commit ebf411c1e5f20c6db7962cea587d6169246078e0
Author: Rémi Bernon <rbernon@codeweavers.com>
Date:   Wed Jul 3 10:54:06 2019 +0200
Subject: [PATCH 2/3] server: Fallback to RTKIT for thread priorities.

sched_setscheduler and setpriority usually require elevated privileges
to succeed and most Linux distributions ship rtkit daemon with a dbus
interface to enable unprivileged control of some scheduling parameters.

--- a/configure.ac
+++ b/configure.ac
@@ -1416,7 +1416,7 @@
 if test "x$with_dbus" != "xno"
 then
     WINE_PACKAGE_FLAGS(DBUS,[dbus-1],,,,
-        [AC_CHECK_HEADER([dbus/dbus.h],
+        [AC_CHECK_HEADERS([dbus/dbus.h],
             [WINE_CHECK_SONAME(dbus-1, dbus_connection_close,,[DBUS_CFLAGS=""],[$DBUS_LIBS])],
             [DBUS_CFLAGS=""])])
 fi
--- a/server/Makefile.in
+++ b/server/Makefile.in
@@ -50,6 +50,7 @@
 	wineserver.man.in \
 	winstation.c
 
-UNIX_LIBS = $(LDEXECFLAGS) $(RT_LIBS) $(INOTIFY_LIBS) $(PROCSTAT_LIBS)
+UNIX_CFLAGS = $(DBUS_CFLAGS)
+UNIX_LIBS = $(LDEXECFLAGS) $(RT_LIBS) $(INOTIFY_LIBS) $(PROCSTAT_LIBS) $(DBUS_LIBS)
 
 unicode_EXTRADEFS = -DNLSDIR="\"${nlsdir}\"" -DBIN_TO_NLSDIR=\"`${MAKEDEP} -R ${bindir} ${nlsdir}`\"
--- a/server/thread.c
+++ b/server/thread.c
@@ -59,6 +59,77 @@
 #include "esync.h"
 #include "fsync.h"
 
+#ifdef HAVE_DBUS_DBUS_H
+#include <dbus/dbus.h>
+
+static int rtkit_set_realtime( dbus_uint64_t process, dbus_uint64_t thread, dbus_uint32_t priority )
+{
+    DBusConnection* dbus;
+    DBusMessage *msg;
+    int ret = -1;
+
+    if ((dbus = dbus_bus_get(DBUS_BUS_SYSTEM, NULL)))
+    {
+        dbus_connection_set_exit_on_disconnect(dbus, 0);
+
+        if ((msg = dbus_message_new_method_call("org.freedesktop.RealtimeKit1",
+                                                "/org/freedesktop/RealtimeKit1",
+                                                "org.freedesktop.RealtimeKit1",
+                                                "MakeThreadRealtimeWithPID")))
+        {
+            dbus_message_set_no_reply(msg, 1);
+
+            if (dbus_message_append_args(msg,
+                                         DBUS_TYPE_UINT64, &process,
+                                         DBUS_TYPE_UINT64, &thread,
+                                         DBUS_TYPE_UINT32, &priority,
+                                         DBUS_TYPE_INVALID) &&
+                dbus_connection_send(dbus, msg, NULL))
+                ret = 0;
+
+            dbus_message_unref(msg);
+        }
+
+        dbus_connection_unref(dbus);
+    }
+
+    return ret;
+}
+
+static int rtkit_set_niceness( dbus_uint64_t process, dbus_uint64_t thread, dbus_int32_t niceness )
+{
+    DBusConnection* dbus;
+    DBusMessage *msg;
+    int ret = -1;
+
+    if ((dbus = dbus_bus_get(DBUS_BUS_SYSTEM, NULL)))
+    {
+        dbus_connection_set_exit_on_disconnect(dbus, 0);
+
+        if ((msg = dbus_message_new_method_call("org.freedesktop.RealtimeKit1",
+                                                "/org/freedesktop/RealtimeKit1",
+                                                "org.freedesktop.RealtimeKit1",
+                                                "MakeThreadHighPriorityWithPID")))
+        {
+            dbus_message_set_no_reply(msg, 1);
+
+            if (dbus_message_append_args(msg,
+                                         DBUS_TYPE_UINT64, &process,
+                                         DBUS_TYPE_UINT64, &thread,
+                                         DBUS_TYPE_INT32, &niceness,
+                                         DBUS_TYPE_INVALID) &&
+                dbus_connection_send(dbus, msg, NULL))
+                ret = 0;
+
+            dbus_message_unref(msg);
+        }
+
+        dbus_connection_unref(dbus);
+    }
+
+    return ret;
+}
+#endif
 
 /* thread queues */
 
@@ -655,7 +726,8 @@
     return mask;
 }
 
-#if defined(HAVE_SCHED_SETSCHEDULER) || defined(HAVE_SETPRIORITY)
+#if defined(HAVE_SCHED_SETSCHEDULER) || defined(HAVE_SETPRIORITY) || \
+    defined(HAVE_DBUS_DBUS_H)
 static int get_unix_priority( int priority_class, int priority )
 {
     switch (priority_class) {
@@ -778,6 +850,11 @@
         if (sched_setscheduler( thread->unix_tid, SCHED_RR|SCHED_RESET_ON_FORK, &param ) == 0)
             return 0;
 #endif
+#ifdef HAVE_DBUS_DBUS_H
+        if (rtkit_set_realtime( thread->unix_pid, thread->unix_tid,
+                                get_unix_priority( priority_class, priority ) ) == 0)
+            return 0;
+#endif
     }
     else
     {
@@ -786,6 +863,11 @@
                          get_unix_priority( priority_class, priority ) ) == 0)
             return 0;
 #endif
+#ifdef HAVE_DBUS_DBUS_H
+        if (rtkit_set_niceness( thread->unix_pid, thread->unix_tid,
+                                get_unix_priority( priority_class, priority ) ) == 0)
+            return 0;
+#endif
     }
 #endif