rt-sched: Add sched_setattr/sched_getattr API
Until we have a proper libc implementation we maintain a simple
version of it. We this new API we are able to use SCHED_DEADLINE.
This is shamelessly stolen from Dario Faggioli's libdl.
Signed-off-by: Daniel Wagner <daniel.wagner@bmw-carit.de>
Cc: Dario Faggioli <raistlin@linux.it>
diff --git a/Makefile b/Makefile
index 318a5c6..87e2326 100644
--- a/Makefile
+++ b/Makefile
@@ -99,8 +99,8 @@
hackbench: hackbench.o
$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)
-librttest.a: rt-utils.o error.o rt-get_cpu.o
- $(AR) rcs librttest.a rt-utils.o error.o rt-get_cpu.o
+librttest.a: rt-utils.o error.o rt-get_cpu.o rt-sched.o
+ $(AR) rcs librttest.a $^
CLEANUP = $(TARGETS) *.o .depend *.*~ *.orig *.rej rt-tests.spec *.d *.a
CLEANUP += $(if $(wildcard .git), ChangeLog)
diff --git a/src/include/rt-sched.h b/src/include/rt-sched.h
new file mode 100644
index 0000000..6c45f7a
--- /dev/null
+++ b/src/include/rt-sched.h
@@ -0,0 +1,76 @@
+/*
+ rt-sched.h - sched_setattr() and sched_getattr() API
+
+ (C) Dario Faggioli <raistlin@linux.it>, 2009, 2010
+ Copyright (C) 2014 BMW Car IT GmbH, Daniel Wagner <daniel.wagner@bmw-carit.de
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
+ USA */
+
+/* This file is based on Dario Faggioli's libdl. Eventually it will be
+ replaced by a proper implemenation of this API. */
+
+#ifndef __RT_SCHED_H__
+#define __RT_SCHED_H__
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#ifndef SCHED_DEADLINE
+#define SCHED_DEADLINE 6
+#endif
+
+#ifdef __x86_64__
+#define __NR_sched_setattr 314
+#define __NR_sched_getattr 315
+#endif
+
+#ifdef __i386__
+#define __NR_sched_setattr 351
+#define __NR_sched_getattr 352
+#endif
+
+#ifdef __arm__
+#define __NR_sched_setattr 380
+#define __NR_sched_getattr 381
+#endif
+
+struct sched_attr {
+ uint32_t size;
+ uint32_t sched_policy;
+ uint64_t sched_flags;
+
+ /* SCHED_NORMAL, SCHED_BATCH */
+ int32_t sched_nice;
+
+ /* SCHED_FIFO, SCHED_RR */
+ uint32_t sched_priority;
+
+ /* SCHED_DEADLINE */
+ uint64_t sched_runtime;
+ uint64_t sched_deadline;
+ uint64_t sched_period;
+};
+
+int sched_setattr(pid_t pid,
+ const struct sched_attr *attr,
+ unsigned int flags);
+
+int sched_getattr(pid_t pid,
+ struct sched_attr *attr,
+ unsigned int size,
+ unsigned int flags);
+
+#endif /* __RT_SCHED_H__ */
diff --git a/src/lib/rt-sched.c b/src/lib/rt-sched.c
new file mode 100644
index 0000000..4a8e3c4
--- /dev/null
+++ b/src/lib/rt-sched.c
@@ -0,0 +1,43 @@
+/*
+ rt-sched.h - sched_setattr() and sched_getattr() API
+
+ (C) Dario Faggioli <raistlin@linux.it>, 2009, 2010
+ Copyright (C) 2014 BMW Car IT GmbH, Daniel Wagner <daniel.wagner@bmw-carit.de
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
+ USA */
+
+/* This file is based on Dario Faggioli's libdl. Eventually it will be
+ replaced by a proper implemenation of this API. */
+
+#include <unistd.h>
+#include <sys/syscall.h>
+
+#include "rt-sched.h"
+
+int sched_setattr(pid_t pid,
+ const struct sched_attr *attr,
+ unsigned int flags)
+{
+ return syscall(__NR_sched_setattr, pid, attr, flags);
+}
+
+int sched_getattr(pid_t pid,
+ struct sched_attr *attr,
+ unsigned int size,
+ unsigned int flags)
+{
+ return syscall(__NR_sched_getattr, pid, attr, size, flags);
+}
