# Jsoo: postMessage, read back, conditions for safely doing so

**URL:** <https://discuss.ocaml.org/t/jsoo-postmessage-read-back-conditions-for-safely-doing-so/12500>\
**Category:** Learning\
**Created:** [June 28, 2023, 5:06pm UTC](https://discuss.ocaml.org/t/jsoo-postmessage-read-back-conditions-for-safely-doing-so/12500 "2023-06-28T17:06:34Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![dbuenzli](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ocaml.org/dbuenzli/32/18_2.png) [@dbuenzli](https://discuss.ocaml.org/u/dbuenzli)\
**Post date:** [June 28, 2023, 6:23pm UTC](https://discuss.ocaml.org/t/jsoo-postmessage-read-back-conditions-for-safely-doing-so/12500/4 "2023-06-28T18:23:49Z")

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> [@zeroexcuses](#):
>
> Did you ever solve this ? It was not clear to me from the followups whether you solved it.

Yes, see [this message](https://discuss.ocaml.org/t/js-of-ocaml-ocamls-values-and-the-structured-clone-algorithm/10615/14). Basically I had a stub “`nil`” value against which I was _physically_ testing. You can’t do that in this setting your “`nil`” will get different addresses in each “process”.

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_[View the full topic](https://discuss.ocaml.org/t/jsoo-postmessage-read-back-conditions-for-safely-doing-so/12500)._