set maximum allowable nesting depth in interpreter 

Tcl Library Procedures


#include <tcl.h>

int Tcl_SetRecursionLimit(interp, depth)


Tcl_Interp *interp (in) 

Interpreter whose recursion limit is to be set. Must be greater than zero.

int depth (in) 

New limit for nested calls to Tcl_Eval() for interp.


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_GlobalEval(). 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.


Windows 8.1. Windows Server 2012 R2. Windows 10. Windows Server 2016. Windows Server 2019. Windows 11. Windows Server 2022.


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