commit cc90b57b045596a3ace603b23c6c932c841cb050 Author: Nick Mathewson nickm@torproject.org Date: Sat Mar 26 10:09:19 2016 -0400
add a little documentation to memarea. (I have been testing a tool.) --- src/common/memarea.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/src/common/memarea.c b/src/common/memarea.c index 5d5dc0c..cfba80b 100644 --- a/src/common/memarea.c +++ b/src/common/memarea.c @@ -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;