Shell Programming and Scripting

I'm running cygwin bash on windows 7 and I'm have some bat files that perform large builds and take a long time and a lot of memory.

Therefor, I don't want to builds executing simultaneously (too much memory).

How can I implement a queue so I can queue up multiple builds and only execute one at a time?

Here is my attempt, but it does not quite work:

Code:

build.bat one &
a=$!
"wait $a ; build.bat two" &
b=$!
"wait $b ; build.bat three" &
c=$!
etc..

I want $b to contain the pid for the "build.bat two" -- how do I do that?
Now I know I could write a script file to call "build.bat one;build.bat two; build.bat three" but that assumes I know in advance that I want to execute "build.bat two" and not "build.bat four" after "build.bat one".

Thanks
Siegfried
Thanks
Siegfried

Hi,

This will work under linux, i don't have cygwin to check. You can't use wait in the script because you will have error msgs like

Code:

wait: pid 31718 is not a child of this shell

So i loop while the process exist.

Code:

function build
{
    echo "[$2] - Waiting for end of pid $1"
    while [ -e /proc/$1 ]; do
        sleep 0.1;
    done
    shift;
    ./build.sh $@
}

./build.sh one &
build $! two &
build $! three &
build $! four &
build $! five &

give this a shot:

script abc:

Code:

 for i in $@; do build $i; done

then call script with builds in the desired sequence:

Code:

abc one four two &