Library.c

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#include "DxeMain.h"
 
//
// Lock Stuff
//
 
EFI_STATUS
CoreAcquireLockOrFail (
  IN EFI_LOCK  *Lock
  )
{
  ASSERT (Lock != NULL);
  ASSERT (Lock->Lock != EfiLockUninitialized);
 
  if (Lock->Lock == EfiLockAcquired) {
    //
    // Lock is already owned, so bail out
    //
    return EFI_ACCESS_DENIED;
  }
 
  Lock->OwnerTpl = CoreRaiseTpl (Lock->Tpl);
 
  Lock->Lock = EfiLockAcquired;
  return EFI_SUCCESS;
}
 
VOID
CoreAcquireLock (
  IN EFI_LOCK  *Lock
  )
{
  ASSERT (Lock != NULL);
  ASSERT (Lock->Lock == EfiLockReleased);
 
  Lock->OwnerTpl = CoreRaiseTpl (Lock->Tpl);
  Lock->Lock     = EfiLockAcquired;
}
 
VOID
CoreReleaseLock (
  IN EFI_LOCK  *Lock
  )
{
  EFI_TPL  Tpl;
 
  ASSERT (Lock != NULL);
  ASSERT (Lock->Lock == EfiLockAcquired);
 
  Tpl = Lock->OwnerTpl;
 
  Lock->Lock = EfiLockReleased;
 
  CoreRestoreTpl (Tpl);
}