wangfq
173dd6874f
- 来源: 合宙 LuatOS 官方仓库 air780epm 模块完整代码 - 路径: luatos/air780epm/module/Air780EPM/demo 含官方 demo(含 mqtt/mqtts/socket/uart 等) - 后续: 基于 demo 开发 UART<->MQTT 数据上报功能
106 lines
4.1 KiB
C
106 lines
4.1 KiB
C
/*
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Interface definitions for luat_bget.c, the memory management package.
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在原版基础上，改成纯函数实现
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*/
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//#include <assert.h>
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#include <string.h>
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typedef long bufsize;
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#define MemSize int /* Type for size arguments to memxxx()
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functions such as memcmp(). */
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#define SizeQuant 8 /* Buffer allocation size quantum:
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all buffers allocated are a
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multiple of this size. This
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MUST be a power of two. */
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#if 1
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#define BufStats 1 /* Define this symbol to enable the
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bstats() function which calculates
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the total free space in the buffer
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pool, the largest available
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buffer, and the total space
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currently allocated. */
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#endif
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#if 0
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#define FreeWipe 1 /* Wipe free buffers to a guaranteed
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pattern of garbage to trip up
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miscreants who attempt to use
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pointers into released buffers. */
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#endif
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#if 1
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#define BestFit 1 /* Use a best fit algorithm when
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searching for space for an
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allocation request. This uses
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memory more efficiently, but
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allocation will be much slower. */
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#endif
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/* Queue links */
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struct qlinks {
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struct bfhead *flink; /* Forward link */
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struct bfhead *blink; /* Backward link */
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};
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/* Header in allocated and free buffers */
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struct bhead {
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bufsize prevfree; /* Relative link back to previous
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free buffer in memory or 0 if
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previous buffer is allocated. */
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bufsize bsize; /* Buffer size: positive if free,
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negative if allocated. */
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};
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#define BH(p) ((struct bhead *) (p))
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/* Header in directly allocated buffers (by acqfcn) */
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struct bdhead {
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bufsize tsize; /* Total size, including overhead */
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struct bhead bh; /* Common header */
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};
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#define BDH(p) ((struct bdhead *) (p))
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/* Header in free buffers */
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struct bfhead {
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struct bhead bh; /* Common allocated/free header */
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struct qlinks ql; /* Links on free list */
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};
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#define BFH(p) ((struct bfhead *) (p))
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// static struct bfhead freelist = { /* List of free buffers */
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// {0, 0},
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// {&freelist, &freelist}
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// };
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typedef struct luat_bget
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{
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#ifdef BufStats
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bufsize totalloc; /* Total space currently allocated */
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bufsize maxalloc;
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unsigned long numget;
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unsigned long numrel; /* Number of bget() and brel() calls */
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#endif /* BufStats */
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struct bfhead freelist;
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}luat_bget_t;
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void luat_bget_init(luat_bget_t* bg);
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void luat_bpool(luat_bget_t* bg, void *buffer, bufsize len);
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void *luat_bget(luat_bget_t* bg, bufsize size);
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void *luat_bgetz(luat_bget_t* bg, bufsize size);
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void *luat_bgetr(luat_bget_t* bg, void *buffer, bufsize newsize);
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void luat_brel(luat_bget_t* bg, void *buf);
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// void luat_bectl(luat_bget_t* bg, int (*compact)(bufsize sizereq, int sequence), void *(*acquire)(bufsize size), void (*release)(void *buf), bufsize pool_incr);
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void luat_bstats(luat_bget_t* bg, bufsize *curalloc, bufsize *totfree, bufsize *maxfree, unsigned long *nget, unsigned long *nrel);
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// void luat_bstatse(luat_bget_t* bg, bufsize *pool_incr, long *npool, unsigned long *npget, unsigned long *nprel, unsigned long *ndget, unsigned long *ndrel);
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// void luat_bufdump(luat_bget_t* bg, void *buf);
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// void luat_bpoold(luat_bget_t* bg, void *pool, int dumpalloc, int dumpfree);
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// int luat_bpoolv(luat_bget_t* bg, void *pool);
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bufsize luat_bstatsmaxget(luat_bget_t* bg);
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