This page is a snapshot from the LWG issues list, see the Library Active Issues List for more information and the meaning of C++11 status.

### 1480. Atomic fences don't have synchronizes with relation

Section: 33.5.11 [atomics.fences] Status: C++11 Submitter: BSI Opened: 2010-08-25 Last modified: 2016-01-28

Priority: Not Prioritized

View all other issues in [atomics.fences].

View all issues with C++11 status.

Discussion:

Addresses GB-137

Thread fence not only establish synchronizes with relationships, there are semantics of fences that are expressed not in terms of synchronizes with relationships (for example see 33.5.4 [atomics.order] p.5). These semantics also need to apply to the use of `atomic_signal_fence` in a restricted way.

[Batavia: Concurrency group discussed issue, and is OK with the proposed resolution.]

[2011-02-26 Reflector discussion]

Moved to Tentatively Ready after 5 votes.

Proposed resolution:

Change 33.5.11 [atomics.fences] p. 6 as indicated:

>     void atomic_signal_fence(memory_order);

> > 6 Effects: equivalent to `atomic_thread_fence(order)`, except that synchronizes with relationships the resulting ordering constraints are established only between a thread and a signal handler executed in the same thread.