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GeneralRe: I thought .NET was supposed to make things easier, if anything, than unmanaged code. Pin
Stuart Dootson19-Sep-19 4:36
professionalStuart Dootson19-Sep-19 4:36 
GeneralRe: I thought .NET was supposed to make things easier, if anything, than unmanaged code. Pin
honey the codewitch19-Sep-19 4:37
memberhoney the codewitch19-Sep-19 4:37 
GeneralRe: I thought .NET was supposed to make things easier, if anything, than unmanaged code. Pin
Stuart Dootson19-Sep-19 4:47
professionalStuart Dootson19-Sep-19 4:47 
GeneralRe: I thought .NET was supposed to make things easier, if anything, than unmanaged code. Pin
honey the codewitch19-Sep-19 4:50
memberhoney the codewitch19-Sep-19 4:50 
GeneralRe: I thought .NET was supposed to make things easier, if anything, than unmanaged code. Pin
Steve Naidamast19-Sep-19 6:11
professionalSteve Naidamast19-Sep-19 6:11 
GeneralRe: I thought .NET was supposed to make things easier, if anything, than unmanaged code. Pin
honey the codewitch19-Sep-19 6:28
memberhoney the codewitch19-Sep-19 6:28 
GeneralRe: I thought .NET was supposed to make things easier, if anything, than unmanaged code. Pin
zezba900019-Sep-19 7:50
memberzezba900019-Sep-19 7:50 
GeneralRe: I thought .NET was supposed to make things easier, if anything, than unmanaged code. Pin
honey the codewitch19-Sep-19 7:53
memberhoney the codewitch19-Sep-19 7:53 
Nope, because you can't pin an object to a specific address in memory.

Ergo I can't back a .NET instance with a memory mapped file.

Memory mapped files work by mapping a portion of the process address space to your application.

So you can read and write the file doing pointer ops.

However, in .NET you can only get pointers to the GC heap by pinning objects.

So I cannot do

var arr = new int[100000000];// backed by memory mapped file


in any variation. Even if I were to pin the array to get the pointer, the pointer wouldn't be part of that mapped address space.

At best, I have to *copy* the entire object into that mapped region, which absolutely defeats the whole point of why I'd use mem mapped I/O here in the first place.

There's a half measure using Span, but it only works in Standard and Core, not the DNF
When I was growin' up, I was the smartest kid I knew. Maybe that was just because I didn't know that many kids. All I know is now I feel the opposite.

GeneralRe: I thought .NET was supposed to make things easier, if anything, than unmanaged code. Pin
zezba900019-Sep-19 8:06
memberzezba900019-Sep-19 8:06 
GeneralRe: I thought .NET was supposed to make things easier, if anything, than unmanaged code. Pin
honey the codewitch19-Sep-19 8:09
memberhoney the codewitch19-Sep-19 8:09 
GeneralRe: I thought .NET was supposed to make things easier, if anything, than unmanaged code. Pin
zezba900019-Sep-19 8:17
memberzezba900019-Sep-19 8:17 
GeneralRe: I thought .NET was supposed to make things easier, if anything, than unmanaged code. Pin
honey the codewitch19-Sep-19 8:17
memberhoney the codewitch19-Sep-19 8:17 
GeneralRe: I thought .NET was supposed to make things easier, if anything, than unmanaged code. Pin
zezba900019-Sep-19 8:20
memberzezba900019-Sep-19 8:20 
GeneralRe: I thought .NET was supposed to make things easier, if anything, than unmanaged code. Pin
honey the codewitch19-Sep-19 8:21
memberhoney the codewitch19-Sep-19 8:21 
GeneralRe: I thought .NET was supposed to make things easier, if anything, than unmanaged code. Pin
zezba900019-Sep-19 8:26
memberzezba900019-Sep-19 8:26 
GeneralRe: I thought .NET was supposed to make things easier, if anything, than unmanaged code. Pin
honey the codewitch19-Sep-19 8:28
memberhoney the codewitch19-Sep-19 8:28 
GeneralRe: I thought .NET was supposed to make things easier, if anything, than unmanaged code. Pin
zezba900019-Sep-19 8:35
memberzezba900019-Sep-19 8:35 
GeneralRe: I thought .NET was supposed to make things easier, if anything, than unmanaged code. Pin
honey the codewitch19-Sep-19 8:37
memberhoney the codewitch19-Sep-19 8:37 
GeneralRe: I thought .NET was supposed to make things easier, if anything, than unmanaged code. Pin
zezba900019-Sep-19 8:43
memberzezba900019-Sep-19 8:43 
GeneralRe: I thought .NET was supposed to make things easier, if anything, than unmanaged code. Pin
honey the codewitch19-Sep-19 8:51
memberhoney the codewitch19-Sep-19 8:51 
GeneralRe: I thought .NET was supposed to make things easier, if anything, than unmanaged code. Pin
zezba900019-Sep-19 9:01
memberzezba900019-Sep-19 9:01 
GeneralRe: I thought .NET was supposed to make things easier, if anything, than unmanaged code. Pin
honey the codewitch19-Sep-19 9:28
memberhoney the codewitch19-Sep-19 9:28 
GeneralRe: I thought .NET was supposed to make things easier, if anything, than unmanaged code. Pin
zezba900019-Sep-19 9:37
memberzezba900019-Sep-19 9:37 
GeneralRe: I thought .NET was supposed to make things easier, if anything, than unmanaged code. Pin
honey the codewitch19-Sep-19 9:41
memberhoney the codewitch19-Sep-19 9:41 
GeneralRe: I thought .NET was supposed to make things easier, if anything, than unmanaged code. Pin
zezba900019-Sep-19 10:05
memberzezba900019-Sep-19 10:05 

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