From e12db30345fa3c606096b24e038e9bb9c2be3b5d Mon Sep 17 00:00:00 2001
From: zeyus <zeyus@zeyus.com>
Date: Thu, 29 Aug 2024 14:40:25 +0200
Subject: [PATCH] Avoid infinite loop when function schedules callOnFlip for
 next frame

---
 psychopy/visual/window.py | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/psychopy/visual/window.py b/psychopy/visual/window.py
index d0498dea74..d00b075aa8 100644
--- a/psychopy/visual/window.py
+++ b/psychopy/visual/window.py
@@ -1320,10 +1320,12 @@ def flip(self, clearBuffer=True):
         self._frameTime = now = logging.defaultClock.getTime()
         self._frameTimes.append(self._frameTime)
 
-        # run other functions immediately after flip completes
-        for callEntry in self._toCall:
-            callEntry['function'](*callEntry['args'], **callEntry['kwargs'])
-        del self._toCall[:]
+        # run scheduled functions immediately after flip completes
+        n_items = len(self._toCall)
+        for i in range(n_items):
+            self._toCall[i]['function'](*self._toCall[i]['args'], **self._toCall[i]['kwargs'])
+        # leave newly scheduled functions for next flip
+        del self._toCall[:n_items]
 
         # do bookkeeping
         if self.recordFrameIntervals: