On Fri, 2007-03-02 at 10:56 -0600, Steve Wise wrote:
> On Fri, 2007-03-02 at 16:32 +0000, Tang, Changqing wrote:
> >
> > HI,
> > I did not realize that ibv_get_async_event() is a blocking call,
> > it forces me to call it in another thread. But if I don't want to use
> > thread in my application, how do I use this function ?
> >
> > Thanks.
> >
> > --CQ
>
> You can select() or poll() on the async file descriptor for the QP.
>
> Then you only call ibv_get_async_event() when poll/select indicates
> there is something to read.
Something like this:
struct my_cxt {
...
struct ibv_context *context;
struct rdma_event_channel *rch;
...
};
<snip>
fds[0].fd = ctx->rch->fd;
fds[0].events = POLLIN|POLLERR;
fds[1].fd = ctx->context->async_fd;
fds[1].events = POLLHUP|POLLNVAL|POLLPRI|POLLOUT|POLLIN|POLLERR;
if (poll(fds, 2, -1) == -1) {
perror("poll");
exit(1);
}
if (fds[0].revents) {
struct rdma_cm_event *event;
rdma_get_cm_event(ctx->rch, &event);
printf("RDMA CM EVENT %d - %s!\n", event->event,
rdma_str_event(event));
rdma_ack_cm_event(event);
...
}
if (fds[1].revents) {
struct ibv_async_event event;
ibv_get_async_event(ctx->context, &event);
printf("ASYNC EVENT %d - %s!\n", event.event_type,
ibv_str_async_event(&event));
ibv_ack_async_event(&event);
...
}
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