optimize _wait_for_free_slot

cm.sh

@@ -354,6 +354,10 @@ function _update(){
 # "neverending" loop that waits until the current process is
 # the one with lowest PID
 function _wait_for_free_slot(){
+    if [ "$FREESLOT" = "1" ]; then
+        _debuglog "skip _wait_for_free_slot"
+        return 0
+    fi
     local _bWait=true
     _debuglog "start in _wait_for_free_slot"
     typeset -i local _iFirstPID=0
@@ -363,10 +367,10 @@ function _wait_for_free_slot(){
 	_wd "--- Need to wait until own process PID $$ is on top ... "
     while [ $_bWait = true ];
     do
-		_sProcesses=$( ps -ef | grep "bash.*$0" | grep -v "ssh.*@" | grep -v "grep" | sort -k 2 -n )
+		_sProcesses=$( ps aux | grep "bash.*$0" | grep -v "ssh.*@" | grep -v "grep" | sort -k 2 -n )
 		_iPos=$( echo "$_sProcesses" | grep -n " $$ " | head -1 | cut -f 1 -d ':' )
 
-		_wd "instances: $_iProcesses"
+        _wd "process $$ is on position $_iPos"
 		test ${CM_showdebug} -ne 0 && echo "$_sProcesses"
 
         # if [ $_iFirstPID -eq $$ ]; then
@@ -381,6 +385,7 @@ function _wait_for_free_slot(){
             sleep $((3 + RANDOM % 3));
         fi
     done
+    FREESLOT=1
     _debuglog "end _wait_for_free_slot"
 }