| /* |
| 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__ |
| |
| #if !SDL_THREADS_DISABLED |
| #include <sys/time.h> |
| #include <sys/resource.h> |
| #include <pthread.h> |
| #include "SDL_system.h" |
| |
| #if SDL_USE_LIBDBUS |
| #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 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 |
| } |
| |
| #endif /* __LINUX__ */ |
| |
| /* vi: set ts=4 sw=4 expandtab: */ |