[so] [SO][Tema2][Windows] Problema sincronizare fisier

[Cosmin Stefan-Dobrin]

Are cineva totusi vreo idee? Flag-urile par ok?

Thanks,
Cosmin


2011/4/23 Cosmin Stefan-Dobrin <cosminstefanxp at gmail.com>

> Salut,
>
> Asa cum spune si titlul, am o mica problema cu sincronizarea datelor in
> fisierul de ram (functia w_sync_mapping). Mai exact, la testul 22,
> test_mapping_write_is_carried_through_to_file, in apelul w_sync_mapping,
> functia FlushViewOfFile imi iese cu eroare. Mai jos sa gaseste outputul meu:
>
>
> ============================================================================
> Z:\so\tema3\win>vmsim_test 22
> [LIB][DEBUG] Page SIZE: 65536
> [LIB][DEBUG] Init finished.
> [LIB][DEBUG] Creating new allocation of 10 pages and 4 frames.
> [LIB][DEBUG]    VirtualAlloc (reserve) returned 00350000.
> [LIB][DEBUG]    Virtual memory mapping successful at address: '00350000'.
> [LIB][DEBUG]    Created '.\swp361.tmp' swap file.
> [LIB][DEBUG]    Created '.\ram362.tmp' ram file.
> [LIB][DEBUG]    Page Table and Frame Table initialization complete.
> [LIB][DEBUG] Alloc complete.
> [TESTER][DEBUG] exception address: 004029B0
> [LIB][DEBUG] Page Fault Handler triggered at address '00352EE5'.
> [LIB][DEBUG]    Page 0 starting at 00350000 (Dirty 0, Prot 2, State 2) on
> allocation starting at 00350000.
> [LIB][DEBUG]    Page not alloc'ed. Alloc'ing on frame '0'.
> [LIB][DEBUG]    Alloc'ing on frame 0 with previous page table association
> 00000000.
> [LIB][DEBUG]            Ret Val: 00350000; Page Start: 00350000; 0
> [LIB][DEBUG]    Page cleaning...
> [LIB][DEBUG]            Ret Val: 00350000; Page Start: 00350000; 0
> [LIB][DEBUG]    Page mapped on ram on frame 0.
> [LIB][DEBUG] Page Handler FINISHED.
> [TESTER][DEBUG] exception address: 004029B0
> [LIB][DEBUG] Page Fault Handler triggered at address '00352EE5'.
> [LIB][DEBUG]    Page 0 starting at 00350000 (Dirty 0, Prot 0, State 0) on
> allocation starting at 00350000.
> [LIB][DEBUG]    Page in RAM. Changing protection to RW.
> [LIB][DEBUG]    Old file mapping unmapped. Mapping with new rights on same
> frame 0...
> [LIB][DEBUG]            Ret Val: 00350000; Page Start: 00350000; 0
> [LIB][DEBUG] Page Handler FINISHED.
> [TESTER][DEBUG] After write, in memory: 18
> EroareWSync: Attempt to access invalid address.
> [TESTER][DEBUG] Found 0; Should've been: 18
> [TESTER][DEBUG] Found 0; Should've been: 18
> [TESTER][DEBUG] Found 0; Should've been: 18
> [TESTER][DEBUG] Found 0; Should've been: 18
> test_mapping_write_is_carried_through_to_file...............failed  [
> 0/100]
>
> ============================================================================
>
> Dupa cum se observa, in ultima portiune, FlushViewOfFile imi iese cu
> eroarea Attempt to access invalid address. Daca in apelul w_sync_mapping din
> functia de test pun 1 (sa imi flush-uiasca __doar prima pagina__), testul
> trece cu brio. Deci evident e o problema cand acel flush intra peste
> paginile care sunt mapate in memorie (VirtualAlloc), dupa pagina mapata
> peste fisier.
>
> Si ca o scurta descriere a ce am facut in cod, initial am mapat (ca in
> exemplu), granular, fiecare pagina virtuala cu flagurile:
> VirtualAlloc(  addr, page_size, MEM_RESERVE | MEM_COMMIT, PAGE_NOACCESS);
>
> si apoi, la maparea fisierului ram, realizez VirtualFree, Creez un
> FileMapping cu flagurile:
> CreateFileMapping(  file_handle,    NULL,   (DWORD) PAGE_READWRITE,  0, 0,
> NULL);
>
> si mapez fisierul:
> MapViewOfFileEx(  mHandle,  desired_access,    0,
> file_page_no*page_size,   page_size, address);
>
> Am pus flagurile mai sus pentru ca probabil e o problema la alocare sau
> mapare.
>
> Thanks for your help!
>
> Sarbatori fericite,
> Cosmin
>
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