#ifndef EXEC_SEMAPHORES_H
#define EXEC_SEMAPHORES_H
/*
**      $VER: semaphores.h 39.1 (7.2.1992)
**      Includes Release 44.1
**
**      Definitions for locking functions.
**
**      (C) Copyright 1986-1999 Amiga, Inc.
**          All Rights Reserved
*/

#ifndef EXEC_NODES_H
#include <exec/nodes.h>
#endif /* EXEC_NODES_H */

#ifndef EXEC_LISTS_H
#include <exec/lists.h>
#endif /* EXEC_LISTS_H */

#ifndef EXEC_PORTS_H
#include <exec/ports.h>
#endif /* EXEC_PORTS_H */

#ifndef EXEC_TASKS_H
#include <exec/tasks.h>
#endif /* EXEC_TASKS_H */


/****** SignalSemaphore *********************************************/

/* Private structure used by ObtainSemaphore() */
struct SemaphoreRequest
{
        struct MinNode  sr_Link;
        struct Task     *sr_Waiter;
};

/* Signal Semaphore data structure */
struct SignalSemaphore
{
        struct Node             ss_Link;
        WORD                    ss_NestCount;
        struct MinList          ss_WaitQueue;
        struct SemaphoreRequest ss_MultipleLink;
        struct Task             *ss_Owner;
        WORD                    ss_QueueCount;
};

/****** Semaphore procure message (for use in V39 Procure/Vacate) ****/
struct SemaphoreMessage
{
        struct Message          ssm_Message;
        struct SignalSemaphore  *ssm_Semaphore;
};

#define SM_SHARED       (1L)
#define SM_EXCLUSIVE    (0L)

/****** Semaphore (Old Procure/Vacate type, not reliable) ***********/

struct Semaphore        /* Do not use these semaphores! */
{
        struct MsgPort  sm_MsgPort;
        WORD            sm_Bids;
};

#define sm_LockMsg mp_SigTask

#endif  /* EXEC_SEMAPHORES_H */