[Info-vax] Returning data from Cobol AST routine.

[Lee Gleason]

On 9/29/2021 8:01 PM, Andrew Commons wrote:
> On Thursday, 30 September 2021 at 2:48:15 am UTC+9:30, Stephen Hoffman wrote:
>> On 2021-09-29 09:12:20 +0000, Andrew Commons said:
> 
>> INSQUE and REMQUE are interruptable. Best use equivalent the
>> interlocked queue operations INSQ*I and REMQ*I. Which are not.
>>
> The distinction between the instructions is the type of queue they handle.
> 
>  From the manual:
> 
> "Both INSQUE and REMQUE are implemented as noninterruptible instructions."
> 

   Perhaps he didn't mean non-interruptible - he meant that INSQUE and 
REMQUE are not multiprocessor safe, and INSQ*I and REMQ*I are. BY 
multiprocessor safe, I mean they can be used in a multiprocessor 
environment without additional means of synchronization of access.

--
Lee K. Gleason N5ZMR
Control-G Consultants
lee.gleason at comcast.net