From de52e08a23c2e982068e2fac4e91357710a883d2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@gnu.org>
Date: Tue, 1 Oct 2024 18:47:22 +0200
Subject: [PATCH] =?UTF-8?q?timer-wheel:=20Add=20=E2=80=98timer-wheel-remov?=
 =?UTF-8?q?e!=E2=80=99.?=
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* fibers/timer-wheel.scm (timer-wheel-remove!): New procedure.
---
 fibers/timer-wheel.scm | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/fibers/timer-wheel.scm b/fibers/timer-wheel.scm
index 5ca37ea..de98918 100644
--- a/fibers/timer-wheel.scm
+++ b/fibers/timer-wheel.scm
@@ -31,6 +31,7 @@
   #:use-module (ice-9 format)
   #:export (make-timer-wheel
             timer-wheel-add!
+            timer-wheel-remove!
             timer-wheel-next-entry-time
             timer-wheel-next-tick-start
             timer-wheel-next-tick-end
@@ -141,6 +142,18 @@
         (else
          (timer-wheel-add! (or outer (add-outer-wheel! wheel)) t obj)))))))
 
+(define (timer-wheel-remove! wheel entry)
+  "Remove @var{entry}, a timer entry as returned by @code{timer-wheel-add!},
+from @var{wheel}."
+  (match entry
+    (($ <timer-entry> prev next)
+     (when prev
+       (set-timer-entry-next! prev next)
+       (set-timer-entry-prev! entry #f))
+     (when next
+       (set-timer-entry-prev! next prev)
+       (set-timer-entry-next! entry #f)))))
+
 (define (timer-wheel-next-entry-time wheel)
   (define (slot-min-time head)
     (let lp ((entry (timer-entry-next head)) (min #f))