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"CHUNK" in minix3/kernel/const.h
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Ravi Bangoria  
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 More options Sep 17 2012, 6:04 am
Newsgroups: comp.os.minix
From: Ravi Bangoria <prb...@gmail.com>
Date: Mon, 17 Sep 2012 03:04:38 -0700 (PDT)
Local: Mon, Sep 17 2012 6:04 am
Subject: "CHUNK" in minix3/kernel/const.h
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What is "chunk" in minix kernel terminology? I have seen this

    /* Constants and macros for bit map manipulation. */
    #define BITCHUNK_BITS          (sizeof(bitchunk_t) * CHAR_BIT)
    #define BITMAP_CHUNKS(nr_bits) (((nr_bits)+BITCHUNK_BITS-1)/BITCHUNK_BITS)  
    #define MAP_CHUNK(map,bit)     (map)[((bit)/BITCHUNK_BITS)]
    #define CHUNK_OFFSET(bit)      ((bit)%BITCHUNK_BITS))
    #define GET_BIT(map,bit)       ( MAP_CHUNK(map,bit) & (1 << CHUNK_OFFSET(bit) )
    #define SET_BIT(map,bit)       ( MAP_CHUNK(map,bit) |= (1 << CHUNK_OFFSET(bit) )
    #define UNSET_BIT(map,bit)     ( MAP_CHUNK(map,bit) &= ~(1 << CHUNK_OFFSET(bit) )

    #define get_sys_bit(map,bit) \
        ( MAP_CHUNK(map.chunk,bit) & (1 << CHUNK_OFFSET(bit) )
    #define set_sys_bit(map,bit) \
        ( MAP_CHUNK(map.chunk,bit) |= (1 << CHUNK_OFFSET(bit) )
    #define unset_sys_bit(map,bit) \
        ( MAP_CHUNK(map.chunk,bit) &= ~(1 << CHUNK_OFFSET(bit) )
    #define NR_SYS_CHUNKS BITMAP_CHUNKS(NR_SYS_PROCS)

in kernel/const.h


 
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