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GuruMeditation
Docs » Include » libraries » realtime.h / .i
#ifndef LIBRARIES_REALTIME_H
#define LIBRARIES_REALTIME_H
/*
**	$VER: realtime.h 40.3 (5.4.1993)
**	Includes Release 45.1
**
**	realtime.library timing and syncing system
**
**	(C) Copyright 1993-2001 Amiga, Inc.
**	All Rights Reserved
*/

/*****************************************************************************/


#ifndef EXEC_TYPES_H
#include <exec/types.h>
#endif

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

#ifndef EXEC_LIBRARIES_H
#include <exec/libraries.h>
#endif

#ifndef UTILITY_TAGITEM_H
#include <utility/tagitem.h>
#endif

#ifndef UTILITY_HOOKS_H
#include <utility/hooks.h>
#endif


/*****************************************************************************/


/* realtime.library's idea of time is based on a clock which emits a pulse
 * 1200 times a second (1.2kHz). All time values maintained by realtime.library
 * are based on this number. For example, the field RealTimeBase->rtb_Time
 * expresses an amount of time equivalent to (RealTimeBase->rtb_Time/TICK_FREQ)
 * seconds.
 */
#define TICK_FREQ 1200


/*****************************************************************************/


/* Each Conductor represents a group of applications which wish to remain
 * synchronized together.
 *
 * This structure must only be allocated by realtime.library and is
 * READ-ONLY!
 */
struct Conductor
{
    struct Node    cdt_Link;
    UWORD	   cdt_Reserved0;
    struct MinList cdt_Players;		 /* this conductor's players	  */
    ULONG	   cdt_ClockTime;	 /* current time of this sequence */
    ULONG	   cdt_StartTime;	 /* start time of this sequence   */
    ULONG	   cdt_ExternalTime;	 /* time from external unit	  */
    ULONG	   cdt_MaxExternalTime;  /* upper limit on sync'd time	  */
    ULONG	   cdt_Metronome;	 /* MetricTime highest pri node   */
    UWORD	   cdt_Reserved1;
    UWORD	   cdt_Flags;		 /* conductor flags		  */
    UBYTE	   cdt_State;		 /* playing or stopped		  */
};

/* Flag bits for Conductor.cdt_Flags */
#define CONDUCTF_EXTERNAL (1<<0)   /* clock is externally driven */
#define CONDUCTF_GOTTICK  (1<<1)   /* received 1st external tick */
#define CONDUCTF_METROSET (1<<2)   /* cdt_Metronome filled in	 */
#define CONDUCTF_PRIVATE  (1<<3)   /* conductor is private	 */

#define CONDUCTB_EXTERNAL 0
#define CONDUCTB_GOTTICK  1
#define CONDUCTB_METROSET 2
#define CONDUCTB_PRIVATE  3

/* constants for Conductor.cdt_State and SetConductorState() */
#define CONDSTATE_STOPPED     0	  /* clock is stopped		   */
#define CONDSTATE_PAUSED      1	  /* clock is paused		   */
#define CONDSTATE_LOCATE      2	  /* go to 'running' when ready    */
#define CONDSTATE_RUNNING     3	  /* run clock NOW		   */

/* These do not actually exist as Conductor states, but are used as additional
 * arguments to SetConductorState()
 */
#define CONDSTATE_METRIC     -1	  /* ask high node to locate	   */
#define CONDSTATE_SHUTTLE    -2	  /* time changing but not running */
#define CONDSTATE_LOCATE_SET -3	  /* maestro done locating	   */


/*****************************************************************************/


/* The Player is the connection between a Conductor and an application.
 *
 * This structure must only be allocated by realtime.library and is
 * READ-ONLY!
 */
struct Player
{
    struct Node       pl_Link;
    BYTE	      pl_Reserved0;
    BYTE	      pl_Reserved1;
    struct Hook      *pl_Hook;		 /* player's hook function	 */
    struct Conductor *pl_Source;	 /* pointer to parent context	 */
    struct Task      *pl_Task;		 /* task to signal for alarm	 */
    LONG	      pl_MetricTime;	 /* current time in app's metric */
    LONG	      pl_AlarmTime;	 /* time to wake up		 */
    void	     *pl_UserData;	 /* for application use	 */
    UWORD	      pl_PlayerID;	 /* for application use	 */
    UWORD	      pl_Flags;	 /* general Player flags	 */
};

/* Flag bits for Player.pl_Flags */
#define PLAYERF_READY	  (1<<0)   /* player is ready to go!	    */
#define PLAYERF_ALARMSET  (1<<1)   /* alarm is set		    */
#define PLAYERF_QUIET	  (1<<2)   /* a dummy player, used for sync */
#define PLAYERF_CONDUCTED (1<<3)   /* give me metered time	    */
#define PLAYERF_EXTSYNC   (1<<4)   /* granted external sync	    */

#define PLAYERB_READY	  0
#define PLAYERB_ALARMSET  1
#define PLAYERB_QUIET	  2
#define PLAYERB_CONDUCTED 3
#define PLAYERB_EXTSYNC   4


/*****************************************************************************/


/* Tags for CreatePlayer(), SetPlayerAttrs(), and GetPlayerAttrs() */
#define PLAYER_Base	    (TAG_USER+64)
#define PLAYER_Hook	    (PLAYER_Base+1)   /* set address of hook function */
#define PLAYER_Name	    (PLAYER_Base+2)   /* name of player	      */
#define PLAYER_Priority     (PLAYER_Base+3)   /* priority of player	      */
#define PLAYER_Conductor    (PLAYER_Base+4)   /* set conductor for player     */
#define PLAYER_Ready	    (PLAYER_Base+5)   /* the "ready" flag	      */
#define PLAYER_AlarmTime    (PLAYER_Base+12)  /* alarm time (sets PLAYERF_ALARMSET) */
#define PLAYER_Alarm	    (PLAYER_Base+13)  /* sets/clears PLAYERF_ALARMSET flag  */
#define PLAYER_AlarmSigTask (PLAYER_Base+6)   /* task to signal for alarm/notify    */
#define PLAYER_AlarmSigBit  (PLAYER_Base+8)   /* signal bit for alarm (or -1) */
#define PLAYER_Conducted    (PLAYER_Base+7)   /* sets/clears PLAYERF_CONDUCTED flag   */
#define PLAYER_Quiet	    (PLAYER_Base+9)   /* don't process time thru this */
#define PLAYER_UserData     (PLAYER_Base+10)
#define PLAYER_ID	    (PLAYER_Base+11)
#define PLAYER_ExtSync	    (PLAYER_Base+14)  /* attempt/release to ext sync  */
#define PLAYER_ErrorCode    (PLAYER_Base+15)  /* error return value	      */


/*****************************************************************************/


/* Method types for messages sent via a Player's hook */
#define PM_TICK     0
#define PM_STATE    1
#define PM_POSITION 2
#define PM_SHUTTLE  3

/* used for PM_TICK, PM_POSITION and PM_SHUTTLE methods */
struct pmTime
{
    ULONG pmt_Method;	     /* PM_TICK, PM_POSITION, or PM_SHUTTLE */
    ULONG pmt_Time;
};

/* used for the PM_STATE method */
struct pmState
{
    ULONG pms_Method;	     /* PM_STATE */
    ULONG pms_OldState;
};


/*****************************************************************************/


/* Possible lock types for LockRealTime() */
#define RT_CONDUCTORS 0   /* conductor list */


/*****************************************************************************/


/* realtime.library error codes */
#define RTE_NOMEMORY	801   /* memory allocation failed      */
#define RTE_NOCONDUCTOR 802   /* player needs a conductor      */
#define RTE_NOTIMER	803   /* timer (CIA) allocation failed */
#define RTE_PLAYING	804   /* can't shuttle while playing   */


/*****************************************************************************/


/* OpenLibrary("realtime.library",0) returns a pointer to this structure.
 * All fields are READ-ONLY.
 */
struct RealTimeBase
{
    struct Library rtb_LibNode;
    UBYTE	   rtb_Reserved0[2];

    ULONG	   rtb_Time;	     /* current time			     */
    ULONG	   rtb_TimeFrac;     /* fixed-point fraction part of time    */
    UWORD	   rtb_Reserved1;
    WORD	   rtb_TickErr;      /* nanosecond error from ideal Tick     */
};				     /* length to real tick length	     */

/* Actual tick length is: 1/TICK_FREQ + rtb_TickErr/1e9 */

#define RealTime_TickErr_Min -705
#define RealTime_TickErr_Max  705


/*****************************************************************************/


#endif /* LIBRARIES_REALTIME_H */

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