thank you
archana
On Fri, 6 Jun 2003, [utf-8] Arnaud Denoual wrote:
> hello
>
> you can obtain pointer only for value type, array or string. The first element of an
> array must to be a value type.
>
> Arnaud
>
>
> > in continuation with this,
> > is there any way of taking the address of a managed type,
> > like for example when i tried to compile similar code:
> >
> > class testobj {
> > public int y;
> > }
> >
> > class Foo {
> > public testobj x;
> > }
> >
> > unsafe class test {
> > public static void Main()
> > {
> > Foo foo=Foo();
> > fixed(testobj* f=&foo.x) {
> > ...
> >
> > }
> >
> >
> > }
> >
> >
> > }
> >
> > i got a compiler error "cannot take address of a managed type"
> > for the line having the fixed stmt (both on windows and Free BSD, rotor
> > Beta version)
> > am i missing something here?
> >
> > thanks,
> > archana
> >
> >
> > On Tue, 3 Jun 2003, Jan Kotas wrote:
> >
> > > Only variable z is marked as pinned. It is easy to see if you look at
> > > generated IL using ildasm.
> > >
> > > The pinned pointers will show up as interior pointers during the GC
> > > scan. For interior pointers, the GC uses bricktable to find the object
> > > that encapsulates the given memory location and then operates on that.
> > > If you want to see it in the code, look for GC_CALL_INTERIOR flag and
> > > what's done differently when it is set.
> > >
> > > So to answer your question, when a field in the object is pinned the
> > > whole object will be pinned. This will happen inside the GC through
> > > interior pointers. There does not have to be pinned variable holding
> > > reference to the object.
> > >
> > > -Jan
> > >
> > > This posting is provided "AS IS" with no warranties, and confers no
> > > rights.
> > >
> > > -----Original Message-----
> > > From: Discussion of the Rotor Shared Source CLI implementation
> > > [mailto:[EMAIL PROTECTED] On Behalf Of Archana
> > > Sent: Tuesday, January 05, 1999 10:01 AM
> > > To: [EMAIL PROTECTED]
> > > Subject: [DOTNET-ROTOR] pinning and fixed blocks
> > >
> > > Hi,
> > > this is regarding Pinning objects using fixed(..) {}
> > > If we have a piece of code like
> > > fixed (obj* z= & objx.field) {
> > > ...
> > > }
> > > How does rotor treat the variables z and obj,
> > > does it mark both as pinned?
> > > when it pins objx does it pin just the field or the entire object?
> > >
> > > regards
> > >
> >
> >
> >
>
> ------------------------------------------
>
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>
>
