This is why I am starting to loathe programming
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It's like the blind leading the blind.... http://stackoverflow.com/questions/2926869/c-do-you-need-to-dispose-of-objects-and-set-them-to-null/2926877#2926877[^] I think I will get similar responses from here too though :sigh:
xacc.ide
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((λ (x) `(,x ',x)) '(λ (x) `(,x ',x))) The Scheme Programming Language – Fourth Edition -
It's like the blind leading the blind.... http://stackoverflow.com/questions/2926869/c-do-you-need-to-dispose-of-objects-and-set-them-to-null/2926877#2926877[^] I think I will get similar responses from here too though :sigh:
xacc.ide
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((λ (x) `(,x ',x)) '(λ (x) `(,x ',x))) The Scheme Programming Language – Fourth EditionWell, I don't use "using" a lot, and I generally dispose and set to null when I'm done with an object. The GC also doesn't handle objects on the large heap.
.45 ACP - because shooting twice is just silly
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"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
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"The staggering layers of obscenity in your statement make it a work of art on so many levels." - J. Jystad, 2001 -
It's like the blind leading the blind.... http://stackoverflow.com/questions/2926869/c-do-you-need-to-dispose-of-objects-and-set-them-to-null/2926877#2926877[^] I think I will get similar responses from here too though :sigh:
xacc.ide
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((λ (x) `(,x ',x)) '(λ (x) `(,x ',x))) The Scheme Programming Language – Fourth EditionSome people in the C# forum once informed me that not using "using" could lead to memory leaks due to the way .Net manages memory. They say that, because unmanaged resources are outside of the memory tracked by .Net, that memory can grow very large without triggering a garbage collection by .Net. So, maybe you have some objects with finalizers and such that make it the least often collected object. And maybe you only have a few of them and they don't take up much managed memory in .Net. However, they could still reference a ton of unmanaged memory, and .Net does not count that large amount of unmanaged memory when deciding whether or not to perform a garbage collection. That can lead to the memory growing out of hand... perhaps too far out of hand before .Net decides to do a garbage collection. Not sure if that's correct, but that's about what I think they were trying to convey to me.
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Well, I don't use "using" a lot, and I generally dispose and set to null when I'm done with an object. The GC also doesn't handle objects on the large heap.
.45 ACP - because shooting twice is just silly
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"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
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"The staggering layers of obscenity in your statement make it a work of art on so many levels." - J. Jystad, 2001John Simmons / outlaw programmer wrote:
The GC also doesn't handle objects on the large heap.
It does, but in a different way. The large object heap can suffer from fragmentation that causes it to grow beyond what it is actually being used to store, but objects on the LOH still get collected, eventually. I can't remember the details at the moment (I think the framgentation problem is because LOH objects aren't shifted about... they can never move from one position in the LOH to another position in the LOH, because moving large objects is a costly operation), but the GC does "handle" the LOH objects in the sense that they get collected automatically.
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Some people in the C# forum once informed me that not using "using" could lead to memory leaks due to the way .Net manages memory. They say that, because unmanaged resources are outside of the memory tracked by .Net, that memory can grow very large without triggering a garbage collection by .Net. So, maybe you have some objects with finalizers and such that make it the least often collected object. And maybe you only have a few of them and they don't take up much managed memory in .Net. However, they could still reference a ton of unmanaged memory, and .Net does not count that large amount of unmanaged memory when deciding whether or not to perform a garbage collection. That can lead to the memory growing out of hand... perhaps too far out of hand before .Net decides to do a garbage collection. Not sure if that's correct, but that's about what I think they were trying to convey to me.
The ratio of unmanaged memory to managed memory is pretty much insignificant, in 95%+ cases. Anyways, there are classes to inform the CLR about this, if it is excessive.
xacc.ide
IronScheme - 1.0 RC 1 - out now!
((λ (x) `(,x ',x)) '(λ (x) `(,x ',x))) The Scheme Programming Language – Fourth Edition -
It's like the blind leading the blind.... http://stackoverflow.com/questions/2926869/c-do-you-need-to-dispose-of-objects-and-set-them-to-null/2926877#2926877[^] I think I will get similar responses from here too though :sigh:
xacc.ide
IronScheme - 1.0 RC 1 - out now!
((λ (x) `(,x ',x)) '(λ (x) `(,x ',x))) The Scheme Programming Language – Fourth EditionIt's a bad idea to not dispose
IDisposableobjects. But the reasons given there are incorrect, it does not lead to memory leaks. But it does lead to excessive resource usage and potentially even to resource exhaustion (whereresource != memory). Yeah and I don't visit StackOverflow anymore for this reason - popular myths get upvoted, correct answers usually get ignored. -
It's like the blind leading the blind.... http://stackoverflow.com/questions/2926869/c-do-you-need-to-dispose-of-objects-and-set-them-to-null/2926877#2926877[^] I think I will get similar responses from here too though :sigh:
xacc.ide
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((λ (x) `(,x ',x)) '(λ (x) `(,x ',x))) The Scheme Programming Language – Fourth EditionI think I can avoid a downvote or two, on my way now. :cool:
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It's a bad idea to not dispose
IDisposableobjects. But the reasons given there are incorrect, it does not lead to memory leaks. But it does lead to excessive resource usage and potentially even to resource exhaustion (whereresource != memory). Yeah and I don't visit StackOverflow anymore for this reason - popular myths get upvoted, correct answers usually get ignored.Daniel Grunwald wrote:
But it does lead to excessive resource usage and potentially even to resource exhaustion (where resource != memory).
That was my point too.
Daniel Grunwald wrote:
It's a bad idea to not dispose IDisposable objects.
I know you should, but you dont have to, unless you want it to be deterministic.
xacc.ide
IronScheme - 1.0 RC 1 - out now!
((λ (x) `(,x ',x)) '(λ (x) `(,x ',x))) The Scheme Programming Language – Fourth Edition -
It's like the blind leading the blind.... http://stackoverflow.com/questions/2926869/c-do-you-need-to-dispose-of-objects-and-set-them-to-null/2926877#2926877[^] I think I will get similar responses from here too though :sigh:
xacc.ide
IronScheme - 1.0 RC 1 - out now!
((λ (x) `(,x ',x)) '(λ (x) `(,x ',x))) The Scheme Programming Language – Fourth Edition -
SO WHERE IS YOUR UNMANAGED RESOURCE?
Agh! Reality! My Archnemesis![^]
| FoldWithUs! | sighist | µLaunch - program launcher for server core and hyper-v server.peterchen wrote:
SO WHERE IS YOUR UNMANAGED RESOURCE?
if it was managed I'd know where it was, but my management of my resources (e.g. cash) is notoriously bad. I'd make a good accountant, but no great fund manager.
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Daniel Grunwald wrote:
But it does lead to excessive resource usage and potentially even to resource exhaustion (where resource != memory).
That was my point too.
Daniel Grunwald wrote:
It's a bad idea to not dispose IDisposable objects.
I know you should, but you dont have to, unless you want it to be deterministic.
xacc.ide
IronScheme - 1.0 RC 1 - out now!
((λ (x) `(,x ',x)) '(λ (x) `(,x ',x))) The Scheme Programming Language – Fourth EditionBy implementing IDisposable, the class creator explicitely told you to call
Dispose(). If the documentation of a class said "You need to call Init() before using an instance of this class", would you reply with "Ah, I don#t feel like it today"?Agh! Reality! My Archnemesis![^]
| FoldWithUs! | sighist | µLaunch - program launcher for server core and hyper-v server. -
By implementing IDisposable, the class creator explicitely told you to call
Dispose(). If the documentation of a class said "You need to call Init() before using an instance of this class", would you reply with "Ah, I don#t feel like it today"?Agh! Reality! My Archnemesis![^]
| FoldWithUs! | sighist | µLaunch - program launcher for server core and hyper-v server.peterchen wrote:
the class creator explicitely told you to call Dispose().
No, he actually said: 'If you want to cleanup the resources immediately, then call Dispose(), but if you forget or dont want to, I'll do it anyways when the object finalizer is called.'
xacc.ide
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((λ (x) `(,x ',x)) '(λ (x) `(,x ',x))) The Scheme Programming Language – Fourth Edition -
John Simmons / outlaw programmer wrote:
The GC also doesn't handle objects on the large heap.
It does, but in a different way. The large object heap can suffer from fragmentation that causes it to grow beyond what it is actually being used to store, but objects on the LOH still get collected, eventually. I can't remember the details at the moment (I think the framgentation problem is because LOH objects aren't shifted about... they can never move from one position in the LOH to another position in the LOH, because moving large objects is a costly operation), but the GC does "handle" the LOH objects in the sense that they get collected automatically.
yep, the difference is the move cost is high, therefore moves are avoided and that results in a fragmentation risk. But it isn't as black-and-white as it used to be; I have "frag demonstration code" that used to always work long ago (i.e. reach an intended out of memory situation easily), and more recently fails; I've never seen an improvement in LOH treadment documented though. :)
Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]
I only read formatted code with indentation, so please use PRE tags for code snippets.
I'm not participating in frackin' Q&A, so if you want my opinion, ask away in a real forum (or on my profile page).
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It's like the blind leading the blind.... http://stackoverflow.com/questions/2926869/c-do-you-need-to-dispose-of-objects-and-set-them-to-null/2926877#2926877[^] I think I will get similar responses from here too though :sigh:
xacc.ide
IronScheme - 1.0 RC 1 - out now!
((λ (x) `(,x ',x)) '(λ (x) `(,x ',x))) The Scheme Programming Language – Fourth Editionleppie wrote:
I think I will get similar responses from here too though
I for one would set you straight if you were to publish such statements in one of CP's programming forums. :|
Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]
I only read formatted code with indentation, so please use PRE tags for code snippets.
I'm not participating in frackin' Q&A, so if you want my opinion, ask away in a real forum (or on my profile page).
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It's like the blind leading the blind.... http://stackoverflow.com/questions/2926869/c-do-you-need-to-dispose-of-objects-and-set-them-to-null/2926877#2926877[^] I think I will get similar responses from here too though :sigh:
xacc.ide
IronScheme - 1.0 RC 1 - out now!
((λ (x) `(,x ',x)) '(λ (x) `(,x ',x))) The Scheme Programming Language – Fourth Edition -
peterchen wrote:
the class creator explicitely told you to call Dispose().
No, he actually said: 'If you want to cleanup the resources immediately, then call Dispose(), but if you forget or dont want to, I'll do it anyways when the object finalizer is called.'
xacc.ide
IronScheme - 1.0 RC 1 - out now!
((λ (x) `(,x ',x)) '(λ (x) `(,x ',x))) The Scheme Programming Language – Fourth EditionHear hear! I implement IDisposable on a lot of classes that don't really need it, because the
usingpattern is so good at letting the reader clearly see the lifetime of an instance. I dislike finding that a class I want to use can't be used in ausingstatement. In my opinion,objectshould have a virtual do-nothing Dispose method so that any class or struct can be used with theusingstatement. (We would therefore not need the IDisposable interface.) -
Hear hear! I implement IDisposable on a lot of classes that don't really need it, because the
usingpattern is so good at letting the reader clearly see the lifetime of an instance. I dislike finding that a class I want to use can't be used in ausingstatement. In my opinion,objectshould have a virtual do-nothing Dispose method so that any class or struct can be used with theusingstatement. (We would therefore not need the IDisposable interface.)PIEBALDconsult wrote:
In my opinion, object should have a virtual do-nothing Dispose method so that any class or struct can be used with the using statement. (We would therefore not need the IDisposable interface.)
For everybody, not just piebald: it's been well over 1.5 years since I wrote C# production code, so take my words with a large dose of scepticism. I agree with Piebald here. Any gurus care to explain why this isn't the case?
Cheers, Vikram. (Got my troika of CCCs!)
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peterchen wrote:
the class creator explicitely told you to call Dispose().
No, he actually said: 'If you want to cleanup the resources immediately, then call Dispose(), but if you forget or dont want to, I'll do it anyways when the object finalizer is called.'
xacc.ide
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((λ (x) `(,x ',x)) '(λ (x) `(,x ',x))) The Scheme Programming Language – Fourth Editionleppie wrote:
when
You misspelled "if". I just don't like the default of "your" rule. "Call Dispose unless you know what you are doing" would be ok. "Don't call Dispose unless, umm, you feel like it" is not. Also, Having to call Dispose may affect code structure, which means figuring out later you have to call it may require major changes. [edit] as an example: Omitting Disposal of a resource holdign a file handle: You: "It's ok, we can have zillions of open file handles in windows". Me: "The file handle may remain open forever. Even if the user closed the file, he can't move or modify it in another program - or instance of this program - because we still keep the file handle open. It's one of those completely unecessary, insanely annoying bugs."
Agh! Reality! My Archnemesis![^]
| FoldWithUs! | sighist | µLaunch - program launcher for server core and hyper-v server. -
PIEBALDconsult wrote:
In my opinion, object should have a virtual do-nothing Dispose method so that any class or struct can be used with the using statement. (We would therefore not need the IDisposable interface.)
For everybody, not just piebald: it's been well over 1.5 years since I wrote C# production code, so take my words with a large dose of scepticism. I agree with Piebald here. Any gurus care to explain why this isn't the case?
Cheers, Vikram. (Got my troika of CCCs!)
C# is a garbage collected language. If you want explicit memory management for all object, use C++.
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C# is a garbage collected language. If you want explicit memory management for all object, use C++.
Daniel Grunwald wrote:
C# is a garbage collected language
Exactly. It's not about memory management.