From 0916cf985c20a35ed7accfb732ebe904b9ddcd33 Mon Sep 17 00:00:00 2001
From: Ralph Lange <ralph.lange@gmx.de>
Date: Mon, 10 Nov 2025 14:56:41 +0100
Subject: [PATCH] libCom/posix: don't memlock() if opted out of FIFO scheduling

---
 modules/libcom/src/osi/os/posix/osdThread.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/modules/libcom/src/osi/os/posix/osdThread.c b/modules/libcom/src/osi/os/posix/osdThread.c
index 4839c8b19..50eb911e1 100644
--- a/modules/libcom/src/osi/os/posix/osdThread.c
+++ b/modules/libcom/src/osi/os/posix/osdThread.c
@@ -466,7 +466,7 @@ void epicsThreadRealtimeLock(void)
     mlocked = 0;
 #if USE_MEMLOCK
 #ifndef RTEMS_LEGACY_STACK // seems to be part of libbsd?
-    if (pcommonAttr->maxPriority > pcommonAttr->minPriority) {
+    if (pcommonAttr->maxPriority > pcommonAttr->minPriority && wantPrioScheduling) {
         int status = mlockall(MCL_CURRENT | MCL_FUTURE);
 
         if (status) {