wide/output/processes.go

107 lines
2.6 KiB
Go

// Copyright (c) 2014, B3log
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package output
import (
"os"
"sync"
"github.com/b3log/wide/session"
"github.com/golang/glog"
)
// Type of process set.
type procs map[string][]*os.Process
// Processse of all users.
//
// <sid, []*os.Process>
var processes = procs{}
// Exclusive lock.
var mutex sync.Mutex
// add adds the specified process to the user process set.
func (procs *procs) add(wSession *session.WideSession, proc *os.Process) {
mutex.Lock()
defer mutex.Unlock()
sid := wSession.Id
userProcesses := (*procs)[sid]
userProcesses = append(userProcesses, proc)
(*procs)[sid] = userProcesses
// bind process with wide session
wSession.SetProcesses(userProcesses)
glog.V(5).Infof("Session [%s] has [%d] processes", sid, len((*procs)[sid]))
}
// remove removes the specified process from the user process set.
func (procs *procs) remove(wSession *session.WideSession, proc *os.Process) {
mutex.Lock()
defer mutex.Unlock()
sid := wSession.Id
userProcesses := (*procs)[sid]
var newProcesses []*os.Process
for i, p := range userProcesses {
if p.Pid == proc.Pid {
newProcesses = append(userProcesses[:i], userProcesses[i+1:]...) // remove it
(*procs)[sid] = newProcesses
// bind process with wide session
wSession.SetProcesses(newProcesses)
glog.V(5).Infof("Session [%s] has [%d] processes", sid, len((*procs)[sid]))
return
}
}
}
// kill kills a process specified by the given pid.
func (procs *procs) kill(wSession *session.WideSession, pid int) {
mutex.Lock()
defer mutex.Unlock()
sid := wSession.Id
userProcesses := (*procs)[sid]
for i, p := range userProcesses {
if p.Pid == pid {
if err := p.Kill(); nil != err {
glog.Error("Kill a process [pid=%d] of session [%s] failed [error=%v]", pid, sid, err)
} else {
var newProcesses []*os.Process
newProcesses = append(userProcesses[:i], userProcesses[i+1:]...)
(*procs)[sid] = newProcesses
// bind process with wide session
wSession.SetProcesses(newProcesses)
glog.V(5).Infof("Killed a process [pid=%d] of session [%s]", pid, sid)
}
return
}
}
}