PowerShell多线程执行前后台作业的例子

下面例子使用powershell线程运行了两个后台任务和一个前台任务，创建几个运行时间长点的任务，并且每个任务命令中添加使用start-sleep。

$start = get-date

$task1 = { start-sleep -seconds 4; get-service }
$task2 = { start-sleep -seconds 5; get-service }
$task3 = { start-sleep -seconds 3; get-service }

# run 2 in separate threads, 1 in the foreground
$thread1 = [powershell]::create()
$job1 = $thread1.addscript($task1).begininvoke()

$thread2 = [powershell]::create()
$job2 = $thread2.addscript($task2).begininvoke()

$result3 = invoke-command -scriptblock $task3

do { start-sleep -milliseconds 100 } until ($job1.iscompleted -and $job2.iscompleted)

$result1 = $thread1.endinvoke($job1)
$result2 = $thread2.endinvoke($job2)

$thread1.runspace.close()
$thread1.dispose()

$thread2.runspace.close()
$thread2.dispose()

$end = get-date
write-host -foregroundcolor red ($end - $start).totalseconds

相继执行这3个任务从start-sleep中看至少需要花费12秒。但是这个脚本仅执行了5秒多一点。其结果保存为$result1, $result2和$result3。与后台作业对比，它在返回大数据用时将差不多。

文章出处：http://www.pstips.net/