src/cx/mempool.h

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
 *
 * 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
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 */
/**
 * \file mempool.h
 * \brief Interface for memory pool implementations.
 * \author Mike Becker
 * \author Olaf Wintermann
 * \version 3.0
 * \copyright 2-Clause BSD License
 */

#ifndef UCX_MEMPOOL_H
#define UCX_MEMPOOL_H

#include "allocator.h"

#ifdef __cplusplus
extern "C" {
#endif

/**
 * Memory pool class type.
 */
typedef struct cx_mempool_class_s cx_mempool_class;

/**
 * The basic structure of a memory pool.
 * Should be the first member of an actual memory pool implementation.
 */
struct cx_mempool_s {
    /**
     * The pool class definition.
     */
    cx_mempool_class *cl;
    /**
     * The provided allocator.
     */
    CxAllocator const *allocator;
};

/**
 * Common type for all memory pool implementations.
 */
typedef struct cx_mempool_s CxMempool;

/**
 * The class definition for a memory pool.
 */
struct cx_mempool_class_s {
    /** Member function for destroying the pool. */
    __attribute__((__nonnull__))
    void (*destroy)(CxMempool *pool);

    /** Member function for setting a destructor. */
    __attribute__((__nonnull__))
    void (*set_destructor)(
            CxMempool *pool,
            void *memory,
            cx_destructor_func fnc
    );
};


/**
 * Destroys a memory pool including their contents.
 *
 * @param pool the memory pool to destroy
 */
__attribute__((__nonnull__))
static inline void cxMempoolDestroy(CxMempool *pool) {
    pool->cl->destroy(pool);
}

/**
 * Sets a destructor function for an allocated memory object.
 *
 * If the memory is not managed by the pool, the behavior is undefined.
 *
 * @param pool the pool
 * @param memory the objected allocated in the pool
 * @param fnc the destructor function
 */
__attribute__((__nonnull__))
static inline void cxMempoolSetDestructor(
        CxMempool *pool,
        void *memory,
        cx_destructor_func fnc
) {
    pool->cl->set_destructor(pool, memory, fnc);
}

#ifdef __cplusplus
} // extern "C"
#endif

#endif // UCX_MEMPOOL_H