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Make embedding + V8 inspector work again #17254
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sgtm
I wouldn’t personally agree with rolling back 2728112. If we want ourselves or embedders to be able to run multiple isolates in a single process in some way, now or at some point in the future, then the default platform is not going to work for that because it doesn’t allow de-registering
Isolates.I would be happy to try whether your fix would work in Electron.
@zcbenz Can you describe in a few words what the ideal electron + node integration would look like? I remember you used to have trouble integrating with the libuv event loop. Perhaps we can work out something better now.
If you want something a little less open-ended: who should sit at the bottom of the call stack, node or electron? Who should call
uv_run()?@bnoordhuis I'll try to rephrase my issue.
I'm using v8::platform::CreateDefaultPlatform in embedding and it requires link to v8_libplatform.lib. I get this v8_libplatform.lib by building nodejs v9.0.0. If I upgrade node to 9.1.0, the addon will fail to work since I need to build a new v8_libplatform again.
I'm not sure if this is the right way of doing this./cc @nodejs/v8
@zcbenz Can you describe in a few words what the ideal electron + node integration would look like? I remember you used to have trouble integrating with the libuv event loop. Perhaps we can work out something better now.
Basically we create a new thread to watch events of the backend fd of the uv loop, when there is a new event, we would notify the main thread and call
uv_run_oncein the main thread.A simplified version of node integration can be found at https://github.com/yue/yode/blob/master/src/node_integration.cc.
@bnoordhuis Hi, any news on this topic (bring PumpMessageLoop back)?
@levimm Not at the moment. I don't have time to work on it myself but I can mentor and review pull requests, if you like.
@bnoordhuisI would love to work on. can you please elaborate on this regarding what are the changes that have to be made
@juggernaut451 Are you embedding Node.js? This issue probably isn't relevant to you if you aren't and hard to explain succinctly because of domain-specific knowledge.
Should this remain open?
I don't think so, I'll close.
See #16981 (comment).
Commit 9e08695 removed all
v8::platform::PumpMessageLoop()calls from the code base.It's problematic for embedders like electron that plug in their own
v8::Platformbecause they now no longer get notifications from the V8 inspector.We should probably restore the
PumpMessageLoop()calls, even if they're no-ops in normal node builds.