Re: v3.0 release on hold - Mailing list pgadmin-hackers

Hi

On Thu, Mar 22, 2018 at 1:13 PM, Dave Page <dpage@pgadmin.org> wrote:

2) Starting a second instance of the app bundle on Mac doesn't always open a new pgAdmin window as it should. It works fine in the debugger, or if you start the app with a command like: "/Applications/pgAdmin\ 4.app/Contents/MacOS/pgAdmin4". It doesn't work if you double-click the appbundle or use a command like "open /Applications/pgAdmin\ 4.app"

  Still working on this, not found any solution yet.

         Not able to figure out the solution yet. I have tried to debug the code, but every time it will create a new instance(tray icon). Do I need to look into the code or something related to app bundle may be some settings in info.plist or any other pointer? 

Have a look at the code around line 85 an onwards of pgAdmin4.cpp. It creates the shared memory interlock (and log/address files) based on the current username and a hash of the executable name/path. My suspicion is that the path hash (which is calculated from argv[0] on line 72) is for some reason getting a different value each time when launched via the Finder or "open", thus the interlock is failing.

So I took a look at this, and it seems the code is just fine. What is happening is that macOS only allows a single instance of an app to run at once. Whilst that is what we want of course, macOS is causing the new instance to exit before it has a change to open a new pgAdmin window. Using "open -n ..." or calling the embedded executable directly resolves that issue.

So, there's another challenge to figure out... :-( 

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Dave Page
Blog: http://pgsnake.blogspot.com
Twitter: @pgsnake

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