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State Indicator )SI {n} {-tid=tn}

This command displays the contents of the state indicator in the active workspace. The state indicator identifies those operations which are suspended or pendent for each suspension.

The optional parameter n specifies that only the first n or last ¯n lines of the output should be displayed.

The optional parameter -tid=tn specifies that the state indicator is to be displayed only for thread number tn.

The list consists of a line for each suspended or pendent operation beginning with the most recently suspended function or operator. Each line may be:

  • The name of a defined function or operator, followed by the line number at which the operation is halted, and followed by the * symbol if the operation is suspended. The name of the function or operator is its full pathname relative to the root namespace #. For example, #.UTIL.PRINT. In addition, the display of a function or operator which has dynamically changed space away from its origin is prefixed with its current space. For example, [⎕SE] TRAV.
  • A primitive operator symbol.
  • The Execute function symbol (⍎).
  • The Evaluated Input symbol (⎕).
  • The System Function ⎕DQ or ⎕SR (occurs when executing a callback function).

Examples

      )SI
#.PLUS[2]*
.
#.MATDIV[4]
#.FOO[1]*
⍎

This example indicates that at some point function FOO was executed and suspended on line 1. Subsequently, function MATDIV was invoked, with a function derived from the Inner Product or Outer Product operator (.) having defined function PLUS as an operand.

In the following, function foo in namespace x has called goo in namespace y. Function goo has then changed space (⎕CS) to namespace z where it has been suspended: 

      )SI
[z] y.goo[2]*
x.foo[1]

Threads

In a multi-threading application, where parent threads spawn child threads, the state indicator assumes the structure of a branching tree. Branches of the tree are represented by indenting lines belonging to child threads. For example: 

      )SI
·   #.Calc[1]
&5
·   ·   #.DivSub[1]
·   &7
·   ·   #.DivSub[1]
·   &6
·   #.Div[2]*
&4
#.Sub[3]
#.Main[4]

Here, Main has called Sub, which has spawned threads 4 and 5 with functions: Div and Calc. Function Div, after spawning DivSub in each of threads 6 and 7, has been suspended at line [2].

The state indicator for a particular thread tn may be displayed by specifying the parameter -tid=tn. 

       ⎕←foo&¨10 10 10 10
┌→─────────┐
│9 10 11 12│
└~─────────┘
       )si
·   #.foo[1]
&9
·   #.foo[1]
&10
·   #.foo[1]
&11
·   #.foo[1]
&12
      )si -tid=11
#.foo[1]