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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <Kernel/Syscall.h>
28#include <errno.h>
29#include <sched.h>
30
31extern "C" {
32
33int sched_yield()
34{
35 int rc = syscall(SC_yield);
36 __RETURN_WITH_ERRNO(rc, rc, -1);
37}
38
39int sched_get_priority_min(int policy)
40{
41 (void)policy;
42 return 0; // Idle
43}
44
45int sched_get_priority_max(int policy)
46{
47 (void)policy;
48 return 3; // High
49}
50
51int sched_setparam(pid_t pid, const struct sched_param* param)
52{
53 int rc = syscall(SC_sched_setparam, pid, param);
54 __RETURN_WITH_ERRNO(rc, rc, -1);
55}
56
57int sched_getparam(pid_t pid, struct sched_param* param)
58{
59 int rc = syscall(SC_sched_getparam, pid, param);
60 __RETURN_WITH_ERRNO(rc, rc, -1);
61}
62}