
    if (offset)
        *offset = a->current->offset;
    if (object) {
        if ((*object = a->current->object))
            pa_msgobject_assert_ref(*object);
    }
    if (chunk)
        *chunk = a->current->memchunk;

/*     pa_log_debug("Get q=%p object=%p (%s) code=%i data=%p chunk.length=%lu", */
/*                  (void*) a, */
/*                  (void*) a->current->object, */
/*                  a->current->object ? a->current->object->parent.type_name : NULL, */
/*                  a->current->code, */
/*                  (void*) a->current->userdata, */
/*                  (unsigned long) a->current->memchunk.length); */

    return 0;
}

int pa_asyncmsgq_send(pa_asyncmsgq *a, pa_msgobject *object, int code, const void *userdata, int64_t offset, const pa_memchunk *chunk) {
    struct asyncmsgq_item i;
    pa_assert(PA_REFCNT_VALUE(a) > 0);

    i.code = code;
    i.object = object;
    i.userdata = (void*) userdata;
    i.free_cb = NULL;
    i.ret = -1;
    i.offset = offset;
    if (chunk) {
        pa_assert(chunk->memblock);
        i.memchunk = *chunk;
    } else
        pa_memchunk_reset(&i.memchunk);

    if (!(i.semaphore = pa_flist_pop(PA_STATIC_FLIST_GET(semaphores))))
        i.semaphore = pa_semaphore_new(0);

    /* This mutex makes the queue multiple-writer safe. This lock is only used on the writing side */
    pa_mutex_lock(a->mutex);
    pa_assert_se(pa_asyncq_push(a->asyncq, &i, true) == 0);
    pa_mutex_unlock(a->mutex);

    pa_semaphore_wait(i.semaphore);

    if (pa_flist_push(PA_STATIC_FLIST_GET(semaphores), i.semaphore) < 0)
        pa_semaphore_free(i.semaphore);

    return i.ret;
}

void pa_asyncmsgq_post(pa_asyncmsgq *a, pa_msgobject *object, int code, const void *userdata, int64_t offset, const pa_memchunk *chunk, pa_free_cb_t free_cb) {
    struct asyncmsgq_item *i;
    pa_assert(PA_REFCNT_VALUE(a) > 0);

    if (!(i = pa_flist_pop(PA_STATIC_FLIST_GET(asyncmsgq))))
        i = pa_xnew(struct asyncmsgq_item, 1);

    i->code = code;
    i->object = object ? pa_msgobject_ref(object) : NULL;
    i->userdata = (void*) userdata;
    i->free_cb = free_cb;
    i->offset = offset;
    if (chunk) {
        pa_assert(chunk->memblock);
        i->memchunk = *chunk;
        pa_memblock_ref(i->memchunk.memblock);
    } else
        pa_memchunk_reset(&i->memchunk);
    i->semaphore = NULL;

    /* This mutex makes the queue multiple-writer safe. This lock is only used on the writing side */
    pa_mutex_lock(a->mutex);
    pa_asyncq_post(a->asyncq, i);
    pa_mutex_unlock(a->mutex);
}

DBusConnection* pa_dbus_connection_get(pa_dbus_connection *c){
    pa_assert(c);
    pa_assert(PA_REFCNT_VALUE(c) > 0);
    pa_assert(c->connection);

    return pa_dbus_wrap_connection_get(c->connection);
}

pa_operation *pa_ext_device_restore_test(
        pa_context *c,
        pa_ext_device_restore_test_cb_t cb,
        void *userdata) {

    uint32_t tag;
    pa_operation *o;
    pa_tagstruct *t;

    pa_assert(c);
    pa_assert(PA_REFCNT_VALUE(c) >= 1);

    PA_CHECK_VALIDITY_RETURN_NULL(c, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY_RETURN_NULL(c, c->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(c, c->version >= 14, PA_ERR_NOTSUPPORTED);

    o = pa_operation_new(c, NULL, (pa_operation_cb_t) cb, userdata);

    t = pa_tagstruct_command(c, PA_COMMAND_EXTENSION, &tag);
    pa_tagstruct_putu32(t, PA_INVALID_INDEX);
    pa_tagstruct_puts(t, "module-device-restore");
    pa_tagstruct_putu32(t, SUBCOMMAND_TEST);
    pa_pstream_send_tagstruct(c->pstream, t);
    pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT, ext_device_restore_test_cb, pa_operation_ref(o), (pa_free_cb_t) pa_operation_unref);

    return o;
}

pa_operation *pa_ext_device_manager_subscribe(
        pa_context *c,
        int enable,
        pa_context_success_cb_t cb,
        void *userdata) {

    uint32_t tag;
    pa_operation *o;
    pa_tagstruct *t;

    pa_assert(c);
    pa_assert(PA_REFCNT_VALUE(c) >= 1);

    PA_CHECK_VALIDITY_RETURN_NULL(c, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY_RETURN_NULL(c, c->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(c, c->version >= 14, PA_ERR_NOTSUPPORTED);

    o = pa_operation_new(c, NULL, (pa_operation_cb_t) cb, userdata);

    t = pa_tagstruct_command(c, PA_COMMAND_EXTENSION, &tag);
    pa_tagstruct_putu32(t, PA_INVALID_INDEX);
    pa_tagstruct_puts(t, "module-device-manager");
    pa_tagstruct_putu32(t, SUBCOMMAND_SUBSCRIBE);
    pa_tagstruct_put_boolean(t, enable);
    pa_pstream_send_tagstruct(c->pstream, t);
    pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT, pa_context_simple_ack_callback, pa_operation_ref(o), (pa_free_cb_t) pa_operation_unref);

    return o;
}

void pa_context_fail(pa_context *c, int error) {
    pa_assert(c);
    pa_assert(PA_REFCNT_VALUE(c) >= 1);

    pa_context_set_error(c, error);
    pa_context_set_state(c, PA_CONTEXT_FAILED);
}

void pa_context_simple_ack_callback(pa_pdispatch *pd, uint32_t command, uint32_t tag, pa_tagstruct *t, void *userdata) {
    pa_operation *o = userdata;
    int success = 1;

    pa_assert(pd);
    pa_assert(o);
    pa_assert(PA_REFCNT_VALUE(o) >= 1);

    if (!o->context)
        goto finish;

    if (command != PA_COMMAND_REPLY) {
        if (pa_context_handle_error(o->context, command, t, false) < 0)
            goto finish;

        success = 0;
    } else if (!pa_tagstruct_eof(t)) {
        pa_context_fail(o->context, PA_ERR_PROTOCOL);
        goto finish;
    }

    if (o->callback) {
        pa_context_success_cb_t cb = (pa_context_success_cb_t) o->callback;
        cb(o->context, success, o->userdata);
    }

finish:
    pa_operation_done(o);
    pa_operation_unref(o);
}

pa_context* pa_context_ref(pa_context *c) {
    pa_assert(c);
    pa_assert(PA_REFCNT_VALUE(c) >= 1);

    PA_REFCNT_INC(c);
    return c;
}

void pa_context_unref(pa_context *c) {
    pa_assert(c);
    pa_assert(PA_REFCNT_VALUE(c) >= 1);

    if (PA_REFCNT_DEC(c) <= 0)
        context_free(c);
}

pa_operation *pa_context_proplist_remove(pa_context *c, const char *const keys[], pa_context_success_cb_t cb, void *userdata) {
    pa_operation *o;
    pa_tagstruct *t;
    uint32_t tag;
    const char * const *k;

    pa_assert(c);
    pa_assert(PA_REFCNT_VALUE(c) >= 1);

    PA_CHECK_VALIDITY_RETURN_NULL(c, !pa_detect_fork(), PA_ERR_FORKED);
    PA_CHECK_VALIDITY_RETURN_NULL(c, keys && keys[0], PA_ERR_INVALID);
    PA_CHECK_VALIDITY_RETURN_NULL(c, c->state == PA_CONTEXT_READY, PA_ERR_BADSTATE);
    PA_CHECK_VALIDITY_RETURN_NULL(c, c->version >= 13, PA_ERR_NOTSUPPORTED);

    o = pa_operation_new(c, NULL, (pa_operation_cb_t) cb, userdata);

    t = pa_tagstruct_command(c, PA_COMMAND_REMOVE_CLIENT_PROPLIST, &tag);

    for (k = keys; *k; k++)
        pa_tagstruct_puts(t, *k);

    pa_tagstruct_puts(t, NULL);

    pa_pstream_send_tagstruct(c->pstream, t);
    pa_pdispatch_register_reply(c->pdispatch, tag, DEFAULT_TIMEOUT, pa_context_simple_ack_callback, pa_operation_ref(o), (pa_free_cb_t) pa_operation_unref);

    /* Please note that we don't update c->proplist here, because we
     * don't export that field */

    return o;
}