On Wed, 28 Nov 2007 16:21:16 EST "(IBM Mainframe Discussion List)" <[EMAIL PROTECTED]> wrote:
:>Timer "pops" can be disabled in the new PSW's system mask when the PSW is :>swapped and the FLIH starts to run. But you cannot mask off restart, machine, :>or program interrupts. All FLIHs must be able to withstand being interrupted :>by such events. SVC interrupts are effectively masked off by not coding any :>in the FLIH. Machine interrupts can be masked off, but can lead to a check stop. Program has to mask off everything until it saves its status. SVC need not mask off anything, but probably does to handle the case of disabled callers - and enables quickly if it determines that the caller was enabled. IO need not block off external, nor external block off IO, but at least one needs to temporarily block off the other to avoid a race and a loss of an interrupt. -- Binyamin Dissen <[EMAIL PROTECTED]> http://www.dissensoftware.com Director, Dissen Software, Bar & Grill - Israel Should you use the mailblocks package and expect a response from me, you should preauthorize the dissensoftware.com domain. I very rarely bother responding to challenge/response systems, especially those from irresponsible companies. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
