ntoskrnl/ps/idle.c

   1 /*
   2  * COPYRIGHT:       See COPYING in the top level directory
   3  * PROJECT:         ReactOS kernel
   4  * FILE:            ntoskrnl/ps/idle.c
   5  * PURPOSE:         Using idle time
   6  * PROGRAMMER:      David Welch (welch@cwcom.net)
   7  * UPDATE HISTORY:
   8  *                  Created 22/05/98
   9  */
  10
  11 /* INCLUDES *****************************************************************/
  12
  13 #include <ddk/ntddk.h>
  14 #include <internal/ke.h>
  15 #include <internal/ps.h>
  16
  17 #define NDEBUG
  18 #include <internal/debug.h>
  19
  20 /* GLOBALS *******************************************************************/
  21
  22 HANDLE PsIdleThreadHandle = NULL;
  23 extern ULONG DpcQueueSize;
  24 PETHREAD PiIdleThread;
  25
  26 /* FUNCTIONS *****************************************************************/
  27
  28 NTSTATUS STDCALL
  29 PsIdleThreadMain(PVOID Context)
  30 {
  31    KIRQL oldlvl;
  32
  33    for(;;)
  34      {
  35        if (DpcQueueSize > 0)
  36          {
  37            KeRaiseIrql(DISPATCH_LEVEL,&oldlvl);
  38            KiDispatchInterrupt();
  39            KeLowerIrql(oldlvl);
  40          }
  41        NtYieldExecution();
  42        __asm__( "hlt" );
  43      }
  44 }
  45
  46 VOID PsInitIdleThread(VOID)
  47 {
  48    KPRIORITY Priority;
  49    ULONG Affinity;
  50
  51    PsCreateSystemThread(&PsIdleThreadHandle,
  52                         THREAD_ALL_ACCESS,
  53                         NULL,
  54                         NULL,
  55                         NULL,
  56                         PsIdleThreadMain,
  57                         NULL);
  58
  59    Priority = LOW_PRIORITY;
  60    NtSetInformationThread(PsIdleThreadHandle,
  61                           ThreadPriority,
  62                           &Priority,
  63                           sizeof(Priority));
  64    Affinity = 1 << 0;
  65    NtSetInformationThread(PsIdleThreadHandle,
  66                           ThreadAffinityMask,
  67                           &Affinity,
  68                           sizeof(Affinity));
  69 }