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  1. /*++
  2.  
  3. Copyright (c) 1998  Intel Corporation
  4.  
  5. Module Name:
  6.  
  7.     lock.c
  8.  
  9. Abstract:
  10.  
  11.     Implements FLOCK
  12.  
  13.  
  14.  
  15. Revision History
  16.  
  17. --*/
  18.  
  19.  
  20. #include "lib.h"
  21.  
  22.  
  23.  
  24. #pragma RUNTIME_CODE(RtAcquireLock)
  25. VOID
  26. RtAcquireLock (
  27.     IN FLOCK    *Lock
  28.     )
  29. /*++
  30.  
  31. Routine Description:
  32.  
  33.     Raising to the task priority level of the mutual exclusion
  34.     lock, and then acquires ownership of the lock.
  35.    
  36. Arguments:
  37.  
  38.     Lock        - The lock to acquire
  39.    
  40. Returns:
  41.  
  42.     Lock owned
  43.  
  44. --*/
  45. {
  46.     if (BS) {
  47.         if (BS->RaiseTPL != NULL) {
  48.             Lock->OwnerTpl = BS->RaiseTPL(Lock->Tpl);
  49.         }
  50.     }
  51.     else {
  52.         if (LibRuntimeRaiseTPL != NULL) {
  53.             Lock->OwnerTpl = LibRuntimeRaiseTPL(Lock->Tpl);
  54.         }
  55.     }
  56.     Lock->Lock += 1;
  57.     ASSERT (Lock->Lock == 1);
  58. }
  59.  
  60.  
  61. #pragma RUNTIME_CODE(RtAcquireLock)
  62. VOID
  63. RtReleaseLock (
  64.     IN FLOCK    *Lock
  65.     )
  66. /*++
  67.  
  68. Routine Description:
  69.  
  70.     Releases ownership of the mutual exclusion lock, and
  71.     restores the previous task priority level.
  72.    
  73. Arguments:
  74.  
  75.     Lock        - The lock to release
  76.    
  77. Returns:
  78.  
  79.     Lock unowned
  80.  
  81. --*/
  82. {
  83.     EFI_TPL     Tpl;
  84.  
  85.     Tpl = Lock->OwnerTpl;
  86.     ASSERT(Lock->Lock == 1);
  87.     Lock->Lock -= 1;
  88.     if (BS) {
  89.         if (BS->RestoreTPL != NULL) {
  90.             BS->RestoreTPL (Tpl);
  91.         }
  92.     }
  93.     else {
  94.         if (LibRuntimeRestoreTPL != NULL) {
  95.             LibRuntimeRestoreTPL(Tpl);
  96.         }
  97.     }
  98. }
  99.