ucx: src/cx/allocator.h@8aea65ae1eaf (annotated)

src/cx/allocator.h@8aea65ae1eaf (annotated)

src/cx/allocator.h

Sat, 09 Apr 2022 16:37:43 +0200

author: Mike Becker <universe@uap-core.de>
date: Sat, 09 Apr 2022 16:37:43 +0200
changeset 508: 8aea65ae1eaf
parent 503: a89857072ace
child 526: b070ef465313
permissions: -rw-r--r--

#168 - add attributes and const

 /*
  * 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
  * 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.
  */
 /**
  * \file allocator.h
  * Interface for custom allocators.
  */
 #ifndef UCX_ALLOCATOR_H
 #define UCX_ALLOCATOR_H
 #include "common.h"
 #ifdef __cplusplus
 extern "C" {
 #endif
 /**
  * The class definition for an allocator.
  */
 typedef struct {
     /**
      * The allocator's malloc() implementation.
      */
     void *(*malloc)(
             void *data,
             size_t n
     );
     /**
      * The allocator's realloc() implementation.
      */
     void *(*realloc)(
             void *data,
             void *mem,
             size_t n
     )
     __attribute__((__warn_unused_result__));
     /**
      * The allocator's calloc() implementation.
      */
     void *(*calloc)(
             void *data,
             size_t nelem,
             size_t n
     );
     /**
      * The allocator's free() implementation.
      */
     void (*free)(
             void *data,
             void *mem
     )
     __attribute__((__nonnull__));
 } cx_allocator_class;
 /**
  * Structure holding the data for an allocator.
  */
 struct cx_allocator_s {
     /**
      * A pointer to the instance of the allocator class.
      */
     cx_allocator_class *cl;
     /**
      * A pointer to the data this allocator uses.
      */
     void *data;
 };
 /**
  * High-Level type alias for the allocator type.
  */
 typedef struct cx_allocator_s CxAllocator;
 /**
  * A default allocator using standard library malloc() etc.
  */
 extern CxAllocator *cxDefaultAllocator;
 /**
  * Function pointer type for destructor functions.
  *
  * A destructor function deallocates possible contents and MAY free the memory
  * pointed to by \p memory.
  *
  * @param memory a pointer to the object to destruct
  * @return \p memory if it has NOT been free'd by this destructor, otherwise \c NULL
   */
 typedef void *(*cx_destructor_func)(void *memory)
         __attribute__((__nonnull__, __warn_unused_result__));
 /**
  * Allocate \p n bytes of memory.
  *
  * @param allocator the allocator
  * @param n the number of bytes
  * @return a pointer to the allocated memory
  */
 void *cxMalloc(
         CxAllocator const *allocator,
         size_t n
 )
 __attribute__((__malloc__))
 __attribute__((__alloc_size__(2)));
 /**
  * Re-allocate the previously allocated block in \p mem, making the new block \p n bytes long.
  * This function may return the same pointer that was passed to it, if moving the memory
  * was not necessary.
  *
  * \note Re-allocating a block allocated by a different allocator is undefined.
  *
  * @param allocator the allocator
  * @param mem pointer to the previously allocated block
  * @param n the new size in bytes
  * @return a pointer to the re-allocated memory
  */
 void *cxRealloc(
         CxAllocator const *allocator,
         void *mem,
         size_t n
 )
 __attribute__((__warn_unused_result__))
 __attribute__((__alloc_size__(3)));
 /**
  * Re-allocate a previously allocated block and changes the pointer in-place, if necessary.
  * This function acts like cxRealloc() using the pointer pointed to by \p mem.
  * On success, the pointer is changed to the new location (in case the
  *
  * \note Re-allocating a block allocated by a different allocator is undefined.
  *
  * \par Error handling
  * \c errno will be set, if the underlying realloc function does so.
  *
  * @param allocator the allocator
  * @param mem pointer to the pointer to allocated block
  * @param n the new size in bytes
  * @return zero on success, non-zero on failure
  */
 int cxReallocate(
         CxAllocator const *allocator,
         void **mem,
         size_t n
 )
 __attribute__((__nonnull__));
 /**
  * Allocate \p nelem elements of \p n bytes each, all initialized to zero.
  *
  * @param allocator the allocator
  * @param nelem the number of elements
  * @param n the size of each element in bytes
  * @return a pointer to the allocated memory
  */
 void *cxCalloc(
         CxAllocator const *allocator,
         size_t nelem,
         size_t n
 )
 __attribute__((__malloc__))
 __attribute__((__alloc_size__(2, 3)));
 /**
  * Free a block allocated by this allocator.
  *
  * \note Freeing a block of a different allocator is undefined.
  *
  * @param allocator the allocator
  * @param mem a pointer to the block to free
  */
 void cxFree(
         CxAllocator const *allocator,
         void *mem
 )
 __attribute__((__nonnull__));
 #ifdef __cplusplus
 } /* extern "C" */
 #endif
 #endif /* UCX_ALLOCATOR_H */

Mercurial > hg > ucx / annotate

src/cx/allocator.h@8aea65ae1eaf (annotated)

src/cx/allocator.h