Re: prevent multiple instances of a program
Re: prevent multiple instances of a program
- Subject: Re: prevent multiple instances of a program
- From: Tito Ciuro <email@hidden>
- Date: Wed, 11 May 2011 18:15:37 -0300
Hi Martin,
One way to do it is via flock():
http://developer.apple.com/library/mac/#documentation/darwin/reference/manpages/man2/flock.2.html
-- Tito
On May 11, 2011, at 6:04 PM, Dave DeLong wrote:
> There are a bunch of ways to do this, but the general principle is that when an instance of the app starts, it makes its presence known somehow (touching a file, broadcasting a distributed notification, vending a distributed object, etc). Then when a second instance starts, it tries to find a previous instance (looking for the file, broadcasting a distributed notification and waiting for a response, connecting to a distributed object, etc). If it finds one, it kills itself.
>
> Dave
>
> On May 11, 2011, at 2:02 PM, Martin Batholdy wrote:
>
>> Hi,
>>
>> My program consists of a menu item and is NSUIagent - so it is hidden in the Mac OS app-bar.
>>
>> Now what surprises me is that I am able to open several instances of this program.
>> Every time I click on the app-file a new symbol appears and I have a new instance of my program running.
>>
>> How can I prevent this?
>> (so that system-wide you can only have one instance of the program running)
>>
>> Is there a build-option in xCode for this?
>>
>>
>> thanks!_______________________________________________
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