HP 3000 Manuals HP 3000 Manuals
SWITCHDB
CM callable only.
Switches the DB register pointer. Privileged mode (PM) capability is
required.
Syntax
_____________________________________
| |
| U16 O-P U16V |
| logindex:=SWITCHDB(index) |
_____________________________________
Functional Return
logindex 16-bit unsigned integer (assigned functional
return)
Returns the logical index of the data segment
indicated by the previous DB register setting,
allowing this setting to be restored later. If the
previous DB setting indicated the stack, a zero is
returned.
Parameters
index 16-bit unsigned integer by value (required)
Passes the logical index of the data segment where
the DB register is to be switched (obtained through
the GETDSEG intrinsic). The value specified is
checked to ensure that the process has acquired
access to the segment previously. For an extra
data segment, a positive, nonzero integer must be
specified. To switch to the stack segment, a zero
must be specified.
Condition Codes
CCE (2) Request granted.
CCG (0) Not returned.
CCL (1) Request denied. An illegal data segment was
specified.
Related Information
Intrinsics GETDSEG
Commands None
Manuals Introduction to MPE XL for MPE V Programmers
(30367-90005)