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cpuset.go
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cpuset.go
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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package perffile
import (
"fmt"
"sort"
"strconv"
"strings"
)
// A CPUSet represents a set of CPUs by CPU index.
type CPUSet []int
func parseCPUSet(str string) (CPUSet, error) {
var err error
out := CPUSet{}
for _, r := range strings.Split(str, ",") {
var lo, hi int
dash := strings.Index(r, "-")
if dash == -1 {
lo, err = strconv.Atoi(r)
if err != nil {
return nil, err
}
hi = lo
} else {
lo, err = strconv.Atoi(r[:dash])
if err != nil {
return nil, err
}
hi, err = strconv.Atoi(r[dash+1:])
if err != nil {
return nil, err
}
}
for cpu := lo; cpu <= hi; cpu++ {
out = append(out, cpu)
}
}
sort.Ints(out)
i, j := 0, 0
for ; i < len(out); i++ {
if i != j && out[i] == out[j] {
continue
}
out[j] = out[i]
j++
}
return out, nil
}
func (c CPUSet) String() string {
if len(c) == 0 {
return ""
}
out := ""
lo, hi := c[0], c[0]-1
flush := func() {
if lo == hi {
out = fmt.Sprintf("%s,%d", out, lo)
} else {
out = fmt.Sprintf("%s,%d-%d", out, lo, hi)
}
}
for _, cpu := range c {
if cpu == hi+1 {
hi = cpu
} else {
flush()
lo, hi = cpu, cpu
}
}
flush()
return out[1:]
}