#!/bin/sh
declare -i MAXTHREADS=4

declare -i JOBS=100
declare -i THREADS

endproc() {
        [ -f $1 ] && rm $1
        exit 0
}
jobproc() {
echo "Testproc: $THREADS"
        jobproc_end(){
                [ -f $1 ] && rm $1
                exit 0
        }
        if [ $SHELL~="bash" ]
                then MYPID="$BASHPID"
                else MYPID="$(sh -c 'echo $PPID')"
        fi
        echo "$MYPID" >> $1
        chmod -x $1

        local -i TIME="$(echo $RANDOM | head -c 1)"
        sleep $TIME     # Job activity imitation

        if [ -f $1 ]; then
                while [ -x $1 ]; do sleep 0.1; done
                chmod +x $1
                TMPPIDLIST=$(mktemp -u $TMPDIR/prlzr-$$-XXXXXXXX)
                trap "jobproc_end \$TMPPIDLIST" INT
                cat $1 | grep -v "$MYPID" > $TMPPIDLIST
                cat $TMPPIDLIST > $1
                chmod -x $1
                jobproc_end $TMPPIDLIST
        fi
}

gettmpfs() {
local TMPFS
local TMPDIR
case "$(uname)" in
        SunOS)  TMPFS=swap;;
        *)      TMPFS=tmpfs;;
esac

local TMPDIR_RAWLIST="$(mount | grep $TMPFS)"
if [ -n "$TMPDIR_RAWLIST" ]; then
        if [ -n "$(echo $TMPDIR_RAWLIST | grep '/dev/shm')" ]; then
                TMPDIR=/dev/shm
        else
                TMPDIR=$(echo $TMPDIR_RAWLIST | head -n 1 | cut -d ' ' -f 1);
        fi
fi
echo "$TMPDIR"
}

TMPDIR=$(gettmpfs)
if [ -z $TMPDIR ]; then TMPDIR=/tmp; fi
FLOCK=$(mktemp -u $TMPDIR/prlzr-$$-XXXX)
trap "endproc \$FLOCK" INT
touch $FLOCK; chmod -x $FLOCK

while [ $JOBS -gt 0 ]; do
        echo "While begin: $THREADS"
        while [ -x $FLOCK ]; do sleep 0.1; done
        chmod +x $FLOCK
        THREADS=$(wc -l $FLOCK | cut -d ' ' -f 1)
        chmod -x $FLOCK
        if [ $THREADS -lt $MAXTHREADS ]; then
                echo "If begin: $THREADS"
                chmod +x $FLOCK
                jobproc $FLOCK &
                while [ -x $FLOCK ]; do sleep 0.1; done
                JOBS=$JOBS-1
                echo "Jobs: $JOBS"
                echo "If end: $THREADS"
        else
                sleep 0.1;
        fi
        echo "While end: $THREADS"
done

endproc $FLOCK