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LIGHT-ROM 1 (Amiga Library Services)(1994).iso
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d927.lha
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src
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ring.h
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C/C++ Source or Header
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1993-10-07
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3KB
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97 lines
/*
* Copyright (c) 1988 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted provided
* that: (1) source distributions retain this entire copyright notice and
* comment, and (2) distributions including binaries display the following
* acknowledgement: ``This product includes software developed by the
* University of California, Berkeley and its contributors'' in the
* documentation or other materials provided with the distribution and in
* all advertising materials mentioning features or use of this software.
* Neither the name of the University nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* @(#)ring.h 5.1 (Berkeley) 9/14/90
*/
/*
* This defines a structure for a ring buffer.
*
* The circular buffer has two parts:
*(((
* full: [consume, supply)
* empty: [supply, consume)
*]]]
*
*/
typedef struct {
char *consume, /* where data comes out of */
*supply, /* where data comes in to */
*bottom, /* lowest address in buffer */
*top, /* highest address+1 in buffer */
*mark; /* marker (user defined) */
int size; /* size in bytes of buffer */
u_long consumetime, /* help us keep straight full, empty, etc. */
supplytime;
} Ring;
/* Here are some functions and macros to deal with the ring buffer */
#if defined(LINT_ARGS)
/* Initialization routine */
extern int
ring_init(Ring *ring, char *buffer, int count);
/* Data movement routines */
extern void
ring_supply_data(Ring *ring, char *buffer, int count);
#ifdef notdef
extern void
ring_consume_data(Ring *ring, char *buffer, int count);
#endif
/* Buffer state transition routines */
extern void
ring_supplied(Ring *ring, int count),
ring_consumed(Ring *ring, int count);
/* Buffer state query routines */
extern int
ring_empty_count(Ring *ring),
ring_empty_consecutive(Ring *ring),
ring_full_count(Ring *ring),
ring_full_consecutive(Ring *ring);
#else /* LINT_ARGS */
extern int
ring_init();
extern void
ring_supply_data();
#ifdef notdef
extern void
ring_consume_data();
#endif
extern void
ring_supplied(),
ring_consumed();
extern void
ring_clear_mark(),
ring_mark();
extern int
ring_empty_count(),
ring_empty_consecutive(),
ring_full_count(),
ring_full_consecutive();
#endif /* defined(LINT_ARGS) */