Submitter: Jens Gustedt
Submission Date: 2012-10-08
Reference Document: N1653
Date: April 2013
Subject: no specification for the access to variables with temporary lifetime
Section 6.2.4 in p4 and p5 requires implementation defined behavior for accessing objects with thread local or automatic storage from different threads than where they are defined. No such mention is done for objects with temporary lifetime in p8. Can they be accessed by other threads? Is this property handled similar to the property for automatic storage duration? Or should this simply be forbidden?
Suggested Technical Corrigendum
Add to the end of 6.2.4 p8:
The result of attempting to indirectly access an object with temporary lifetime from a thread other than the one with which the object is associated is implementation-defined.
Add to 7.26.1p3:
which expands to 1 if objects of temporary lifetime are visible to other threads and to 0 otherwise.
Proposed Committee Response
Objects with temporary lifetime are defined in 6.2.4 paragraph 8 to be those with automatic storage duration, and so inter-thread access is implementation defined. No change needed.
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