Notifying all processes of state change?

[Chris Davis (EDGE)]

What is the preferred way to notify all chromium processes (gpu, utility, renderer, etc) of state change?  I would like to avoid wiring up multiple mojo interfaces to broadcast state change from the browser process.  I have a setting I need to communicate to all process types and want to avoid restarting the browser.

 

Thanks,

Chris

[Will Harris]

What kind of state change are you trying to notify these processes of?

Will

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[Chris Davis (EDGE)]

Just a simple Boolean state that each process needs to be updated with.

[Justin Schuh]

I think Will was asking for an example of a specific state change event that all processes should be notified of. I know I'm struggling to think of a case where e.g. a renderer and a utility process should ever be notified of the same event.

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[Chris Davis (EDGE)]

In my specific case for Edge we have a performance setting which turns off high resolution timers.  We currently communicate this to renderers via the renderer preferences but I would also want this updated in utility processes and the gpu process.

[Bruce Dawson]

Currently all processes listen for power notifications and disable high-resolution timers when switching to battery power. Are you wiring up a user-visible setting to control this?

[Chris Davis (EDGE)]

Yes, this would be a user setting.

[dan...@chromium.org]

Gpu process has its own version of preferences:

https://source.chromium.org/chromium/chromium/src/+/main:gpu/config/gpu_preferences.h;drc=cb580043a19c2a161d47fc29507dd9bfca2db2f3;l=59

Not sure if utility processes have one too.

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[Dave Tapuska]

Would https://source.chromium.org/chromium/chromium/src/+/main:content/common/child_process.mojom be helpful?

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