Waiting for parallel batch scripts

Question

I have 4 batch files. I want to run one.bat and two.bat at once, concurrently. After completion of these two batch files, three.bat an

Answer 1

Create a master.bat file that starts one.bat and two.bat. When one.bat and two.bat end correctly, they echo to file they have finished

if errorlevel 0 echo ok>c:\temp\OKONE
if errorlevel 0 echo ok>c:\temp\OKTWO

Then the master.bat wait for the existence of the two files

del c:\temp\OKONE
del c:\temp\OKTWO
start one.bat
start two.bat
:waitloop
if not exist c:\temp\OKONE (
    sleep 5
    goto waitloop
    )
if not exist c:\temp\OKTWO (
    sleep 5
    goto waitloop
    )
start three.bat
start four.bat

Another way is to try with the /WAIT flag

start /WAIT one.bat
start /WAIT two.bat

but you don't have any control on errors.

Here's some references

http://malektips.com/xp_dos_0002.html

http://ss64.com/nt/sleep.html

http://ss64.com/nt/start.html

Answer 2

I had this same dilemma. Here's the way I solved this issue. I used the Tasklist command to monitor whether the process is still running or not:

:Loop
tasklist /fi "IMAGENAME eq <AAA>" /fi "Windowtitle eq <BBB>"|findstr /i /C:"<CCC>" >nul && (
timeout /t 3
GOTO :Loop
)
echo one.bat has stopped
pause

You'll need to tweak the

<AAA>, <BBB>, <CCC>

values in the script so that it's correctly filtering for your process.

Hope that helps.

Answer 3

This is easily done using a much simplified version of a solution I provided for Parallel execution of shell processes. Refer to that solution for an explanation of how the file locking works.

@echo off
setlocal
set "lock=%temp%\wait%random%.lock"

:: 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" one.bat
start "" cmd /c 9>"%lock%2" two.bat

:Wait 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 :Wait
) 2>nul

::delete the lock files
del "%lock%*"

:: Launch three and four asynchronously
start "" cmd /c three.bat
start "" cmd /c four.bat

Answer 4

Just adding another way, maybe the shortest.

(one.cmd | two.cmd) && (three.cmd | four.cmd)

Concept is really straight forward. Start one and 2 in paralel, once done and errorlevel is 0 run three and four.