From 71cefb0754ca71383692bc3190e79681393ebcd0 Mon Sep 17 00:00:00 2001
From: Jan Beich <jbeich@FreeBSD.org>
Date: Sat, 15 Jul 2023 07:36:17 +0000
Subject: [PATCH] x11-wm/plasma5-kwin: support mac_priority(4) on Wayland

PR:		272511
Approved by:	?
---
 x11-wm/plasma5-kwin/Makefile                  |  1 +
 .../files/patch-src_utils_realtime.cpp        | 35 +++++++++++++++++++
 x11-wm/plasma5-kwin/pkg-message               |  8 +++++
 3 files changed, 44 insertions(+)
 create mode 100644 x11-wm/plasma5-kwin/files/patch-src_utils_realtime.cpp
 create mode 100644 x11-wm/plasma5-kwin/pkg-message

diff --git a/x11-wm/plasma5-kwin/Makefile b/x11-wm/plasma5-kwin/Makefile
index 6d3853a76212..60ff9205cba9 100644
--- a/x11-wm/plasma5-kwin/Makefile
+++ b/x11-wm/plasma5-kwin/Makefile
@@ -1,5 +1,6 @@
 PORTNAME=	kwin
 DISTVERSION=	${KDE_PLASMA_VERSION}
+PORTREVISION=	1
 CATEGORIES=	x11-wm kde kde-plasma
 
 MAINTAINER=	kde@FreeBSD.org
diff --git a/x11-wm/plasma5-kwin/files/patch-src_utils_realtime.cpp b/x11-wm/plasma5-kwin/files/patch-src_utils_realtime.cpp
new file mode 100644
index 000000000000..48efbb08a1c0
--- /dev/null
+++ b/x11-wm/plasma5-kwin/files/patch-src_utils_realtime.cpp
@@ -0,0 +1,35 @@
+- Emulate SCHED_RESET_ON_FORK via pthread_atfork
+- Switch to pthread_setschedparam as Linux sched_setscheduler
+  operates on threads contrary to POSIX
+
+--- src/utils/realtime.cpp.orig	2023-06-20 13:32:36 UTC
++++ src/utils/realtime.cpp
+@@ -8,19 +8,24 @@
+ 
+ #include "config-kwin.h"
+ 
+-#include <sched.h>
++#include <pthread.h>
+ 
+ namespace KWin
+ {
+ 
+ void gainRealTime()
+ {
+-#if HAVE_SCHED_RESET_ON_FORK
+     const int minPriority = sched_get_priority_min(SCHED_RR);
+     sched_param sp;
+     sp.sched_priority = minPriority;
+-    sched_setscheduler(0, SCHED_RR | SCHED_RESET_ON_FORK, &sp);
+-#endif
++    if (pthread_setschedparam(pthread_self(), SCHED_RR, &sp))
++        return;
++
++    pthread_atfork(NULL, NULL, []() {
++        sched_param sp;
++        sp.sched_priority = 0;
++        pthread_setschedparam(pthread_self(), SCHED_OTHER, &sp);
++    });
+ }
+ 
+ } // namespace KWin
diff --git a/x11-wm/plasma5-kwin/pkg-message b/x11-wm/plasma5-kwin/pkg-message
new file mode 100644
index 000000000000..df793f16184b
--- /dev/null
+++ b/x11-wm/plasma5-kwin/pkg-message
@@ -0,0 +1,8 @@
+[
+{ type: install
+  message: <<EOM
+Notes:
+- kwin_wayland can use mac_priority(4) to avoid stutter during high load
+EOM
+}
+]