diff options
Diffstat (limited to 'src/vppinfra/hash.h')
| -rw-r--r-- | src/vppinfra/hash.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/vppinfra/hash.h b/src/vppinfra/hash.h index 21986ea774c..de155e6ac1c 100644 --- a/src/vppinfra/hash.h +++ b/src/vppinfra/hash.h @@ -77,6 +77,7 @@ typedef struct hash_header #define KEY_FUNC_POINTER_UWORD (1) /*< sum = *(uword *) key */ #define KEY_FUNC_POINTER_U32 (2) /*< sum = *(u32 *) key */ #define KEY_FUNC_STRING (3) /*< sum = string_key_sum, etc. */ +#define KEY_FUNC_MEM (4) /*< sum = mem_key_sum */ /* key comparison function */ hash_key_equal_function_t *key_equal; @@ -672,6 +673,20 @@ extern uword string_key_sum (hash_t * h, uword key); extern uword string_key_equal (hash_t * h, uword key1, uword key2); extern u8 *string_key_format_pair (u8 * s, va_list * args); +/* + * Note: if you plan to put a hash into shared memory, + * the key sum and key equal functions MUST be set to magic constants! + * PIC means that whichever process sets up the hash won't have + * the actual key sum functions at the same place, leading to + * very hard-to-find bugs... + */ + +#define hash_create_shmem(elts,key_bytes,value_bytes) \ + hash_create2((elts),(key_bytes),(value_bytes), \ + (hash_key_sum_function_t *) KEY_FUNC_MEM, \ + (hash_key_equal_function_t *)KEY_FUNC_MEM, \ + 0, 0) + #define hash_create_string(elts,value_bytes) \ hash_create2((elts),0,(value_bytes), \ (hash_key_sum_function_t *) KEY_FUNC_STRING, \ |