[GTK] Add API to set the maximum number of web processes per WebKitWebContext

• Component: WebKitGTK
• Status: RESOLVED FIXED

[Carlos Garcia Campos]

This is useful for limited resources systems.

[Carlos Garcia Campos]

Created attachment 257090 [details]
Patch

[Martin Robinson]

Comment on attachment 257090 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=257090&action=review

> Source/WebKit2/UIProcess/API/gtk/WebKitWebContext.cpp:1208
> + * This method **must be called before any other functions**,
> + * as early as possible in your application. Calling it later will make
> + * your application crash.

Woh, isn't there a way to prevent this crash at all? Can't we guard the contents of the method call somehow?

[Michael Catanzaro]

The crash is good; it prevents programmers from screwing up and calling it too late. This isn't the only place we do that (I think for set process model, for example).

[Martin Robinson]

(In reply to comment #3)
> The crash is good; it prevents programmers from screwing up and calling it
> too late. This isn't the only place we do that (I think for set process
> model, for example).

How about a warning or a GLib failure though?

[Michael Catanzaro]

I guess

"This method **must be called before any other functions**, as early as possible in your application. Calling it later will make your application crash."

is not quite right; it implies you cannot use both webkit_web_context_set_process_model and this function, since the documentation is the same on both functions. Can you not use the function on a non-default WebKitWebContext? And of course you must call a function to get the WebKitWebContext in the first place.

[Carlos Garcia Campos]

(In reply to comment #3)
> The crash is good; it prevents programmers from screwing up and calling it
> too late. This isn't the only place we do that (I think for set process
> model, for example).

Right, we (WebProcessPool actually) has some CRASH calls in setProcessModel and setMaximumNumberOfProcesses. We can prevent this by making process model and web process count limit construct-only properties, but that makes the API less convenient and doesn't allow to change them for the default context.

[Carlos Garcia Campos]

(In reply to comment #5)
> I guess
> 
> "This method **must be called before any other functions**, as early as
> possible in your application. Calling it later will make your application
> crash."
> 
> is not quite right; it implies you cannot use both
> webkit_web_context_set_process_model and this function, since the
> documentation is the same on both functions. Can you not use the function on
> a non-default WebKitWebContext? And of course you must call a function to
> get the WebKitWebContext in the first place.

I agree the documentation is not accurate

[Carlos Garcia Campos]

Created attachment 257257 [details]
Updated patch

Updated the docs

[Carlos Garcia Campos]

ping

[Gustavo Noronha (kov)]

Comment on attachment 257257 [details]
Updated patch

I am not so sure about the word 'count', but I did not manage to come up with a suggestion either, so it looks good to me.

[Carlos Garcia Campos]

Committed r187543: <http://trac.webkit.org/changeset/187543>