rtdServer - Online in the Cloud

PROGRAM:

NAME

rtdServer - image event dispatcher for RTD

SYNOPSIS

rtdServer [-v] [-p] [-s]

DESCRIPTION

rtdServer is the process that manages the image event mechanism. Clients register to the
rtdServer via the rtdInitImageEvt call. When a client attaches to a camera source an
incoming image event will be forwarded to this client. Several clients can attach to the
same camera source as the multicasting of event notification is supported by the
rtdServer. Image events received from image sources where no clients are attached are
simply discarded. Clients can also attach to image sources that not have registered yet as
the rtdServer supports a independence between image event producer and image event
consumer.

Furthermore rtdServer contains a simulator part that can be used to simulate the
generation of image events. This feature is reserved for testing purposes only. Similarly,
it also contains a performance test facility, in which several areas of shared memory are
sent to a client Rtd in quick succession, and measurements are taken on certain
performance parameters (see RtdPerformanceTool(3/n).

The rtdServer also implements semaphore locking of shared memory, to avoid the possibility
of the RTD client reading the shared memory at the same time as the CCD writes (this is
known as "image jitter"). The server program expects the CCD software to set a semaphore
against any shared memory that has been written to (effectively to lock it). The server
will then increment this semaphore by the number of RTD clients less one. If semaphores
are not implemented in the incoming image event, no action is taken. The overall locking
scheme is discussed in more detail in rtdSem(1). Semaphore locking is implemented in the
simulator facility.

-v verbose mode

-p port number, default 5555. Set with RTD_SERVER_PORT

-t delay between image events in msec (default 5)

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