home PDP-10 TOPS-20 Commands Reference Manual Top: Chapter 2 Command description

FREEZE

Halts execution of a fork.

Format

@FREEZE (FORK) fork

where:

fork is one of the following: Fork name
Fork number
Default - the current fork

Characteristics

Same Function as CTRL/C

The FREEZE command stops running background forks while you are at EXEC command level. The effect is the same as if you typed two CTRL/Cs while at the fork's program level.

Hints

More Information

The FREEZE command is one of the TOPS-20 multiforking-class commands. For more information about multiforking, see the section named, Running Multiple Programs, in the TOPS-20 User's Guide.

Related Commands

CONTINUE/BACKGROUND for continuing a halted fork in the background
INFORMATION FORK-STATUS for displaying the fork status
FORK, INFORMATION PROGRAM-STATUS, KEEP, RESET, SET NAME, SET PROGRAM, and UNKEEP other multiforking-class commands

Examples

  1. Give the FREEZE command to stop the current running background fork. Then, display the fork status. The arrow points to the current fork. 
    @FREEZE
@INFORMATION FORK-STATUS
 => BLISS (1): ^C from RUNNING at 500000, 0:00:13.1
    EDIT (2): Kept, HALT at 6254, 0:00:00.5
  2. Display the fork status and give the FREEZE command to stop a running background fork. Then, redisplay the fork status to check the result. 
    @INFORMATION FORK-STATUS
    BLISS (1): Background, RUNNING at 500000, 0:00:13.1
 => EDIT (2): Kept, HALT at 6254, 0:00:00.5
@FREEZE BLISS
@INFORMATION FORK-STATUS
    BLISS (1): ^C from RUNNING at 500000, 0:00:13.1
 => EDIT (2): Kept, HALT at 6254, 0:00:00.5