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ba95fa6152
The first terminator is for input parameters. The second terminator was for the output parameters. If an error occurs when calling MakeThreadHighPriority(), e.g. a bad thread id, then the reply from connection_send_with_reply_and_block() will be null.
117 lines
3.7 KiB
C
117 lines
3.7 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../../SDL_internal.h"
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#ifdef __LINUX__
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#include "SDL_error.h"
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#include "SDL_stdinc.h"
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#if !SDL_THREADS_DISABLED
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <pthread.h>
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#include "SDL_system.h"
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#include "SDL_dbus.h"
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#if SDL_USE_LIBDBUS
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/* d-bus queries to org.freedesktop.RealtimeKit1. */
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#define RTKIT_DBUS_NODE "org.freedesktop.RealtimeKit1"
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#define RTKIT_DBUS_PATH "/org/freedesktop/RealtimeKit1"
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#define RTKIT_DBUS_INTERFACE "org.freedesktop.RealtimeKit1"
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static pthread_once_t rtkit_initialize_once = PTHREAD_ONCE_INIT;
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static Sint32 rtkit_min_nice_level = -20;
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static void
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rtkit_initialize()
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{
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SDL_DBusContext *dbus = SDL_DBus_GetContext();
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/* Try getting minimum nice level: this is often greater than PRIO_MIN (-20). */
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if (!dbus || !SDL_DBus_QueryPropertyOnConnection(dbus->system_conn, RTKIT_DBUS_NODE, RTKIT_DBUS_PATH, RTKIT_DBUS_INTERFACE, "MinNiceLevel",
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DBUS_TYPE_INT32, &rtkit_min_nice_level)) {
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rtkit_min_nice_level = -20;
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}
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}
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static SDL_bool
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rtkit_setpriority(pid_t thread, int nice_level)
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{
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Uint64 ui64 = (Uint64)thread;
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Sint32 si32 = (Sint32)nice_level;
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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)
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si32 = rtkit_min_nice_level;
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if (!dbus || !SDL_DBus_CallMethodOnConnection(dbus->system_conn,
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RTKIT_DBUS_NODE, RTKIT_DBUS_PATH, RTKIT_DBUS_INTERFACE, "MakeThreadHighPriority",
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DBUS_TYPE_UINT64, &ui64, DBUS_TYPE_INT32, &si32, DBUS_TYPE_INVALID,
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DBUS_TYPE_INVALID)) {
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return SDL_FALSE;
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}
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return SDL_TRUE;
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}
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#endif /* dbus */
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#endif /* threads */
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/* this is a public symbol, so it has to exist even if threads are disabled. */
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int
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SDL_LinuxSetThreadPriority(Sint64 threadID, int priority)
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{
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#if SDL_THREADS_DISABLED
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return SDL_Unsupported();
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#else
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if (setpriority(PRIO_PROCESS, (id_t)threadID, priority) == 0) {
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return 0;
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}
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#if SDL_USE_LIBDBUS
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/* Note that this fails you most likely:
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* Have your process's scheduler incorrectly configured.
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See the requirements at:
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http://git.0pointer.net/rtkit.git/tree/README#n16
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* Encountered dbus/polkit security restrictions. Note
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that the RealtimeKit1 dbus endpoint is inaccessible
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over ssh connections for most common distro configs.
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You might want to check your local config for details:
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/usr/share/polkit-1/actions/org.freedesktop.RealtimeKit1.policy
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README and sample code at: http://git.0pointer.net/rtkit.git
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*/
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if (rtkit_setpriority((pid_t)threadID, priority)) {
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return 0;
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}
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#endif
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return SDL_SetError("setpriority() failed");
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#endif
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}
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#endif /* __LINUX__ */
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/* vi: set ts=4 sw=4 expandtab: */
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