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