reactos/drivers/wdm/audio/backpln/stdunk/stdunk.c

   1 /*
   2     "Unknown" implementation, in C
   3     by Andrew Greenwood
   4
   5     Not quite sure how this is used, but the C++ variant is intended for
   6     implementing a NonDelegatingUnknown object
   7 */
   8
   9 #include <stdunk.h>
  10
  11 STDMETHODCALLTYPE
  12 NTSTATUS
  13 Unknown_QueryInterface(
  14     IUnknown* this,
  15     IN  REFIID refiid,
  16     OUT PVOID* output)
  17 {
  18     /* TODO */
  19     return STATUS_SUCCESS;
  20 }
  21
  22 STDMETHODCALLTYPE
  23 ULONG
  24 Unknown_AddRef(
  25     IUnknown* unknown_this)
  26 {
  27     struct CUnknown* this = CONTAINING_RECORD(unknown_this, struct CUnknown, IUnknown);
  28
  29     InterlockedIncrement(&this->m_ref_count);
  30     return this->m_ref_count;
  31 }
  32
  33 STDMETHODCALLTYPE
  34 ULONG
  35 Unknown_Release(
  36     IUnknown* unknown_this)
  37 {
  38     struct CUnknown* this = CONTAINING_RECORD(unknown_this, struct CUnknown, IUnknown);
  39
  40     InterlockedDecrement(&this->m_ref_count);
  41
  42     if ( this->m_ref_count == 0 )
  43     {
  44         ExFreePool(this);
  45         return 0;
  46     }
  47
  48     return this->m_ref_count;
  49 }
  50
  51
  52 /*
  53     The vtable for Unknown
  54 */
  55
  56 const IUnknownVtbl UnknownVtbl =
  57 {
  58     Unknown_QueryInterface,
  59     Unknown_AddRef,
  60     Unknown_Release
  61 };
  62