Commit c7b713714a52dac2a499a1840d2d066dacabf973
2018-12-05T17:53:38
Whoops, forgot to add a new source file. :/
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diff --git a/src/core/linux/SDL_threadprio.c b/src/core/linux/SDL_threadprio.c
new file mode 100644
index 0000000..2c58993
--- /dev/null
+++ b/src/core/linux/SDL_threadprio.c
@@ -0,0 +1,111 @@
+/*
+ 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"
+
+#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: */