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### 1364. It is not clear how `exception_ptr` is synchronized

Section: 17.9.7 [propagation] Status: Resolved Submitter: Switzerland Opened: 2010-08-25 Last modified: 2016-01-28

Priority: Not Prioritized

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Discussion:

Addresses CH-19

It is not clear how `exception_ptr` is synchronized.

[ Resolution proposed by ballot comment ]

Make clear that accessing in different threads multiple `exception_ptr` objects that all refer to the same exception introduce a race.

[2011-03-08: Lawrence comments and drafts wording]

I think fundamentally, this issue is NAD, but clarification would not hurt.

> Proposed resolution

> Add a new paragraph to 17.9.7 [propagation] after paragraph 6 as follows:

> [Note: Exception objects have no synchronization requirements, and expressions using them may conflict (6.9.2 [intro.multithread]). — end note]

Proposed resolution:

Resolved 2011-03 Madrid meeting by paper N3278