/*

Simple DirectMedia Layer

Copyright (C) 1997-2019 Sam Lantinga <slouken@libsdl.org>

This software is provided 'as-is', without any express or implied

warranty. In no event will the authors be held liable for any damages

arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,

including commercial applications, and to alter it and redistribute it

freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not

claim that you wrote the original software. If you use this software

in a product, an acknowledgment in the product documentation would be

appreciated but is not required.

2. Altered source versions must be plainly marked as such, and must not be

misrepresented as being the original software.

3. This notice may not be removed or altered from any source distribution.

*/

#include "../../SDL_internal.h"

#ifdef __LINUX__

#include "SDL_stdinc.h"

#if !SDL_THREADS_DISABLED

#include <sys/time.h>

#include <sys/resource.h>

#include <pthread.h>

#include "SDL_system.h"

#if HAVE_DBUS_DBUS_H

#include "SDL_dbus.h"

/* 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 /* dbus */

#endif /* threads */

/* 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 you most likely:

* Have your process's scheduler incorrectly configured.

See the requirements at:

http://git.0pointer.net/rtkit.git/tree/README#n16

* Encountered dbus/polkit security restrictions. Note

that the RealtimeKit1 dbus endpoint is inaccessible

over ssh connections for most common distro configs.

You might want to check your local config for details:

/usr/share/polkit-1/actions/org.freedesktop.RealtimeKit1.policy

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

}

#endif /* __LINUX__ */

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