github.com/zhuohuang-hust/src-cbuild@v0.0.0-20230105071821-c7aab3e7c840/mergeCode/runc/libcontainer/cgroups/fs/freezer.go (about)

     1  // +build linux
     2  
     3  package fs
     4  
     5  import (
     6  	"fmt"
     7  	"strings"
     8  	"time"
     9  
    10  	"github.com/opencontainers/runc/libcontainer/cgroups"
    11  	"github.com/opencontainers/runc/libcontainer/configs"
    12  )
    13  
    14  type FreezerGroup struct {
    15  }
    16  
    17  func (s *FreezerGroup) Name() string {
    18  	return "freezer"
    19  }
    20  
    21  func (s *FreezerGroup) Apply(d *cgroupData) error {
    22  	_, err := d.join("freezer")
    23  	if err != nil && !cgroups.IsNotFound(err) {
    24  		return err
    25  	}
    26  	return nil
    27  }
    28  
    29  func (s *FreezerGroup) Set(path string, cgroup *configs.Cgroup) error {
    30  	switch cgroup.Resources.Freezer {
    31  	case configs.Frozen, configs.Thawed:
    32  		if err := writeFile(path, "freezer.state", string(cgroup.Resources.Freezer)); err != nil {
    33  			return err
    34  		}
    35  
    36  		for {
    37  			state, err := readFile(path, "freezer.state")
    38  			if err != nil {
    39  				return err
    40  			}
    41  			if strings.TrimSpace(state) == string(cgroup.Resources.Freezer) {
    42  				break
    43  			}
    44  			time.Sleep(1 * time.Millisecond)
    45  		}
    46  	case configs.Undefined:
    47  		return nil
    48  	default:
    49  		return fmt.Errorf("Invalid argument '%s' to freezer.state", string(cgroup.Resources.Freezer))
    50  	}
    51  
    52  	return nil
    53  }
    54  
    55  func (s *FreezerGroup) Remove(d *cgroupData) error {
    56  	return removePath(d.path("freezer"))
    57  }
    58  
    59  func (s *FreezerGroup) GetStats(path string, stats *cgroups.Stats) error {
    60  	return nil
    61  }