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43 lines
1,020 B
C
43 lines
1,020 B
C
/*++
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Copyright (c) 2006 Microsoft Corporation
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Module Name:
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page.h
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Abstract:
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Goodies for manipulating pages of memory.
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Author:
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Leonardo de Moura (leonardo) 2011-02-27.
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Revision History:
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--*/
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#ifndef PAGE_H_
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#define PAGE_H_
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#include "util/memory_manager.h"
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#define PAGE_HEADER_SZ sizeof(size_t)
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#define DEFAULT_PAGE_SIZE (8192 - PAGE_HEADER_SZ)
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#define PAGE_HEADER_MASK (static_cast<size_t>(-1) - 1)
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inline char * prev_page(char * page) {
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size_t tagged_ptr = reinterpret_cast<size_t *>(page)[-1];
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return reinterpret_cast<char *>(tagged_ptr & PAGE_HEADER_MASK);
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}
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inline bool is_default_page(char * page) {
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size_t tagged_ptr = reinterpret_cast<size_t *>(page)[-1];
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return static_cast<bool>(tagged_ptr & 1);
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}
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inline char * end_of_default_page(char * p) { return p + DEFAULT_PAGE_SIZE; }
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void del_pages(char * page);
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char * allocate_default_page(char * prev, char * & free_pages);
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char * allocate_page(char * prev, size_t sz);
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void recycle_page(char * p, char * & free_pages);
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#endif
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