From c89fe574493f438dd0e94bb9a89227e4ca84c0b7 Mon Sep 17 00:00:00 2001
From: "Randall S. Becker" <randall.becker@nexbridge.ca>
Date: Sat, 30 Mar 2024 22:28:02 +0000
Subject: NonStop: Do not call sleep() with a 0 value

This change ensures that sleep(0) is not invoked to cause unexpected
duplicate thread context switches when _REENTRANT is specified.

Fixes: #24009

Signed-off-by: Randall S. Becker <randall.becker@nexbridge.ca>

Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/24012)
---
 crypto/sleep.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'crypto')

diff --git a/crypto/sleep.c b/crypto/sleep.c
index dc97d4edc0..73467fb859 100644
--- a/crypto/sleep.c
+++ b/crypto/sleep.c
@@ -31,7 +31,8 @@ void OSSL_sleep(uint64_t millis)
     unsigned int s = (unsigned int)(millis / 1000);
     unsigned int us = (unsigned int)((millis % 1000) * 1000);
 
-    sleep(s);
+    if (s > 0)
+        sleep(s);
     usleep(us);
 # endif
 }
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