rom/exec/semaphores.h

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc:
   6     Lang:
   7 */
   8 #ifndef SEMAPHORES_H
   9 #define SEMAPHORES_H
  10
  11 #include <exec/tasks.h>
  12 #include <exec/nodes.h>
  13
  14 /* Signal flag to awake tasks waiting on a semaphore */
  15 #define SEMAPHORESIGF (0x8000)
  16
  17 /*
  18     Node for a task waiting synchronously:
  19     Maybe this shouldn't have a struct Node as first element - but I want
  20     it to be compatible to Procure()'s struct SemaphoreMessage.
  21     This means that ln_Name contains the lock type (SM_EXCLUSIVE or
  22     SM_SHARED). And since ln_Type is NT_MESSAGE for semaphore messages
  23     waiting on the semaphore list it isn't free either. The only field
  24     left in the node is ln_Pri which contains the node type (see below).
  25 */
  26 struct SemaphoreNode
  27 {
  28     struct Node node;
  29     struct Task *task;
  30 };
  31
  32 /* Node types in the semaphore's waiting queue */
  33 #define SN_TYPE_OBTAIN  0
  34 #define SN_TYPE_PROCURE 1
  35
  36 #endif