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Introduce feature to only allow initialization once. #447

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Nov 14, 2018
Merged

Introduce feature to only allow initialization once. #447

merged 1 commit into from
Nov 14, 2018

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paulrouget
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@paulrouget paulrouget commented Nov 14, 2018 •
edited by larsbergstrom
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See #22039

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jdm commented Nov 14, 2018

@bors-servo r+

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📌 Commit 2ccdca9 has been approved by jdm

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⌛ Testing commit 2ccdca9 with merge 5baf536...

bors-servo pushed a commit that referenced this pull request Nov 14, 2018
Auto merge of #447 - paulrouget:initonce, r=jdm
5baf536 
Introduce feature to only allow initialization once.

See #22039

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CYBAI commented Nov 14, 2018

servo/servo#22039

(Just help to reference the issue correctly)

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CYBAI reviewed Nov 14, 2018
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Cargo.toml
@@ -2,7 +2,7 @@
name = "mozjs"
description = "Rust bindings to the Mozilla SpiderMonkey JavaScript engine."
repository = "https://github.com/servo/rust-mozjs"
version = "0.9.3"
version = "0.9.4"
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One thing I'm confused is that I've bumped the version to 0.9.4 at c16e7e2 but GitHub didn't show it 🤔

rust-mozjs/Cargo.toml

Line 5 in c16e7e2

version = "0.9.4"

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☀️ Test successful - status-appveyor, status-travis
Approved by: jdm
Pushing 5baf536 to master...

@bors-servo bors-servo merged commit 2ccdca9 into servo:master Nov 14, 2018
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@CYBAI I can't see the commits from PR #445

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CYBAI commented Nov 14, 2018

Hmm, @paulrouget can you see 9d5d8a9 in the PR?

Btw, mozjs on crates.io is already on 0.9.4 (https://crates.io/crates/mozjs). Not sure why GitHub didn't show the commit 🤔

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Can't see the commit here: https://github.com/servo/rust-mozjs/commits/master/Cargo.toml but I see it here: https://github.com/servo/rust-mozjs/commits/master

Anyway. Gonna bump to 0.9.5 and publish.

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nox commented Dec 8, 2018

Why not use std::sync::Once, and why is this feature only needed on Android in Servo? AFAIK SM should never be initialised multiple times, on all platforms, so I don't understand why this behaviour is enabled by a feature.

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nox commented Dec 8, 2018

Cc @asajeffrey, who reverted most of 066b4ab when he updated to SM 60 in #430.

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nox commented Dec 8, 2018

From SpiderMonkey's own documentation:

It is currently not possible to initialize SpiderMonkey multiple times (that is, calling JS_Init, JSAPI methods, then JS_ShutDown in that order, then doing so again). This restriction may eventually be lifted.

JS_Init should never be called multiple times, so this shouldn't be a feature at all.

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jdm commented Dec 8, 2018

It is specific to the way that we're using Servo inside Firefox Reality. The feature simply prevents us from calling shut down; it doesn't actually change how many times we initialize the library.

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Hmm, might be worth finding another name for the feature? It seems to be more about shutdown than init, perhaps never_shutdown would be better?

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jdm commented Dec 10, 2018

I have an open pull request that removes it entirely.

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