rpc_set_async_ack(3ncs) 												   rpc_set_async_ack(3ncs)

Name
       rpc_set_async_ack - set or clear asynchronous-acknowledgement mode (client only)

Syntax
       #include <idl/c/rpc.h>

       void rpc_$set_async_ack (state)
       unsigned long state;

Arguments
       state		   If  "true" (nonzero), asynchronous-acknowledgement mode is set.  If "false" (zero), synchronous-acknowledgement mode is
			   set.

Description
       The call sets or clears asynchronous-acknowledgement mode in a client.

       Synchronous-acknowledgement mode is the default.  Calling with a nonzero value for state sets asynchronous-acknowledgement  mode.   Calling
       it with a zero value for state sets synchronous-acknowledgement mode.

       After  a  client  makes	a remote procedure call and receives a reply from a server, the RPC runtime library at the client acknowledges its
       receipt of the reply.  This "reply acknowledgement" can occur either synchronously (before the runtime library returns to  the  caller)	or
       asynchronously (after the runtime library returns to the caller).

       It  is  generally good to allow asynchronous reply acknowledgements.  Asynchronous-acknowledgement mode can save the client runtime library
       from making explicit reply acknowledgements, because after a client receives a reply, it may shortly issue another call that can act as	an
       implicit acknowledgement.

       Asynchronous-acknowledgement  mode  requires  that  an "alarm" be set to go off sometime after the remote procedure call returns.  Unfortu-
       nately, setting the alarm can cause two problems:

	      1      There may be only one alarm that can be set, and the application itself may be trying to use it.

	      2      If, at the time the alarm goes off, the application is blocked in a system call that is doing I/O to a "slow device" (such as
		     a	terminal),  the  system  call will return an error (with the EINTR errno); the application may not be coded to expect this
		     error.  If neither of these problems exists, the application should set  asynchronous-acknowledgement  mode  to  get  greater
		     efficiency.

Files
See Also
       intro(3ncs)

															   rpc_set_async_ack(3ncs)