Optionally use RTKit/D-Bus to set elevated priority

If pthread_setschedparam fails or is unavailable.

1 files changed, 80 insertions, 0 deletions

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 <[email protected]>
+
+        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