When I need to disable the interrupt , I call CLI instead of cli? but how is the racing condition avoided? _________________________________________________________ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com --- [rtl] --- To unsubscribe: echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] ---- For more information on Real-Time Linux see: http://www.rtlinux.org/~rtlinux/