Re: [Dpcl-user] Ais_send problems

[John R. <joh...@us...>]

Harald,

Ais_send() should be used to send messages of size 4k or less, so the tool
will need to
chop large messages.

A negative return from Ais_send() indicates that the message was not sent.
A zero return
indicates it will be sent. For positive return see the ShmMessage.h. If the
return is
MSG_BUSY it will not do to loop and retry in this case, because it may be
that the same
thread already has an Ais_send lock and has been interrupted by the signal
which
activates the phase (or the deameon has disconnected from the application).

Since functions called due to phases are called on behalf of a signal, they
must be
signal safe; ie they cannot use malloc or printf (which may in turn use
malloc).

Generally, the intent of phases was to get a snapshot of the application.
The tool needs
to be able to tolerant the potenial of missing a beat occasionally.

Regards,
John

John Robb
Application Tools Development
Poughkeepsie Unix Development Lab
(845)433-7177  (TL/293-7177)
joh...@us...