Thanks, I will look into this.
On Thursday, 6 September 2018 03:25:43 UTC+1, gneuner2 wrote:
>
>
> On 9/4/2018 11:46 AM, George Neuner wrote:
> >
> > AFAIK there is no way to simply 'check' if the semaphore is available.
> >
>
> I was wrong - there is a way using events: semaphore-peek-evt c
On 9/4/2018 11:46 AM, George Neuner wrote:
AFAIK there is no way to simply 'check' if the semaphore is available.
I was wrong - there is a way using events: semaphore-peek-evt can check
whether a semaphore is ready without affecting its counter.
https://docs.racket-lang.org/reference/se
post count) (make-sema 3))
(count)
(wait)
(count)
(post)
(count)
_
From: racket-users@googlegroups.com [mailto:racket-users@googlegroups.com] On
Behalf Of George Neuner
Sent: 04 September 2018 17:47
To: Craig Allen
Cc: racket users
Subject: Re: [racket-users] Semaphore-count
On 9/4
On 9/4/2018 8:31 AM, Craig Allen wrote:
I saw that function, but was scared off by its documentation:
Like semaphore-wait, but semaphore-try-wait? never blocks execution.
If sema’s internal counter is zero, semaphore-try-wait? returns #f
immediately without decrementing the counter. If sema’s
I saw that function, but was scared off by its documentation:
Like semaphore-wait, but semaphore-try-wait? never blocks execution. If sema’s
internal counter is zero, semaphore-try-wait? returns #f immediately
without decrementing the counter. If sema’s counter is positive, it is
decremented an
There's no `semaphore-count`, but you can use `semaphore-try-wait?` to
poll a semaphore instead of blocking.
At Tue, 4 Sep 2018 04:47:46 -0700 (PDT), Craig Allen wrote:
> So I have this snippet pinched from Rosetta Code:
>
> (define-syntax-rule (define/atomic (name arg ...) body ...)
> (define
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