Simple File Lock Tester

filelocktester.ps1

function Test-FileLock ([string]$Path, [int]$TimeOutMs, [int]$Count) {
	$timeout = $TimeOutMs
	if ($timeout -lt 0) {$timeout = 0}
	if ($Count -gt 0) {$Count--} else {$Count = 0}
	do {
		try {
			$OFile = [System.IO.FileInfo]::new($Path)
			$OStream = $OFile.Open([System.IO.FileMode]::Open, [System.IO.FileAccess]::ReadWrite, [System.IO.FileShare]::None)
			if ($OStream) {$OStream.Close()}
			return $false
		} catch {
			if (-not $OFile.Length) {return $false} elseif (-not $timeout) {return $true}
		}
		if ($timeout) {Start-Sleep -Milliseconds $timeout; $timeout = 0}
		if ($Count -and $timeout -eq 0) {$timeout = $TimeOutMs; $Count--}
	} while ($timeout -gt 0)
	$true
} # END Test-FileLock