Standard Library/break
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This script defines break utilities and is included in the J standard library. Definitions are loaded into the z locale.
setbreak 'default' is done by profile for Jqt. JHS and jconsole can use ctrl+c.
setbreak creates file ~break/Pid.Class and writes 0 to the first byte. Pid is the process id and Class is normally 'default'.
setbreak calls 9!:47 to map the first byte of the file. JE tests this byte for break requests. Another task writes 1 or 2 to the file for attention/break.
9!:46 returns the filename.
A new setbreak replaces the old. A non-default class protects JE from the default break.
break 0 displays breakhelp.
| break | v | break J execution |
| breakclean | v | erase orphan break files |
| breakhelp | n | break help |
| setbreak | v | set break file |