Synchronization in work-stealing deque

[clef-men]

In src/ws_deque.ml, the tab field is not atomic, contrary to the reference implementation in relaxed memory (Correct and Efficient Work-Stealing for Weak Memory Models). Furthermore, there is no synchronization before writing to this field in push and pop_as. Therefore, in my understanding, there is no guarantee that the thieves do not read Obj.magic () (from realloc) when accessing tab in steal_as (same scenario as https://fzn.fr/readings/errata-ppopp207-le.txt).

Are you sure it is correct? Maybe it relies on a synchronization mechanism I am not aware of.

[lyrm]

Thanks for reporting this ! I will have a look.