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freezer.go
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freezer.go
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package fs
import (
"io/ioutil"
"path/filepath"
"strings"
"time"
"github.com/docker/libcontainer/cgroups"
)
type freezerGroup struct {
}
func (s *freezerGroup) Set(d *data) error {
switch d.c.Freezer {
case cgroups.Frozen, cgroups.Thawed:
dir, err := d.path("freezer")
if err != nil {
return err
}
if err := writeFile(dir, "freezer.state", string(d.c.Freezer)); err != nil {
return err
}
for {
state, err := readFile(dir, "freezer.state")
if err != nil {
return err
}
if strings.TrimSpace(state) == string(d.c.Freezer) {
break
}
time.Sleep(1 * time.Millisecond)
}
default:
if _, err := d.join("freezer"); err != nil && err != cgroups.ErrNotFound {
return err
}
}
return nil
}
func (s *freezerGroup) Remove(d *data) error {
return removePath(d.path("freezer"))
}
func getFreezerFileData(path string) (string, error) {
data, err := ioutil.ReadFile(path)
return strings.TrimSuffix(string(data), "\n"), err
}
func (s *freezerGroup) GetStats(d *data, stats *cgroups.Stats) error {
path, err := d.path("freezer")
if err != nil {
return err
}
var data string
if data, err = getFreezerFileData(filepath.Join(path, "freezer.parent_freezing")); err != nil {
return err
}
stats.FreezerStats.ParentState = data
if data, err = getFreezerFileData(filepath.Join(path, "freezer.self_freezing")); err != nil {
return err
}
stats.FreezerStats.SelfState = data
return nil
}