subsys/win32k/objects/semaphor.c

   1
   2 #undef WIN32_LEAN_AND_MEAN
   3 #include <windows.h>
   4 #include <stdlib.h>
   5 #include <win32k/bitmaps.h>
   6 #include <win32k/debug.h>
   7 #include <win32k/debug1.h>
   8 #include <debug.h>
   9 #include <ddk/winddi.h>
  10 #include "../eng/objects.h"
  11 #include <include/error.h>
  12
  13 /*
  14  * @implemented
  15  */
  16 HSEMAPHORE
  17 STDCALL
  18 EngCreateSemaphore ( VOID )
  19 {
  20   // www.osr.com/ddk/graphics/gdifncs_95lz.htm
  21   PERESOURCE psem = ExAllocatePool ( NonPagedPool, sizeof(ERESOURCE) );
  22   if ( !psem )
  23     return NULL;
  24   if ( !NT_SUCCESS(ExInitializeResourceLite ( psem )) )
  25   {
  26     ExFreePool ( psem );
  27     return NULL;
  28   }
  29   return (HSEMAPHORE)psem;
  30 }
  31
  32 /*
  33  * @implemented
  34  */
  35 VOID
  36 STDCALL
  37 EngAcquireSemaphore ( IN HSEMAPHORE hsem )
  38 {
  39   // www.osr.com/ddk/graphics/gdifncs_14br.htm
  40   ASSERT(hsem);
  41   ExAcquireResourceExclusiveLite ( (PERESOURCE)hsem, TRUE );
  42 }
  43
  44 /*
  45  * @implemented
  46  */
  47 VOID
  48 STDCALL
  49 EngReleaseSemaphore ( IN HSEMAPHORE hsem )
  50 {
  51   // www.osr.com/ddk/graphics/gdifncs_5u3r.htm
  52   ASSERT(hsem);
  53   ExReleaseResourceLite ( (PERESOURCE)hsem );
  54 }
  55
  56 /*
  57  * @implemented
  58  */
  59 VOID
  60 STDCALL
  61 EngDeleteSemaphore ( IN HSEMAPHORE hsem )
  62 {
  63   // www.osr.com/ddk/graphics/gdifncs_13c7.htm
  64   ASSERT ( hsem );
  65   ExFreePool ( (PVOID)hsem );
  66 }
  67
  68 /*
  69  * @implemented
  70  */
  71 BOOL
  72 STDCALL
  73 EngIsSemaphoreOwned ( IN HSEMAPHORE hsem )
  74 {
  75   // www.osr.com/ddk/graphics/gdifncs_6wmf.htm
  76   ASSERT(hsem);
  77   return (((PERESOURCE)hsem)->ActiveCount > 0);
  78 }
  79
  80 /*
  81  * @implemented
  82  */
  83 BOOL
  84 STDCALL
  85 EngIsSemaphoreOwnedByCurrentThread ( IN HSEMAPHORE hsem )
  86 {
  87   // www.osr.com/ddk/graphics/gdifncs_9yxz.htm
  88   ASSERT(hsem);
  89   return ExIsResourceAcquiredExclusiveLite ( (PERESOURCE)hsem );
  90 }