Error with cache with two instances of CEF C++ application

[afgarcia]

Hello,

I have a CEF C++ application in Debian that launches with an external event and loads a web content that uses the browser local storage to read and write some data.

The problem comes when one instance of the application is running and other instance loads in the back and need to access this data, there are quite a few seconds where the browser content is black, the error I get is the next one:

[1027/122920.357660:WARNING:value_store_frontend.cc(44)] Reading mhjfbmdgcfjbbpaeojofohoefgiehjai.alarms from failed: IO error: .../LOCK: File currently in use. (ChromeMethodBFE: 15::LockFile::2)

When launching the app, I always set the cache directory to the same one for sharing data between the different processes and I always initialize CEF too.

Is there a way to share cache between processes without getting this concurrency error? Or maybe, checking if CEF is already initialized on the system in order to just launch a new window?

Thanks.

[magreenblatt]

Is there a way to share cache between processes without getting this concurrency error?

No, each main process instance requires its own cache.

Or maybe, checking if CEF is already initialized on the system in order to just launch a new window?

Yes, you can implement this approach in your application. See https://stackoverflow.com/questions/533 ... -in-c-or-c

[afgarcia]

Thanks for your reply,

I have a few questions with the approach you propossed. I understand the cache path to the new app instance is set to each CefInitialize process. Is the main process instance indicated on the running processes list as this?

user 3740 0.0 0.0 8704 884 ? S 11:18 0:00 /opt/Browser/chrome-sandbox

How could I set the cache path to the new app instance without doing the CefInitialize, so I can just create a new browser window?

I also saw that there is a function "CefCurrentlyOn()" that you could pass the variable "TID_UI" in order to check if cef is already running, does this still work, or its deprecated and now it uses "CEF_REQUIRE_UI_THREAD();"?

Thanks for your answers.

[KatrinaS]

I don't think you can (but I may be wrong), access to the Database / Folder(s) is locked, possibly to an instance. I detect instances of the helper.exe to find out if CEF is already running