136 lines
4.0 KiB
C
136 lines
4.0 KiB
C
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/*
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* Copyright (C) Igor Sysoev
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* Copyright (C) NGINX, Inc.
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*/
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#ifndef _NXT_UNIX_MALLOC_H_INCLUDED_
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#define _NXT_UNIX_MALLOC_H_INCLUDED_
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NXT_EXPORT void *nxt_malloc(size_t size)
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NXT_MALLOC_LIKE;
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NXT_EXPORT void *nxt_zalloc(size_t size)
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NXT_MALLOC_LIKE;
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NXT_EXPORT void *nxt_realloc(void *p, size_t size)
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NXT_MALLOC_LIKE;
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NXT_EXPORT void *nxt_memalign(size_t alignment, size_t size)
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NXT_MALLOC_LIKE;
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#if (NXT_DEBUG)
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NXT_EXPORT void nxt_free(void *p);
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#else
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#define \
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nxt_free(p) \
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free(p)
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#endif
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#if (NXT_HAVE_MALLOC_USABLE_SIZE)
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/*
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* Due to allocation strategies malloc() allocators may allocate more
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* memory than is requested, so malloc_usable_size() allows to use all
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* allocated memory. It is helpful for socket buffers or unaligned disk
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* file I/O. However, they may be suboptimal for aligned disk file I/O.
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*/
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#if (NXT_LINUX)
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/*
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* Linux glibc stores bookkeeping information together with allocated
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* memory itself. Size of the bookkeeping information is 12 or 24 bytes
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* on 32-bit and 64-bit platforms respectively. Due to alignment there
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* are usually 4 or 8 spare bytes respectively. However, if allocation
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* is larger than about 128K, spare size may be up to one page: glibc aligns
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* sum of allocation and bookkeeping size to a page. So if requirement
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* of the large allocation size is not strict it is better to allocate
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* with small cutback and then to adjust size with malloc_usable_size().
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* Glibc malloc_usable_size() is fast operation.
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*/
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#define \
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nxt_malloc_usable_size(p, size) \
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size = malloc_usable_size(p)
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#define \
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nxt_malloc_cutback(cutback, size) \
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size = ((cutback) && size > 127 * 1024) ? size - 32 : size
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#elif (NXT_FREEBSD)
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/*
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* FreeBSD prior to 7.0 (phkmalloc) aligns sizes to
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* 16 - 2048 a power of two
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* 2049 - ... aligned to 4K
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*
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* FreeBSD 7.0 (jemalloc) aligns sizes to:
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* 2 - 8 a power of two
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* 9 - 512 aligned to 16
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* 513 - 2048 a power of two, i.e. aligned to 1K
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* 2049 - 1M aligned to 4K
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* 1M- ... aligned to 1M
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* See table in src/lib/libc/stdlib/malloc.c
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*
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* FreeBSD 7.0 malloc_usable_size() is fast for allocations, which
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* are lesser than 1M. Larger allocations require mutex acquiring.
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*/
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#define \
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nxt_malloc_usable_size(p, size) \
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size = malloc_usable_size(p)
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#define \
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nxt_malloc_cutback(cutback, size)
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#endif
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#elif (NXT_HAVE_MALLOC_GOOD_SIZE)
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/*
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* MacOSX aligns sizes to
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* 16 - 496 aligned to 16, 32-bit
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* 16 - 992 aligned to 16, 64-bit
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* 497/993 - 15K aligned to 512, if lesser than 1G RAM
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* 497/993 - 127K aligned to 512, otherwise
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* 15K/127K- ... aligned to 4K
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*
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* malloc_good_size() is faster than malloc_size()
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*/
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#define \
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nxt_malloc_usable_size(p, size) \
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size = malloc_good_size(size)
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#define \
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nxt_malloc_cutback(cutback, size)
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#else
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#define \
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nxt_malloc_usable_size(p, size)
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#define \
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nxt_malloc_cutback(cutback, size)
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#endif
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#if (NXT_HAVE_POSIX_MEMALIGN || NXT_HAVE_MEMALIGN)
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#define NXT_MAX_MEMALIGN_SHIFT 32
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#elif (NXT_FREEBSD)
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#define NXT_MAX_MEMALIGN_SHIFT 12
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#else
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#define NXT_MAX_MEMALIGN_SHIFT 3
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#endif
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#endif /* _NXT_UNIX_MALLOC_H_INCLUDED_ */
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