From e963cff72de0efbd4e9c0b177caab88363f67d2e Mon Sep 17 00:00:00 2001
From: DavePutz <dwputz@gmail.com>
Date: Mon, 13 Jul 2020 22:27:06 -0500
Subject: [PATCH] Issue #2949 Run background checks during long multiplications

---
 py/mpz.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/py/mpz.c b/py/mpz.c
index 7800cdcc45..8b8541c737 100644
--- a/py/mpz.c
+++ b/py/mpz.c
@@ -443,8 +443,11 @@ STATIC size_t mpn_mul(mpz_dig_t *idig, mpz_dig_t *jdig, size_t jlen, mpz_dig_t *
             *id++ = carry;
         }
 
-        ilen = id - oidig;
+      ilen = id - oidig;
+      // check to prevent usb starvation
+      RUN_BACKGROUND_TASKS;
     }
+    
 
     return ilen;
 }