Question

我有一个要求，如果它已经运行了很长时间，我需要杀死/停止它。我正在考虑创建一个后台作业，以监视时间并在超时后通过适当的消息杀死主要作业，但是我不确定该怎么做。

这样的事情。

    function Kill-MainTask{
      $sb = { 
      Start-Sleep -Seconds 5
      throw "main task should end"  
       }
      $job1 = Start-Job -ScriptBlock $sb 
      Write-Host "main task running"
      Start-Sleep -Seconds 10
      #This statement should not run
      Write-Host "main task not finished"
    }
    Kill-MainTask

当我调用Kill-MainTask函数时，它应该显示“正在运行的主任务”，但5秒钟后应该抛出。

Answer 1

有几个现有示例显示了如何使用此主要和子作业监视用例。请参阅下面的示例和资源链接。

Monitoring the Progress of a PowerShell Job

Quick Tip To Find Out What Your Background Jobs Are Doing

示例：

这是一个简单的脚本，可创建5个后台作业（如   由$ Num定义）。提交后，我们将开始监视   工作进度。我们将$ TotProg定义为0开始，然后查询   状态说明–

，由于这会返回一个数组，因此我们只需要   最后一个元素，因此是-1元素引用-并将其添加到   $ TotProg。之后，我们检查$ TotProg是否大于0   （否则您将得到除以零的错误），显示我们的进度   酒吧，请等待几秒钟，然后再次循环。继续运行代码   （不要在ISE中逐步了解它，以真正了解我的意思是   来运行它。）

$Num = 5

$Jobs = @()
ForEach ($Job in (1..$Num))
{   $Jobs += Start-Job -ScriptBlock { 
        $Count = 1
        Do {
            Write-Progress -Id 2 -Activity "Background Job" -Status $Count -PercentComplete 1
            $Count ++
            Start-Sleep -Seconds 4
        } Until ($Count -gt 5)
    }
}
$Total = $Num * 5

Write-Progress -Id 1 -Activity "Watching Background Jobs" -Status "Waiting for background jobs to started" -PercentComplete 0
Do {
    $TotProg = 0
    ForEach ($Job in $Jobs)
    {   Try {
            $Info = 
            $TotProg += ($Job | Get-Job).ChildJobs[0].Progress.StatusDescription[-1]
        }
        Catch {
            Start-Sleep -Seconds 3
            Continue
        }
    }
    If ($TotProg)
    {   Write-Progress -Id 1 -Activity "Watching Background Jobs" -Status "Waiting for background jobs to complete: $TotProg of $Total" -PercentComplete (($TotProg / $Total) * 100)
    }
    Start-Sleep -Seconds 3
} Until (($Jobs | Where State -eq "Running").Count -eq 0)

$Jobs | Remove-Job -Force

Write-Progress -Id 1 -Activity "Watching Background Jobs" -Status "Completed!  $Total of $Total" -PercentComplete 100
Start-Sleep -Seconds 1
Write-Progress -Id 1 -Activity "Watching Background Jobs" -Status "Completed!  $Total of $Total" -Completed

或者这种方法

Creating A Timeout Feature In Your PowerShell Scripts

# define a timeout
$Timeout = 10 ## seconds

# Code for the scriptblock
$jobs = Get-Job
$Condition = {param($jobs) 'Running' -notin $jobs.State }
$ConditionArgs = $jobs

# define how long in between checks
$RetryInterval = 5

# Start the timer
$timer = [Diagnostics.Stopwatch]::StartNew()

# Invoke code actions
while (($timer.Elapsed.TotalSeconds -lt $Timeout) -and (& $Condition $ConditionArgs)) {

    ## Wait a specific interval
    Start-Sleep -Seconds $RetryInterval

    ## Check the time
    $totalSecs = [math]::Round($timer.Elapsed.TotalSeconds,0)
    Write-Verbose -Message "Still waiting for action to complete after [$totalSecs] seconds..."
}


# The action either completed or timed out. Stop the timer.
$timer.Stop()

# Return status of what happened
if ($timer.Elapsed.TotalSeconds -gt $Timeout) 
{ throw 'Action did not complete before timeout period.' } 
else 
{ Write-Verbose -Message 'Action completed before the timeout period.'  }

如何通过后台作业杀死主要\上级任务？

1 个答案: