a geicko-2 based round robin ranking system designed to test c++ battleship submissions
battleship.dunkirk.sh
dunkirk.sh
1// Copyright 2018 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5// CPU affinity functions
6
7package unix
8
9import (
10 "math/bits"
11 "unsafe"
12)
13
14const cpuSetSize = _CPU_SETSIZE / _NCPUBITS
15
16// CPUSet represents a CPU affinity mask.
17type CPUSet [cpuSetSize]cpuMask
18
19func schedAffinity(trap uintptr, pid int, set *CPUSet) error {
20 _, _, e := RawSyscall(trap, uintptr(pid), uintptr(unsafe.Sizeof(*set)), uintptr(unsafe.Pointer(set)))
21 if e != 0 {
22 return errnoErr(e)
23 }
24 return nil
25}
26
27// SchedGetaffinity gets the CPU affinity mask of the thread specified by pid.
28// If pid is 0 the calling thread is used.
29func SchedGetaffinity(pid int, set *CPUSet) error {
30 return schedAffinity(SYS_SCHED_GETAFFINITY, pid, set)
31}
32
33// SchedSetaffinity sets the CPU affinity mask of the thread specified by pid.
34// If pid is 0 the calling thread is used.
35func SchedSetaffinity(pid int, set *CPUSet) error {
36 return schedAffinity(SYS_SCHED_SETAFFINITY, pid, set)
37}
38
39// Zero clears the set s, so that it contains no CPUs.
40func (s *CPUSet) Zero() {
41 clear(s[:])
42}
43
44func cpuBitsIndex(cpu int) int {
45 return cpu / _NCPUBITS
46}
47
48func cpuBitsMask(cpu int) cpuMask {
49 return cpuMask(1 << (uint(cpu) % _NCPUBITS))
50}
51
52// Set adds cpu to the set s.
53func (s *CPUSet) Set(cpu int) {
54 i := cpuBitsIndex(cpu)
55 if i < len(s) {
56 s[i] |= cpuBitsMask(cpu)
57 }
58}
59
60// Clear removes cpu from the set s.
61func (s *CPUSet) Clear(cpu int) {
62 i := cpuBitsIndex(cpu)
63 if i < len(s) {
64 s[i] &^= cpuBitsMask(cpu)
65 }
66}
67
68// IsSet reports whether cpu is in the set s.
69func (s *CPUSet) IsSet(cpu int) bool {
70 i := cpuBitsIndex(cpu)
71 if i < len(s) {
72 return s[i]&cpuBitsMask(cpu) != 0
73 }
74 return false
75}
76
77// Count returns the number of CPUs in the set s.
78func (s *CPUSet) Count() int {
79 c := 0
80 for _, b := range s {
81 c += bits.OnesCount64(uint64(b))
82 }
83 return c
84}