Re: Ada and (SIGTERM?)

[Maciej Sobczak <see.my.homepage@gmail.com>]

On 16 Sie, 15:11, Tomek Wałkuski <tomek.walku...@gmail.com> wrote:

> And... how to quit all of them? I cannot force all workers and manager
> to look at Quit flag in protected object.

If you use the queue of work items, a possible strategy is to define a
special value for the work item[*], so-called "poison pill", that will
be recognized by workers and cause them to quit. If you have N workers
(and you better know how many there are), then just push N "poison
pills" into the queue and it's over.

The poison pill strategy can be also used when there is no queue and a
single manager decides who will get the next work item for processing.

[*] if work items are passed around by pointers (access values), then
null value is a good candidate.

> If workers are looking at Quit flag (and manager is not) everything
> terminates, but I have to fire SIGTERM signal 6 times (when I have 5
> workers).

Why? Do you clear the Quit flag when it is read?

--
Maciej Sobczak * www.msobczak.com * www.inspirel.com

Database Access Library for Ada: www.inspirel.com/soci-ada