/*                                  MicrosecondTrap.h                               */

/*

 * MicrosecondTrap.h

 * Copyright © 1994 Apple Computer Inc. All rights reserved.

 */

#ifndef __MicrosecondTrap__

#define __MicrosecondTrap__

#include <Types.h>

#include <Traps.h>

#include <Timer.h>

/*

 * These definitions are needed for the Microsecond Trap only if you have not

 * upgraded to the Universal Headers.

 */

#ifndef __MIXEDMODE__

/*

 * MixedMode.h is defined for the Universal Headers. If it wasn't defined, we'll

 * define a 64-bit unsigned integer here.

 */

#if defined(powerc) || defined (__powerc)

#pragma options align=mac68k

#endif

struct UnsignedWide {

    unsigned long               hi;

    unsigned long               lo;

};

#if defined(powerc) || defined(__powerc)

#pragma options align=reset

#endif

typedef struct UnsignedWide UnsignedWide;

#endif /* __MIXEDMODE__ */

#ifndef __powerc

/*

 * This trap returns the number of microseconds, but is not yet defined in all public

 * headers. It is present on all systems that support the extended time manager..

 */

#ifndef _Microseconds

#define _Microseconds   0xA193

#pragma parameter Microseconds(__A1)

pascal void Microseconds(UnsignedWide *microsecondCount) =

  {0xA193, 0x225F, 0x22C8, 0x2280};

#endif  /* _Microseconds */

#endif  /* __powerc */

/*

 * TRUE if the Microsecond Trap is present.

 */

Boolean                     MicrosecondTrapPresent(void);

/*

 * Convert a Microsecond value to a double-precision number of microseconds.

 */

double                      MicrosecondToDouble(

        register const UnsignedWide *epochPtr

    );

/*

 * Return the difference between two Microsecond Trap values.

 * Integer subtraction is used to preserve accuracy.

 */

void

MicrosecondDelta(

        register const UnsignedWide *startPtr,

        register const UnsignedWide *endPtr,

        register UnsignedWide       *result

    );

#endif /* __MicrosecondTrap__ */