* tables and machines lacking per-cpu data suppport.
*/
#define COUNT_COMMIT_ORDER 10
+#define DEFAULT_SPLIT_COUNT_MASK 0xFUL
#define CHAIN_LEN_TARGET 1
#define CHAIN_LEN_RESIZE_THRESHOLD 3
/* Value of the end pointer. Should not interact with flags. */
#define END_VALUE NULL
+/*
+ * ht_items_count: Split-counters counting the number of node addition
+ * and removal in the table. Only used if the CDS_LFHT_ACCOUNTING flag
+ * is set at hash table creation.
+ *
+ * These are free-running counters, never reset to zero. They count the
+ * number of add/remove, and trigger every (1 << COUNT_COMMIT_ORDER)
+ * operations to update the global counter. We choose a power-of-2 value
+ * for the trigger to deal with 32 or 64-bit overflow of the counter.
+ */
struct ht_items_count {
unsigned long add, del;
} __attribute__((aligned(CAA_CACHE_LINE_SIZE)));
+/*
+ * rcu_level: Contains the per order-index-level dummy node table. The
+ * size of each dummy node table is half the number of hashes contained
+ * in this order (except for order 0). The minimum allocation size
+ * parameter allows combining the dummy node arrays of the lowermost
+ * levels to improve cache locality for small index orders.
+ */
struct rcu_level {
/* Note: manually update allocation length when adding a field */
struct _cds_lfht_node nodes[0];
};
+/*
+ * rcu_table: Contains the size and desired new size if a resize
+ * operation is in progress, as well as the statically-sized array of
+ * rcu_level pointers.
+ */
struct rcu_table {
unsigned long size; /* always a power of 2, shared (RCU) */
unsigned long resize_target;
struct rcu_level *tbl[MAX_TABLE_ORDER];
};
+/*
+ * cds_lfht: Top-level data structure representing a lock-free hash
+ * table. Defined in the implementation file to make it be an opaque
+ * cookie to users.
+ */
struct cds_lfht {
struct rcu_table t;
cds_lfht_hash_fct hash_fct;
struct ht_items_count *split_count; /* split item count */
};
+/*
+ * rcu_resize_work: Contains arguments passed to RCU worker thread
+ * responsible for performing lazy resize.
+ */
struct rcu_resize_work {
struct rcu_head head;
struct cds_lfht *ht;
};
+/*
+ * partition_resize_work: Contains arguments passed to worker threads
+ * executing the hash table resize on partitions of the hash table
+ * assigned to each processor's worker thread.
+ */
struct partition_resize_work {
pthread_t thread_id;
struct cds_lfht *ht;
unsigned int fls_ulong(unsigned long x)
{
-#if (CAA_BITS_PER_lONG == 32)
+#if (CAA_BITS_PER_LONG == 32)
return fls_u32(x);
#else
return fls_u64(x);
}
#ifdef POISON_FREE
-#define poison_free(ptr) \
- do { \
- memset(ptr, 0x42, sizeof(*(ptr))); \
- free(ptr); \
+#define poison_free(ptr) \
+ do { \
+ if (ptr) { \
+ memset(ptr, 0x42, sizeof(*(ptr))); \
+ free(ptr); \
+ } \
} while (0)
#else
#define poison_free(ptr) free(ptr)
static
void cds_lfht_resize_lazy(struct cds_lfht *ht, unsigned long size, int growth);
-/*
- * If the sched_getcpu() and sysconf(_SC_NPROCESSORS_CONF) calls are
- * available, then we support hash table item accounting.
- * In the unfortunate event the number of CPUs reported would be
- * inaccurate, we use modulo arithmetic on the number of CPUs we got.
- */
-#if defined(HAVE_SYSCONF)
-
static
void cds_lfht_resize_lazy_count(struct cds_lfht *ht, unsigned long size,
unsigned long count);
static long nr_cpus_mask = -1;
static long split_count_mask = -1;
+#if defined(HAVE_SYSCONF)
static void ht_init_nr_cpus_mask(void)
{
long maxcpus;
maxcpus = 1UL << get_count_order_ulong(maxcpus);
nr_cpus_mask = maxcpus - 1;
}
+#else /* #if defined(HAVE_SYSCONF) */
+static void ht_init_nr_cpus_mask(void)
+{
+ nr_cpus_mask = -2;
+}
+#endif /* #else #if defined(HAVE_SYSCONF) */
static
-struct ht_items_count *alloc_split_items_count(void)
+void alloc_split_items_count(struct cds_lfht *ht)
{
struct ht_items_count *count;
if (nr_cpus_mask == -1) {
ht_init_nr_cpus_mask();
- split_count_mask = nr_cpus_mask;
+ if (nr_cpus_mask < 0)
+ split_count_mask = DEFAULT_SPLIT_COUNT_MASK;
+ else
+ split_count_mask = nr_cpus_mask;
}
- if (split_count_mask < 0)
- return NULL;
- else
- return calloc(split_count_mask + 1, sizeof(*count));
+ assert(split_count_mask >= 0);
+
+ if (ht->flags & CDS_LFHT_ACCOUNTING) {
+ ht->split_count = calloc(split_count_mask + 1, sizeof(*count));
+ assert(ht->split_count);
+ } else {
+ ht->split_count = NULL;
+ }
}
static
-void free_split_items_count(struct ht_items_count *count)
+void free_split_items_count(struct cds_lfht *ht)
{
- poison_free(count);
+ poison_free(ht->split_count);
}
#if defined(HAVE_SCHED_GETCPU)
}
}
-#else /* #if defined(HAVE_SYSCONF) */
-
-static const long nr_cpus_mask = -2;
-static const long split_count_mask = -2;
-
-static
-struct ht_items_count *alloc_split_items_count(void)
-{
- return NULL;
-}
-
-static
-void free_split_items_count(struct ht_items_count *count)
-{
-}
-
-static
-void ht_count_add(struct cds_lfht *ht, unsigned long size, unsigned long hash)
-{
-}
-
-static
-void ht_count_del(struct cds_lfht *ht, unsigned long size, unsigned long hash)
-{
-}
-
-#endif /* #else #if defined(HAVE_SYSCONF) */
-
-
static
void check_resize(struct cds_lfht *ht, unsigned long size, uint32_t chain_len)
{
init_size = max(init_size, min_alloc_size);
ht = calloc(1, sizeof(struct cds_lfht));
assert(ht);
+ ht->flags = flags;
ht->hash_fct = hash_fct;
ht->compare_fct = compare_fct;
ht->hash_seed = hash_seed;
ht->cds_lfht_rcu_register_thread = cds_lfht_rcu_register_thread;
ht->cds_lfht_rcu_unregister_thread = cds_lfht_rcu_unregister_thread;
ht->resize_attr = attr;
- ht->split_count = alloc_split_items_count();
+ alloc_split_items_count(ht);
/* this mutex should not nest in read-side C.S. */
pthread_mutex_init(&ht->resize_mutex, NULL);
- ht->flags = flags;
order = get_count_order_ulong(init_size);
ht->t.resize_target = 1UL << order;
- cds_lfht_create_dummy(ht, 1UL << order);
- ht->t.size = 1UL << order;
ht->min_alloc_size = min_alloc_size;
ht->min_alloc_order = get_count_order_ulong(min_alloc_size);
+ cds_lfht_create_dummy(ht, 1UL << order);
+ ht->t.size = 1UL << order;
return ht;
}
break;
}
next = rcu_dereference(node->p.next);
+ assert(node == clear_flag(node));
if (likely(!is_removed(next))
&& !is_dummy(next)
- && clear_flag(node)->p.reverse_hash == reverse_hash
+ && node->p.reverse_hash == reverse_hash
&& likely(!ht->compare_fct(node->key, node->key_len, key, key_len))) {
break;
}
ret = cds_lfht_delete_dummy(ht);
if (ret)
return ret;
- free_split_items_count(ht->split_count);
+ free_split_items_count(ht);
if (attr)
*attr = ht->resize_attr;
poison_free(ht);
unsigned long nr_dummy = 0;
*approx_before = 0;
- if (split_count_mask >= 0) {
+ if (ht->split_count) {
int i;
for (i = 0; i < split_count_mask + 1; i++) {
} while (!is_end(node));
dbg_printf("number of dummy nodes: %lu\n", nr_dummy);
*approx_after = 0;
- if (split_count_mask >= 0) {
+ if (ht->split_count) {
int i;
for (i = 0; i < split_count_mask + 1; i++) {
}
}
-#if defined(HAVE_SYSCONF)
-
static
void cds_lfht_resize_lazy_count(struct cds_lfht *ht, unsigned long size,
unsigned long count)
CMM_STORE_SHARED(ht->t.resize_initiated, 1);
}
}
-
-#endif
projects / urcu.git / blobdiff