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
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
package ext
import (
"encoding"
"strconv"
"sync"
"syscall"
)
// SchedPolicy denotes a scheduling policy defined in include/uapi/linux/sched.h.
type SchedPolicy int
// include/uapi/linux/sched.h
const (
SCHED_NORMAL SchedPolicy = iota
SCHED_FIFO
SCHED_RR
SCHED_BATCH
_SCHED_ISO // SCHED_ISO: reserved but not implemented yet
SCHED_IDLE
SCHED_DEADLINE
SCHED_EXT
SCHED_LAST SchedPolicy = iota - 1
)
var _ encoding.TextMarshaler = SCHED_LAST
var _ encoding.TextUnmarshaler = new(SCHED_LAST)
// String returns a unique representation of policy, also used in encoding.
func (policy SchedPolicy) String() string {
switch policy {
case SCHED_NORMAL:
return ""
case SCHED_FIFO:
return "fifo"
case SCHED_RR:
return "rr"
case SCHED_BATCH:
return "batch"
case SCHED_IDLE:
return "idle"
case SCHED_DEADLINE:
return "deadline"
case SCHED_EXT:
return "ext"
default:
return "invalid policy " + strconv.Itoa(int(policy))
}
}
// MarshalText performs bounds checking and returns the result of String.
func (policy SchedPolicy) MarshalText() ([]byte, error) {
if policy == _SCHED_ISO || policy < 0 || policy > SCHED_LAST {
return nil, syscall.EINVAL
}
return []byte(policy.String()), nil
}
// InvalidSchedPolicyError is an invalid string representation of a [SchedPolicy].
type InvalidSchedPolicyError string
func (InvalidSchedPolicyError) Unwrap() error { return syscall.EINVAL }
func (e InvalidSchedPolicyError) Error() string {
return "invalid scheduling policy " + strconv.Quote(string(e))
}
// UnmarshalText is the inverse of MarshalText.
func (policy *SchedPolicy) UnmarshalText(text []byte) error {
switch string(text) {
case "fifo":
*policy = SCHED_FIFO
case "rr":
*policy = SCHED_RR
case "batch":
*policy = SCHED_BATCH
case "idle":
*policy = SCHED_IDLE
case "deadline":
*policy = SCHED_DEADLINE
case "ext":
*policy = SCHED_EXT
case "":
*policy = 0
return nil
default:
return InvalidSchedPolicyError(text)
}
return nil
}
// for sched_get_priority_max and sched_get_priority_min
var (
schedPriority [SCHED_LAST + 1][2]Int
schedPriorityErr [SCHED_LAST + 1][2]error
schedPriorityOnce [SCHED_LAST + 1][2]sync.Once
)
// GetPriorityMax returns the maximum priority value that can be used with the
// scheduling algorithm identified by policy.
func (policy SchedPolicy) GetPriorityMax() (Int, error) {
schedPriorityOnce[policy][0].Do(func() {
priority, _, errno := syscall.Syscall(
syscall.SYS_SCHED_GET_PRIORITY_MAX,
uintptr(policy),
0, 0,
)
schedPriority[policy][0] = Int(priority)
if errno != 0 {
schedPriorityErr[policy][0] = errno
}
})
return schedPriority[policy][0], schedPriorityErr[policy][0]
}
// GetPriorityMin returns the minimum priority value that can be used with the
// scheduling algorithm identified by policy.
func (policy SchedPolicy) GetPriorityMin() (Int, error) {
schedPriorityOnce[policy][1].Do(func() {
priority, _, errno := syscall.Syscall(
syscall.SYS_SCHED_GET_PRIORITY_MIN,
uintptr(policy),
0, 0,
)
schedPriority[policy][1] = Int(priority)
if errno != 0 {
schedPriorityErr[policy][1] = errno
}
})
return schedPriority[policy][1], schedPriorityErr[policy][1]
}
|
