ctrump/common/queue.h

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/* -*- coding:utf-8 -*- 
 Copyright (c) 2009, Fixstars Corporation
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without modification, 
 are permitted provided that the following conditions are met:
 
   * Redistributions of source code must retain the above copyright notice,
     this list of conditions and the following disclaimer.
 
   * 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.
 
   * Neither the name of Fixstars Corporation 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 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 OWNER 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;
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 AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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*/

#ifndef CTRUMP_COMMON_QUEUE_H
#define CTRUMP_COMMON_QUEUE_H

#include "ctrump/common/dll.h"
#include <stddef.h>

#ifdef __cplusplus
extern "C" {
#endif

struct ctrump_mempool;


struct ctrump_queue {
    size_t size;                
    size_t elem_size;           
    void *elements;             
    unsigned int head;          
    unsigned int tail;          
    unsigned int rem;           
};

#define QUEUE_PUSH(t,q,e)                       \
    do {                                        \
        if ((q)->rem==0)                        \
            ctrump_queue_realloc(q);            \
                                                \
        ((t*)(q)->elements)[(q)->head] = (e);   \
        (q)->rem --;                            \
        (q)->head ++;                           \
        if ((q)->head == (q)->size)             \
            (q)->head = 0;                      \
    } while(0)

#define QUEUE_PUSH_PTR(t,q,dest)                \
    do {                                        \
        if ((q)->rem==0)                        \
            ctrump_queue_realloc(q);            \
                                                \
        dest = &((t*)(q)->elements)[(q)->head]; \
        (q)->rem --;                            \
        (q)->head ++;                           \
        if ((q)->head == (q)->size)             \
            (q)->head = 0;                      \
    } while(0)

#define QUEUE_POP(t,q,dest)                             \
    do {                                                \
        (dest) = ((t*)(q)->elements)[(q)->tail];        \
        (q)->tail++;                                    \
        (q)->rem++;                                     \
        if ((q)->tail == (q)->size)                     \
            (q)->tail = 0;                              \
    } while (0)

CTRUMP_EXTDEF void ctrump_queue_init(struct ctrump_queue *q, size_t nelem, size_t elem_size);

CTRUMP_EXTDEF void ctrump_queue_realloc(struct ctrump_queue *q);

CTRUMP_EXTDEF void ctrump_queue_destroy(struct ctrump_queue *q);

#ifdef __cplusplus
}
#endif

#endif

---