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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.	 Call‐
       ing 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.	Unfortunately,
       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 prob‐
		     lems  exists,  the	 application  should set asynchronous-
		     acknowledgement mode to get greater efficiency.

Files
See Also
       intro(3ncs)

						       rpc_set_async_ack(3ncs)
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