C++ qemu_bh_delete函数代码示例

static int xen_9pfs_free(struct XenLegacyDevice *xendev)
{
    Xen9pfsDev *xen_9pdev = container_of(xendev, Xen9pfsDev, xendev);
    int i;

    if (xen_9pdev->rings[0].evtchndev != NULL) {
        xen_9pfs_disconnect(xendev);
    }

    for (i = 0; i < xen_9pdev->num_rings; i++) {
        if (xen_9pdev->rings[i].data != NULL) {
            xen_be_unmap_grant_refs(&xen_9pdev->xendev,
                                    xen_9pdev->rings[i].data,
                                    (1 << xen_9pdev->rings[i].ring_order));
        }
        if (xen_9pdev->rings[i].intf != NULL) {
            xen_be_unmap_grant_refs(&xen_9pdev->xendev,
                                    xen_9pdev->rings[i].intf,
                                    1);
        }
        if (xen_9pdev->rings[i].bh != NULL) {
            qemu_bh_delete(xen_9pdev->rings[i].bh);
        }
    }

    g_free(xen_9pdev->id);
    g_free(xen_9pdev->tag);
    g_free(xen_9pdev->path);
    g_free(xen_9pdev->security_model);
    g_free(xen_9pdev->rings);
    return 0;
}

static void migrate_fd_cleanup(void *opaque)
{
    MigrationState *s = opaque;

    qemu_bh_delete(s->cleanup_bh);
    s->cleanup_bh = NULL;

    if (s->file) {
        DPRINTF("closing file\n");
        qemu_mutex_unlock_iothread();
        qemu_thread_join(&s->thread);
        qemu_mutex_lock_iothread();

        qemu_fclose(s->file);
        s->file = NULL;
    }

    assert(s->state != MIG_STATE_ACTIVE);

    if (s->state != MIG_STATE_COMPLETED) {
        qemu_savevm_state_cancel();
        if (s->state == MIG_STATE_CANCELLING) {
            migrate_set_state(s, MIG_STATE_CANCELLING, MIG_STATE_CANCELLED);
        }
    }

    notifier_list_notify(&migration_state_notifiers, s);
}

void laio_detach_aio_context(void *s_, AioContext *old_context)
{
    struct qemu_laio_state *s = s_;

    aio_set_event_notifier(old_context, &s->e, NULL);
    qemu_bh_delete(s->completion_bh);
}

static void iscsi_co_generic_bh_cb(void *opaque)
{
    struct IscsiTask *iTask = opaque;
    iTask->complete = 1;
    qemu_bh_delete(iTask->bh);
    qemu_coroutine_enter(iTask->co, NULL);
}

static void reschedule_dma(void *opaque)
{
    DMAAIOCB *dbs = (DMAAIOCB *)opaque;

    qemu_bh_delete(dbs->bh);
    dbs->bh = NULL;
    dma_blk_cb(dbs, 0);
}

static void qemu_gluster_complete_aio(void *opaque)
{
    GlusterAIOCB *acb = (GlusterAIOCB *)opaque;

    qemu_bh_delete(acb->bh);
    acb->bh = NULL;
    qemu_coroutine_enter(acb->coroutine, NULL);
}

/* This callback gets invoked when we have pure sparseness */
static void tar_sparse_cb(void *opaque)
{
    TarAIOCB *acb = (TarAIOCB *)opaque;

    acb->common.cb(acb->common.opaque, 0);
    qemu_bh_delete(acb->bh);
    qemu_aio_release(acb);
}

static void bh_delete_cb(void *opaque)
{
    BHTestData *data = opaque;
    if (++data->n < data->max) {
        qemu_bh_schedule(data->bh);
    } else {
        qemu_bh_delete(data->bh);
        data->bh = NULL;
    }
}

static void virtio_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq)
{
    VirtIOBlock *s = to_virtio_blk(vdev);
    VirtIOBlockReq *req;
    MultiReqBuffer mrb = {
        .num_writes = 0,
    };

    while ((req = virtio_blk_get_request(s))) {
        virtio_blk_handle_request(req, &mrb);
    }

    virtio_submit_multiwrite(s->bs, &mrb);

    /*
     * FIXME: Want to check for completions before returning to guest mode,
     * so cached reads and writes are reported as quickly as possible. But
     * that should be done in the generic block layer.
     */
}

static void virtio_blk_dma_restart_bh(void *opaque)
{
    VirtIOBlock *s = opaque;
    VirtIOBlockReq *req = s->rq;
    MultiReqBuffer mrb = {
        .num_writes = 0,
    };

    qemu_bh_delete(s->bh);
    s->bh = NULL;

    s->rq = NULL;

    while (req) {
        virtio_blk_handle_request(req, &mrb);
        req = req->next;
    }

    virtio_submit_multiwrite(s->bs, &mrb);
}

static void virtio_blk_dma_restart_cb(void *opaque, int running,
                                      RunState state)
{
    VirtIOBlock *s = opaque;

    if (!running)
        return;

    if (!s->bh) {
        s->bh = qemu_bh_new(virtio_blk_dma_restart_bh, s);
        qemu_bh_schedule(s->bh);
    }
}

static void curl_readv_bh_cb(void *p)
{
    CURLState *state;

    CURLAIOCB *acb = p;
    BDRVCURLState *s = acb->common.bs->opaque;

    qemu_bh_delete(acb->bh);
    acb->bh = NULL;

    size_t start = acb->sector_num * SECTOR_SIZE;
    size_t end;

    // In case we have the requested data already (e.g. read-ahead),
    // we can just call the callback and be done.
    switch (curl_find_buf(s, start, acb->nb_sectors * SECTOR_SIZE, acb)) {
        case FIND_RET_OK:
            qemu_aio_release(acb);
            // fall through
        case FIND_RET_WAIT:
            return;
        default:
            break;
    }

    // No cache found, so let's start a new request
    state = curl_init_state(s);
    if (!state) {
        acb->common.cb(acb->common.opaque, -EIO);
        qemu_aio_release(acb);
        return;
    }

    acb->start = 0;
    acb->end = (acb->nb_sectors * SECTOR_SIZE);

    state->buf_off = 0;
    if (state->orig_buf)
        g_free(state->orig_buf);
    state->buf_start = start;
    state->buf_len = acb->end + s->readahead_size;
    end = MIN(start + state->buf_len, s->len) - 1;
    state->orig_buf = g_malloc(state->buf_len);
    state->acb[0] = acb;

    snprintf(state->range, 127, "%zd-%zd", start, end);
    DPRINTF("CURL (AIO): Reading %d at %zd (%s)\n",
            (acb->nb_sectors * SECTOR_SIZE), start, state->range);
    curl_easy_setopt(state->curl, CURLOPT_RANGE, state->range);

    curl_multi_add_handle(s->multi, state->curl);
    curl_multi_do(s);

}

/* Context: QEMU global mutex held */
void virtio_blk_data_plane_destroy(VirtIOBlockDataPlane *s)
{
    if (!s) {
        return;
    }

    virtio_blk_data_plane_stop(s);
    qemu_bh_delete(s->bh);
    object_unref(OBJECT(s->iothread));
    g_free(s);
}

static void
qlooper_destroy(Looper* ll)
{
    QLooper*  looper = (QLooper*)ll;
    QLoopIo*  io;

    while ((io = looper->io_list) != NULL)
        qloopio_free(io);

    qemu_bh_delete(looper->io_bh);
    qemu_free(looper);
}

static void
iscsi_readv_writev_bh_cb(void *p)
{
    IscsiAIOCB *acb = p;

    qemu_bh_delete(acb->bh);

    if (acb->canceled == 0) {
        acb->common.cb(acb->common.opaque, acb->status);
    }

    qemu_aio_release(acb);
}

/* Context: QEMU global mutex held */
void virtio_blk_data_plane_destroy(VirtIOBlockDataPlane *s)
{
    if (!s) {
        return;
    }

    virtio_blk_data_plane_stop(s);
    blk_op_unblock_all(s->conf->conf.blk, s->blocker);
    error_free(s->blocker);
    qemu_bh_delete(s->bh);
    object_unref(OBJECT(s->iothread));
    g_free(s);
}

static void virtio_balloon_device_unrealize(DeviceState *dev, Error **errp)
{
    VirtIODevice *vdev = VIRTIO_DEVICE(dev);
    VirtIOBalloon *s = VIRTIO_BALLOON(dev);

    if (virtio_balloon_free_page_support(s)) {
        qemu_bh_delete(s->free_page_bh);
        virtio_balloon_free_page_stop(s);
        precopy_remove_notifier(&s->free_page_report_notify);
    }
    balloon_stats_destroy_timer(s);
    qemu_remove_balloon_handler(s);
    virtio_cleanup(vdev);
}