Re: [Qemu-devel] [PATCH v3 4/4] hw/qxl-render: drop cursor locks, replace with pipe

[Jes Sorensen]

On 03/16/11 16:52, Alon Levy wrote:
> +void qxl_server_request_cursor_set(PCIQXLDevice *qxl, QEMUCursor *c, int x, 
> int y)
> +{
> +    QXLServerCursorSetRequest req;
> +    int r;
> +
> +    req.req = QXL_SERVER_CURSOR_SET;
> +    req.data.c = c;
> +    req.data.x = x;
> +    req.data.y = y;
> +    r = write(qxl->ssd.pipe[1], &req, sizeof(req));
> +    assert(r == sizeof(req));
> +}

There's a number of asserts here, which I am not sure is a good thing. I
don't understand how far down the code this is, and if it is really
fatal if this write fails?

> +/* called from spice server thread context only */
> +void qxl_server_request_cursor_move(PCIQXLDevice *qxl, int x, int y)
> +{
> +    QXLServerCursorMoveRequest req;
> +    int r;
> +
> +    req.req = QXL_SERVER_CURSOR_MOVE;
> +    req.data.x = x;
> +    req.data.y = y;
> +    r = write(qxl->ssd.pipe[1], &req, sizeof(req));
> +    assert(r == sizeof(req));

ditto

> +static void read_bytes(int fd, void *buf, int len_requested)
> +{
> +    int len;
> +    int total_len = 0;
> +
> +    do {
> +        len = read(fd, buf, len_requested - total_len);
> +        if (len < 0) {
> +            if (errno == EINTR || errno == EAGAIN) {
> +                continue;
> +            }
> +            perror("qxl: pipe_read: read failed");
> +            /* will abort once it's out of the while loop */
> +            break;
> +        }
> +        total_len += len;
> +        buf = (uint8_t *)buf + len;
> +    } while (total_len < len_requested);
> +    assert(total_len == len_requested);

and here?

Cheers,
Jes