From 5165b29b1945e1cff5e8c042bd371a5b2da9b492 Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Sun, 18 Apr 2021 00:34:36 -0700
Subject: Optionally use RTKit/D-Bus to set elevated priority
If pthread_setschedparam fails or is unavailable.
---
core/rtkit.h | 80 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 80 insertions(+)
create mode 100644 core/rtkit.h
(limited to 'core/rtkit.h')
diff --git a/core/rtkit.h b/core/rtkit.h
new file mode 100644
index 00000000..96e81d4a
--- /dev/null
+++ b/core/rtkit.h
@@ -0,0 +1,80 @@
+/*-*- Mode: C; c-basic-offset: 8 -*-*/
+
+#ifndef foortkithfoo
+#define foortkithfoo
+
+/***
+ Copyright 2009 Lennart Poettering
+ Copyright 2010 David Henningsson <diwic@ubuntu.com>
+
+ Permission is hereby granted, free of charge, to any person
+ obtaining a copy of this software and associated documentation files
+ (the "Software"), to deal in the Software without restriction,
+ including without limitation the rights to use, copy, modify, merge,
+ publish, distribute, sublicense, and/or sell copies of the Software,
+ and to permit persons to whom the Software is furnished to do so,
+ subject to the following conditions:
+
+ The above copyright notice and this permission notice shall be
+ included in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ SOFTWARE.
+***/
+
+#include <sys/types.h>
+
+#include "dbus_wrap.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* This is the reference implementation for a client for
+ * RealtimeKit. You don't have to use this, but if do, just copy these
+ * sources into your repository */
+
+#define RTKIT_SERVICE_NAME "org.freedesktop.RealtimeKit1"
+#define RTKIT_OBJECT_PATH "/org/freedesktop/RealtimeKit1"
+
+/* This is mostly equivalent to sched_setparam(thread, SCHED_RR, {
+ * .sched_priority = priority }). 'thread' needs to be a kernel thread
+ * id as returned by gettid(), not a pthread_t! If 'thread' is 0 the
+ * current thread is used. The returned value is a negative errno
+ * style error code, or 0 on success. */
+int rtkit_make_realtime(DBusConnection *system_bus, pid_t thread, int priority);
+
+/* This is mostly equivalent to setpriority(PRIO_PROCESS, thread,
+ * nice_level). 'thread' needs to be a kernel thread id as returned by
+ * gettid(), not a pthread_t! If 'thread' is 0 the current thread is
+ * used. The returned value is a negative errno style error code, or 0
+ * on success.*/
+int rtkit_make_high_priority(DBusConnection *system_bus, pid_t thread, int nice_level);
+
+/* Return the maximum value of realtime priority available. Realtime requests
+ * above this value will fail. A negative value is an errno style error code.
+ */
+int rtkit_get_max_realtime_priority(DBusConnection *system_bus);
+
+/* Retreive the minimum value of nice level available. High prio requests
+ * below this value will fail. The returned value is a negative errno
+ * style error code, or 0 on success.*/
+int rtkit_get_min_nice_level(DBusConnection *system_bus, int *min_nice_level);
+
+/* Return the maximum value of RLIMIT_RTTIME to set before attempting a
+ * realtime request. A negative value is an errno style error code.
+ */
+long long rtkit_get_rttime_usec_max(DBusConnection *system_bus);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
--
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