1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
/*-*- Mode: C; c-basic-offset: 8 -*-*/
/***
This file is part of RealtimeKit.
Copyright 2009 Lennart Poettering
RealtimeKit 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 3 of the License, or
(at your option) any later version.
RealtimeKit 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 RealtimeKit. If not, see <http://www.gnu.org/licenses/>.
***/
#include <errno.h>
#include <string.h>
#include <sched.h>
#include <stdio.h>
#include <sys/time.h>
#include <sys/resource.h>
#include "rtkit.h"
#ifndef SCHED_RESET_ON_FORK
#define SCHED_RESET_ON_FORK 0x40000000
#endif
#ifndef RLIMIT_RTTIME
#define RLIMIT_RTTIME 15
#endif
static void print_status(const char *t) {
int ret;
if ((ret = sched_getscheduler(0)) < 0) {
fprintf(stderr, "sched_getscheduler() failed: %s\n", strerror(errno));
return;
}
printf("%s:\n"
"\tSCHED_RESET_ON_FORK: %s\n",
t,
(ret & SCHED_RESET_ON_FORK) ? "yes" : "no");
if ((ret & ~SCHED_RESET_ON_FORK) == SCHED_RR) {
struct sched_param param;
if (sched_getparam(0, ¶m) < 0) {
fprintf(stderr, "sched_getschedparam() failed: %s\n", strerror(errno));
return;
}
printf("\tSCHED_RR with priority %i\n", param.sched_priority);
} else if ((ret & ~SCHED_RESET_ON_FORK) == SCHED_OTHER) {
errno = 0;
ret = getpriority(PRIO_PROCESS, 0);
if (errno != 0) {
fprintf(stderr, "getpriority() failed: %s\n", strerror(errno));
return;
}
printf("\tSCHED_OTHER with nice level: %i\n", ret);
} else
fprintf(stderr, "Neither SCHED_RR nor SCHED_OTHER.\n");
}
int main(int argc, char *argv[]) {
DBusError error;
DBusConnection *bus;
int r;
struct rlimit rlim;
dbus_error_init(&error);
if (!(bus = dbus_bus_get(DBUS_BUS_SYSTEM, &error))) {
fprintf(stderr, "Failed to connect to system bus: %s\n", error.message);
return 1;
}
memset(&rlim, 0, sizeof(rlim));
rlim.rlim_cur = rlim.rlim_max = 100000000ULL; /* 100ms */
if ((setrlimit(RLIMIT_RTTIME, &rlim) < 0))
fprintf(stderr, "Failed to set RLIMIT_RTTIME: %s\n", strerror(errno));
print_status("before");
if ((r = rtkit_make_high_priority(bus, 0, -10)) < 0)
fprintf(stderr, "Failed to become high priority: %s\n", strerror(-r));
else
printf("Sucessfully became high priority.\n");
print_status("after high priority");
if ((r = rtkit_make_realtime(bus, 0, 10)) < 0)
fprintf(stderr, "Failed to become realtime: %s\n", strerror(-r));
else
printf("Sucessfully became realtime.\n");
print_status("after realtime");
dbus_connection_unref(bus);
return 0;
}
|
