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Powershellでカウンティングセマフォ

Last updated at Posted at 2018-10-15

実装(Start-job,Wait-job,Remove-Jobを使う)


# 第一引数に実行するスクリプトブロック、第二引数に処理の上限数を受け取る関数「counting-semaphore」
# 第二引数がない場合は処理上限数は10となる
function counting-semaphore ([scriptblock]${scriptbl},${number}=10) { 

	# カウント用変数のインクリメント
	$script:counting++

	# カウント用変数が上限数に達した場合、処理終了を待つ
	switch ($script:counting) { 
		{$_ % ${number} -ne 0} {start-job $scriptbl -name "name$script:counting"}
		{$_ % ${number} -eq 0} {start-job $scriptbl -name "name$script:counting"
					for ($i=1;$i -le ${number};$i++) {
						wait-job   -name "name$i"
						remove-job -name "name$i"
					}
			$script:counting = 0
			}
	}	 
}

実行例


for ($i=1;$i -le 2;$i++) {
        counting-semaphore {echo $using:i} 1

}

Start-Jobについて
https://social.technet.microsoft.com/Forums/ja-JP/6451c2da-48b0-47f9-b620-2ee889974697/startjob-12398scriptblock?forum=powershellja

汎用化するなら重複しない名前を発行する仕組みが必要

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