Greenwood, Steve wrote:
> I have a thread that uses ibv_get_cq_event to handling completing RDMA
> requests. This call seems to have roughly the same capabilities as the
> Mellanox vapi call EVAPI_poll_cq_block with one important exception.
> The open-fabrics routine does not have a timeout argument.
> Beyond restructuring my application, is there a simple way to make get
> ibv_get_cq_event return without a message arriving?
sure, yes, for both questions: the actual object to deliver cq event is
struct ibv_comp_channel whose only field is a file descriptor with which
you can implement the requirements, use poll/select to set a timeout, or
make it non blocking such that you can
int rc;
struct ibv_comp_channel my_ch;
struct pollfd my_pollfd;
flags = fcntl(my_ch.fd, F_SETFL)
rc = fcntl(my_ch.fd, F_SETFL, flags | O_NONBLOCK)
will make ibv_get_event to return immediately if there is no event to
consume at the channel
my_pollfd.fd = my_ch.fd;
my_pollfd.events = POLLIN;
my_pollfd.revents = 0;
rc = poll(&my_pollfd, 1, ms_timeout);
will allow you to either get a timeout if ms milliseconds have elapsed
or there is an event waiting for you to consume
Or.
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