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add a little documentation to memarea. (I have been testing a tool.)

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This commit is contained in:
Nick Mathewson 2016-03-26 10:09:19 -04:00
parent c0568a89d9
commit cc90b57b04
1 changed files with 6 additions and 1 deletions
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7
src/common/memarea.c
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@ -21,6 +21,8 @@
* value. */
#define MEMAREA_ALIGN SIZEOF_VOID_P
/** A value which, when masked out of a pointer, produces a maximally aligned
* pointer. */
#if MEMAREA_ALIGN == 4
#define MEMAREA_ALIGN_MASK 3lu
#elif MEMAREA_ALIGN == 8
@ -31,6 +33,7 @@
#if defined(__GNUC__) && defined(FLEXIBLE_ARRAY_MEMBER)
#define USE_ALIGNED_ATTRIBUTE
/** Name for the 'memory' member of a memory chunk. */
#define U_MEM mem
#else
#define U_MEM u.mem
@ -83,12 +86,14 @@ typedef struct memarea_chunk_t {
* greater than or equal to mem+mem_size, this chunk is
* full. */
#ifdef USE_ALIGNED_ATTRIBUTE
/** Actual content of the memory chunk. */
char mem[FLEXIBLE_ARRAY_MEMBER] __attribute__((aligned(MEMAREA_ALIGN)));
#else
union {
char mem[1]; /**< Memory space in this chunk. */
void *void_for_alignment_; /**< Dummy; used to make sure mem is aligned. */
} u;
} u; /**< Union used to enforce alignment when we don't have support for
* doing it right. */
#endif
} memarea_chunk_t;