Re: Do I have a looping issue?
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Dave,
Compare_and_swap is a non-privileged instruction.? But he's getting a protection exception. Now how is that possible?
If we look at his PSW ... 078D2000000383EC?
DAT is controlled by bit 5 in a EC mode PSW. He's got a 7 in the second nibble, so the DAT bit is on. Thus, DAT is on.? So, with DAT on, how is he getting a protection exception?
As Fish said early in this thread, "the program is running in Problem State with PSW Key 8 (the "8D" in your
PSW), but the storage the 'CS' (Compare and Swap) instruction is trying
to access is Key 0 (the '0' in "K:06")". That's how he's getting a protection exception.
Compare and swap is two registers and a memory location. Nothing requiring a supervisor?key...
What is a "supervisor key"? I know of no such thing in the S/370 architecture.
Tony H.?
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