>>So in other words STNSM AREA,X'FC' before >That affects the PSW of the CPU your code is running on; it doesn't >disable or lock any other CPU.
True. But it does not need to. Disablement of "your" CPU is the serialization that is required. >And STOSM AREA,X'03'. After <fixing typo> This presumes that you were enabled for both interrupt types before the STNSM. If you know that that is true, then this is fine. If it might be false, then this could be catastrophic to the system. An executed STOSM using the value saved on the STNSM (or an IF-test that uses X'03' if the saved mask was X'03' and does an executed STOSM if not) is the fully safe method. Be sure that your code and all your data are page-fixed if you are going to disable. Peter Relson z/OS Core Technology Design ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
