Tcl_SetRecursionLimit - set maximum allowable nesting depth in interpreter

       Tcl_Interp *interp (in)          Interpreter  whose  recursion  limit is to be set.  Must be greater than
                                        zero.

       Tcl_Size depth (in)              New limit for nested calls to Tcl_Eval for interp.
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       At any given time Tcl enforces a limit on the number of recursive calls that may be active  for  Tcl_Eval
       and  related procedures such as Tcl_EvalEx.  Any call to Tcl_Eval that exceeds this depth is aborted with
       an error.  By default the recursion limit is 1000.

       Tcl_SetRecursionLimit may be used to change the maximum allowable nesting depth for an interpreter.   The
       depth  argument  specifies  a  new limit for interp, and Tcl_SetRecursionLimit returns the old limit.  To
       read out the old limit without modifying it, invoke Tcl_SetRecursionLimit with depth equal to 0.

       The Tcl_SetRecursionLimit only sets the size of the Tcl call stack:  it cannot by  itself  prevent  stack
       overflows on the C stack being used by the application.  If your machine has a limit on the size of the C
       stack,  you  may  get  stack  overflows  before reaching the limit set by Tcl_SetRecursionLimit.  If this
       happens, see if there is a mechanism in your system for increasing the maximum size of the C stack.

       nesting depth, recursion

Tcl                                                    7.0                           Tcl_SetRecursionLimit(3tcl)

       Tcl_SetRecursionLimit - set maximum allowable nesting depth in interpreter

#include<tcl.h>

       Tcl_Size
       Tcl_SetRecursionLimit(interp,depth)