Parallel run via batch file

gistfile1.bat

echo "Arg 1 is"%1%
echo "Arg 2 is"%2%

IF "%1"=="" (
echo "Argument: browser was not set"
exit -1
)
IF "%2"=="" (
	echo "Argument: N of executors was not set. 2 or 4 are supported"
	set FORKS="4"
) else ( 
	set FORKS="%2"
)

del "*lock*"
set "lock=.\wait%random%.lock"

if %FORKS%=="4" (

	:: Launch asynchronously, with stream 9 redirected to a lock file.
	:: The lock file will remain locked until the script ends.
	start "" cmd /c 9>"%lock%1" mvn integration-test -Dsuite="Suite1" -Dbrowser=%1%
	start "" cmd /c 9>"%lock%2" mvn integration-test -Dsuite="Suite2" -Dbrowser=%1%
	start "" cmd /c 9>"%lock%3" mvn integration-test -Dsuite="Suite3" -Dbrowser=%1%
	start "" cmd /c 9>"%lock%4" mvn integration-test -Dsuite="Suite4" -Dbrowser=%1%
	
	:Wait4 for both scripts to finish (wait until lock files are no longer locked)
	1>nul 2>nul ping /n 2 ::1

	for %%N in (1 2 3 4) do (
	  ( rem
	  ) 9>"%lock%%%N" || goto :Wait4
	) 2>nul

	echo %ERRORLEVEL%
	::delete the lock files
	del "%lock%*"
)

if %FORKS%=="2" (

	:: Launch one and two asynchronously, with stream 9 redirected to a lock file.
	:: The lock file will remain locked until the script ends.
	start "" cmd /c 9>"%lock%1" mvn integration-test -Dsuite="SuiteFirst" -Dbrowser=%1%
	start "" cmd /c 9>"%lock%2" mvn integration-test -Dsuite="SuiteSecond" -Dbrowser=%1%
	
	:Wait2 for both scripts to finish (wait until lock files are no longer locked)
	1>nul 2>nul ping /n 2 ::1
	for %%N in (1 2) do (
	  ( rem
	  ) 9>"%lock%%%N" || goto :Wait2
	) 2>nul

	echo %ERRORLEVEL%
	::delete the lock files
	del "*lock*"
)