Delete in background and finally wait for children

ccollect

@@ -711,7 +711,7 @@ while [ "${source_no}" -lt "${no_sources}" ]; do
     if [ "$ret" -eq 0 ]; then
         _techo "Incomplete backups: $(echo $(cat "${TMP}"))"
         if [ -f "${c_delete_incomplete}" ]; then
-            delete_from_file "${TMP}" "${CMARKER}"
+            delete_from_file "${TMP}" "${CMARKER}" &
         fi
     fi
 
@@ -729,7 +729,7 @@ while [ "${source_no}" -lt "${no_sources}" ]; do
         ls -${TSORT}1r | grep "^${INTERVAL}\\." | head -n "${remove}" > "${TMP}" || \
                 _exit_err "Listing old backups failed"
 
-        delete_from_file "${TMP}"
+        delete_from_file "${TMP}" &
     fi
 
     #
@@ -820,6 +820,9 @@ while [ "${source_no}" -lt "${no_sources}" ]; do
     _techo "Backup lasted: ${hours}:${minutes}:${seconds} (h:m:s)"
 
     unlock "${name}"
+
+    # wait for children (doing delete_from_file) if any still running
+    wait
 ) || exit
 done