Defect Report #449

Submitter: Douglas Walls
Submission Date: 2013-08-24
Source: WG 14
Reference Document: N1744
Version: 1.1
Date: April 2014
Subject:What is the value of TSS_DTOR_ITERATIONS for implementations with no maximum?

Summary

Suggested Technical Corrigendum

Oct 2013 meeting

Committee Discussion

• The committee notes that existing practice in all cases has provided a small integer value for this definition.
• Allowing no restrictions is likely to break existing practice.

Committee Discussion

The question posed should be answered.

Proposed Committee Response

The standard intentionally does not define a value of TSS_DTOR_ITERATIONS for implementations with no maximum.

The TSS_DTOR_ITERATIONS macro is used to limit recursion at thread termination. The issue is that existing practice allows the creation of new tss bindings during the destructor call, and one destructor might reincarnate the original, thus forming an infinite recursive destructor loop. This loop may appear non-deterministically and is difficult to detect. The purpose of TSS_DTOR_ITERATIONS is as a bound to such recursion.

It is possible monitor the recursion depth with careful defensive programming and in those cases the value of TSS_DTOR_ITERATIONS is useful as that bound.

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