FORTRAN Reference Manual

Statements
FORTRAN Reference Manual—528615-001
7-101
START BACKUP Statement
Table 7-9. Option Bits for START BACKUP OPTION Specifier
Bit Option
0-5 Reserved; must be zero.
6 If ENV OLD, bit 6 must be zero.
If ENV COMMON, bit 6 specifies whether START BACKUP should
checkpoint the extended stack when a backup process is created.
0 Do not checkpoint when starting the backup.
1 Checkpoint when starting the backup.
7 Specifies whether to maintain an outstanding NOWAIT read operation on
$RECEIVE:
0 Maintain a read.
1 Do not maintain a read.
8 Reserved; must be zero.
9 Specifies FORTRAN action if your program successfully executes an OPEN
statement but the system cannot open the same file in the backup process:
0 The primary closes the file.
1 The primary stops the backup process.
For more information, see the “CHECKOPEN Procedure” if you compile your
program with ENV OLD, or the “FILE_OPEN_CHKPT_” procedure if you
compile your program with ENV COMMON, both in the Guardian Procedure
Calls Reference Manual.
10 Specifies how FORTRAN handles a “bad checkpoint parameter” error on
CHECKPOINT:
0 The primary ABENDs.
1 FORTRAN returns an error code to the FORTRAN program.
11 Specifies when to recreate a backup process after a takeover: 0 At the next
CHECKPOINT statement. 1 Immediately.
12 Reserved; must be zero.
13 Specifies the disposition of the backup if the primary is stopped by a TACL
STOP command or a programmatic call to the STOP or PROCESS_STOP_
system procedure:
0 The backup stops also.
1 The backup becomes the primary and attempts to create a new backup
(this feature is useful for testing).
14 Reserved; must be zero.
15 Reserved; must be zero.
Note: Following the standard HP convention, bit positions are numbered 0 to 15 from left to right within a 16-bit
word.