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Re: GNUstep and valgrind


From: Andreas Fink
Subject: Re: GNUstep and valgrind
Date: Tue, 20 Mar 2018 08:11:58 +0100

You never call "release" on a autorelease pool.
you call "drain" to empty it.


        NSAutoreleasePool  *arp=[[NSAutoreleasePool alloc]init];
...
        [arp drain];


would be more or less the same as

@autoreleasepool {
...
}



> On 20 Mar 2018, at 08:08, H. Nikolaus Schaller <address@hidden> wrote:
> 
> 
>> Am 20.03.2018 um 07:31 schrieb amon <address@hidden>:
>> 
>> Richard:
>> 
>> Thanks. I will look at that.
>> 
>> And btw, to the person who suggested @autorelease... I was
>> certain it would not compile, but I tried it anyway. Needless
>> to say, it did not compile.
>> 
>> I did try coding
>> p=[NSAutoreleasePool new]; do something; [p release];
>> and in some cases it seemed to help. In others it did not.
>> I'll be digging deeper tomorrow and I will give the macros
>> you suggested a try.
> 
> Well, there may be this pattern:
> 
> while(YES) {
>       arp=[NSAutoreleasePool new];
>       object = do something
>       var=[object retain]
>       [arp release]
> }
> 
> Then, the object will leak despite using an ARP and releasing it.
> The issue is that var=[object retain] will *not* release the previous
> var. That is what the ASSIGN macro would be good for.
> 
> Unfortunately I also don't have a clear method to track down such
> issues especially if they are distributed over multiple frameworks.
> 
>> 
>> If nothing else, I am getting a much better handle on how and
>> when memory gets sucked up.
>> 
>> A question on NSHost then. If NSHost essentially returns a
>> cache of something like what NeXT used to call Class Objects,
>> like the old Printer Class that always returned the same
>> object (A technique I still use for something btw)
> 
> this is the Singleton Pattern: https://en.wikipedia.org/wiki/Singleton_pattern
> 
>> then that
>> would be less troubling.
>> But to be clear, If I create an NSHost
>> for "10.0.0.1" in one place in the code, and then some entirely
>> other area creates one with the same IP, I presume you are
>> seeing that it will return a pointer to the same object? That
>> there will never be two NSHosts with the same IP?
> 
> You can find out by running
> 
>       NSLog(@"%p", [NSHost hostWithAddress:@"10.0.0.1"]);
> 
> twice in succession.
> 
> 
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