ron at flownet.com
Wed Jun 2 18:43:00 UTC 2021
Your description is a little unclear, but it sounds like you are doing two things:
1. Setting up a global variable to count in real time and
2. Polling that variable to trigger a periodic action.
If that’s the case, you don’t need 1 at all, just call (get-internal-real-time). That is a counter that increments every microsecond. The rate at which it increments is stored in a global constant internal-time-units-per-second, which on CCL is equal to 1000000.
GET-INTERNAL-REAL-TIME is part of the ANSI spec so should will work in any Common Lisp.
On Jun 2, 2021, at 11:26 AM, dave at synergy.org wrote:
> My code uses timers. I have a library that implements them. It expects to
> receive a call periodically, i.e. every 200ms. On SBCL I hook SIGALRM. The
> handler simply increments a global variable. Later on in the main loop the
> variable is swapped in a without-interrupts body and the appropriate number
> of ticks are dispatched. My code is single-threaded. How could I implement
> this in CCL?
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