#if !SDL_THREADS_DISABLED

 #include <sys/time.h>

 #include <sys/resource.h>

 #include <pthread.h>

 #include "SDL_system.h"

 #endif

 #if !SDL_THREADS_DISABLED

 /* d-bus queries to org.freedesktop.RealtimeKit1. */

 #define RTKIT_DBUS_NODE "org.freedesktop.RealtimeKit1"

 #define RTKIT_DBUS_PATH "/org/freedesktop/RealtimeKit1"

 #define RTKIT_DBUS_INTERFACE "org.freedesktop.RealtimeKit1"

 static pthread_once_t rtkit_initialize_once = PTHREAD_ONCE_INIT;

 static Sint32 rtkit_min_nice_level = -20;

 static void

 rtkit_initialize()

 {

     SDL_DBusContext *dbus = SDL_DBus_GetContext();

     /* Try getting minimum nice level: this is often greater than PRIO_MIN (-20). */

     if (!dbus || !SDL_DBus_QueryPropertyOnConnection(dbus->system_conn, RTKIT_DBUS_NODE, RTKIT_DBUS_PATH, RTKIT_DBUS_INTERFACE, "MinNiceLevel",

                                             DBUS_TYPE_INT32, &rtkit_min_nice_level)) {

         rtkit_min_nice_level = -20;

     }

 }

 static SDL_bool

 rtkit_setpriority(pid_t thread, int nice_level)

 {

     Uint64 ui64 = (Uint64)thread;

     Sint32 si32 = (Sint32)nice_level;

     SDL_DBusContext *dbus = SDL_DBus_GetContext();

     pthread_once(&rtkit_initialize_once, rtkit_initialize);

     if (si32 < rtkit_min_nice_level)

         si32 = rtkit_min_nice_level;

     if (!dbus || !SDL_DBus_CallMethodOnConnection(dbus->system_conn,

             RTKIT_DBUS_NODE, RTKIT_DBUS_PATH, RTKIT_DBUS_INTERFACE, "MakeThreadHighPriority",

             DBUS_TYPE_UINT64, &ui64, DBUS_TYPE_INT32, &si32, DBUS_TYPE_INVALID,

             DBUS_TYPE_INVALID)) {

         return SDL_FALSE;

     }

     return SDL_TRUE;

 }

 #endif

 /* this is a public symbol, so it has to exist even if threads are disabled. */

 int

 SDL_LinuxSetThreadPriority(Sint64 threadID, int priority)

 {

 #if SDL_THREADS_DISABLED

     return SDL_Unsupported();

 #else

     if (setpriority(PRIO_PROCESS, (id_t)threadID, priority) == 0) {

         return 0;

     }

 #if SDL_USE_LIBDBUS

     /* Note that this fails if you're trying to set high priority

        and you don't have root permission. BUT DON'T RUN AS ROOT!

        You can grant the ability to increase thread priority by

        running the following command on your application binary:

           sudo setcap 'cap_sys_nice=eip' <application>

        Let's try setting priority with RealtimeKit...

        README and sample code at: http://git.0pointer.net/rtkit.git

     */

     if (rtkit_setpriority((pid_t)threadID, priority)) {

         return 0;

     }

 #endif

     return SDL_SetError("setpriority() failed");

 #endif

 }