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/* abq.h: QUEUE INTERFACE
*
* $Id$
* Copyright (c) 2001-2020 Ravenbrook Limited. See end of file for license.
*
* .purpose: A fixed-length FIFO queue.
*
* .design: <design/abq>
*/
#ifndef abq_h
#define abq_h
#include "meter.h"
#include "mpm.h"
/* Signatures */
#define ABQSig ((Sig)0x519AB099) /* SIGnature ABQ */
/* Prototypes */
typedef struct ABQStruct *ABQ;
typedef Res (*ABQDescribeElement)(void *element, mps_lib_FILE *stream, Count depth);
typedef Bool (*ABQVisitor)(Bool *deleteReturn, void *element, void *closure);
extern Res ABQInit(Arena arena, ABQ abq, void *owner, Count elements, Size elementSize);
extern Bool ABQCheck(ABQ abq);
extern void ABQFinish(Arena arena, ABQ abq);
extern Bool ABQPush(ABQ abq, void *element);
extern Bool ABQPop(ABQ abq, void *elementReturn);
extern Bool ABQPeek(ABQ abq, void *elementReturn);
extern Res ABQDescribe(ABQ abq, ABQDescribeElement describeElement, mps_lib_FILE *stream, Count depth);
extern Bool ABQIsEmpty(ABQ abq);
extern Bool ABQIsFull(ABQ abq);
extern Count ABQDepth(ABQ abq);
extern void ABQIterate(ABQ abq, ABQVisitor visitor, void *closure);
/* Types */
typedef struct ABQStruct
{
Sig sig; /* design.mps.sig.field */
Count elements;
Size elementSize;
Index in;
Index out;
void *queue;
/* Meter queue depth at each operation */
METER_DECL(push)
METER_DECL(pop)
METER_DECL(peek)
METER_DECL(delete)
} ABQStruct;
#endif /* abq_h */
/* C. COPYRIGHT AND LICENSE
*
* Copyright (C) 2001-2020 Ravenbrook Limited <https://www.ravenbrook.com/>.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
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