Quelle atomic_ops_malloc.h Sprache: C

/*
* Copyright (c) 2005 Hewlett-Packard Development Company, L.P.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/

/* Almost lock-free malloc implementation based on stack implementation. */
/* See doc/README_malloc.txt file for detailed usage rules.              */

#ifndef AO_MALLOC_H
#define AO_MALLOC_H

#include "atomic_ops_stack.h"

#include <stddef.h> /* for size_t */

#ifdef __cplusplus
  extern "C" {
#endif

#ifdef AO_STACK_IS_LOCK_FREE
# define AO_MALLOC_IS_LOCK_FREE
#endif

#ifndef AO_ATTR_MALLOC
# if AO_GNUC_PREREQ(3, 1)
#   define AO_ATTR_MALLOC __attribute__((__malloc__))
# elif defined(_MSC_VER) && (_MSC_VER >= 1900) && !defined(__EDG__)
#   define AO_ATTR_MALLOC \
                __declspec(allocator) __declspec(noalias) __declspec(restrict)
# elif defined(_MSC_VER) && _MSC_VER >= 1400
#   define AO_ATTR_MALLOC __declspec(noalias) __declspec(restrict)
# else
#   define AO_ATTR_MALLOC /* empty */
# endif
#endif

#ifndef AO_ATTR_ALLOC_SIZE
# ifdef __clang__
#   if __has_attribute(__alloc_size__)
#     define AO_ATTR_ALLOC_SIZE(argnum) \
                __attribute__((__alloc_size__(argnum)))
#   else
#     define AO_ATTR_ALLOC_SIZE(argnum) /* empty */
#   endif
# elif AO_GNUC_PREREQ(4, 3) && !defined(__ICC)
#   define AO_ATTR_ALLOC_SIZE(argnum) __attribute__((__alloc_size__(argnum)))
# else
#   define AO_ATTR_ALLOC_SIZE(argnum) /* empty */
# endif
#endif

void AO_free(void *);

AO_ATTR_MALLOC AO_ATTR_ALLOC_SIZE(1)
void * AO_malloc(size_t);

/* Allow use of mmap to grow the heap.  No-op on some platforms.        */
void AO_malloc_enable_mmap(void);

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

#endif /* !AO_MALLOC_H */

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