This is different from what you're asking, but would
Mmap.mmap(Mmap.Anonymous(), type, dims, offset)
work for you?
--Tim
On Thursday, March 31, 2016 08:21:31 PM Lee Bates wrote:
> Hi,
>
> I'm creating a Julia type that conatins a Mmapped Vector. The intention is
> that the binary file behind the Mmap vector is created when the type is
> initialised and the file is deleted when the gc knows it's out out of
> scope. I'm using a finalizer function to achieve the deletion.
>
> My code is below. The code works during the Julia session (deleting files
> when they are out of scope) but files are not being deleted when the Julia
> session is closed.
>
> For example,
>
> tmp=MmapVectorInt(50,Int[])
> tmp=MmapVectorInt(50,Int[])
> tmp1=MmapVectorInt(50,Int[])
> tmp2=MmapVectorInt(50,Int[])
> tmp2=MmapVectorInt(50,Int[])
> gc()
>
> Works fine, deleting the file linked to the first tmp and first tmp2.
>
> However, when I end this Julia session only 2 of the 3 remaining files are
> deleted.
>
> There seems to be an inconsistency with how Julia finalizes objects within
> a Julia session and at the end of a session. Can someone explain this or
> offer an alternative approach?
> I'm using the 64 bit Windows version of Julia.
>
> Thanks
> Lee
>
>
> function genbinaryfilename()
> sleep(0.001)
> return split(string(time()),'.')[2]*".bin"
> end
>
> type MmapVectorInt
> #vector length
> vlen::Int
> #storage array
> vec::Vector{Int}
> #mmap file
> mmapfile::ASCIIString
> function MmapVectorInt(vlen::Int,vec::Vector{Int})
> # Generate MMap file
> mmapfile=genbinaryfilename()
> s = open(mmapfile, "w+")
> tmp=Array(Int,vlen)
> write(s,tmp)
> close(s)
>
> # Reopen MMap file
> s = open(mmapfile, "r+")
> vec1 = Mmap.mmap(s, Vector{Int}, (vlen,))
> close(s)
>
> #copy contents from function to vector
> vec1[1:min(vlen,length(vec))]=deepcopy(vec[1:min(vlen,length(vec))])
> #create the instance
> x = new(vlen,Int[],mmapfile)
> #point the vector to the mmapped vector
> x.vec=vec1
> #add the finalizer function
> finalizer(x,DestroyMmapVectorInt)
> #return x
> x
> end
> end
>
> function DestroyMmapVectorInt(x::MmapVectorInt)
> #finalize the mmapped vector. (unlinks the file)
> finalize(x.vec)
> if x.mmapfile!=""
> #delete the file
> rm(x.mmapfile)
> end
> end
