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/* | ||
Simple DirectMedia Layer | ||
Copyright (C) 1997-2018 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" | ||
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#ifdef __LINUX__ | ||
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#if !SDL_THREADS_DISABLED | ||
#include <sys/time.h> | ||
#include <sys/resource.h> | ||
#include <pthread.h> | ||
#include "SDL_system.h" | ||
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#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" | ||
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static pthread_once_t rtkit_initialize_once = PTHREAD_ONCE_INIT; | ||
static Sint32 rtkit_min_nice_level = -20; | ||
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static void | ||
rtkit_initialize() | ||
{ | ||
SDL_DBusContext *dbus = SDL_DBus_GetContext(); | ||
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/* 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; | ||
} | ||
} | ||
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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(); | ||
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pthread_once(&rtkit_initialize_once, rtkit_initialize); | ||
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if (si32 < rtkit_min_nice_level) | ||
si32 = rtkit_min_nice_level; | ||
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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 */ | ||
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/* 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; | ||
} | ||
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#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 | ||
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return SDL_SetError("setpriority() failed"); | ||
#endif | ||
} | ||
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#endif /* __LINUX__ */ | ||
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/* vi: set ts=4 sw=4 expandtab: */ |