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
|
/*
* Copyright (C) 2003-2014 The Music Player Daemon Project
* http://www.musicpd.org
*
* 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.
*/
#ifndef MPD_THREAD_UTIL_HXX
#define MPD_THREAD_UTIL_HXX
#ifdef __linux__
#include <sched.h>
#include <sys/syscall.h>
#include <unistd.h>
#elif defined(WIN32)
#include <windows.h>
#endif
#ifdef __linux__
static int
ioprio_set(int which, int who, int ioprio)
{
return syscall(__NR_ioprio_set, which, who, ioprio);
}
static void
ioprio_set_idle()
{
static constexpr int _IOPRIO_WHO_PROCESS = 1;
static constexpr int _IOPRIO_CLASS_IDLE = 3;
static constexpr int _IOPRIO_CLASS_SHIFT = 13;
static constexpr int _IOPRIO_IDLE =
(_IOPRIO_CLASS_IDLE << _IOPRIO_CLASS_SHIFT) | 7;
ioprio_set(_IOPRIO_WHO_PROCESS, 0, _IOPRIO_IDLE);
}
#endif
/**
* Lower the current thread's priority to "idle" (very low).
*/
static inline void
SetThreadIdlePriority()
{
#ifdef __linux__
#ifdef SCHED_IDLE
static struct sched_param sched_param;
sched_setscheduler(0, SCHED_IDLE, &sched_param);
#endif
ioprio_set_idle();
#elif defined(WIN32)
SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_IDLE);
#endif
};
/**
* Raise the current thread's priority to "real-time" (very high).
*/
static inline void
SetThreadRealtime()
{
#ifdef __linux__
struct sched_param sched_param;
sched_param.sched_priority = 50;
int policy = SCHED_FIFO;
#ifdef SCHED_RESET_ON_FORK
policy |= SCHED_RESET_ON_FORK;
#endif
sched_setscheduler(0, policy, &sched_param);
#endif
};
#endif
|
