Fix CAA_BITS_PER_lONG typo

[urcu.git] / rculfhash.c

diff --git a/rculfhash.c b/rculfhash.c
index 46513dfd40562bb7c1e0bb24f39fee3656e378a2..ebefa92ad8460c0d49501b67261b9087832167e0 100644 (file)
--- a/rculfhash.c
+++ b/rculfhash.c
@@ -179,6 +179,7 @@
  * 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
 
@@ -453,7 +454,7 @@ unsigned int fls_u32(uint32_t x)
 
 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);
@@ -485,10 +486,12 @@ int get_count_order_ulong(unsigned long 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)
@@ -497,14 +500,6 @@ int get_count_order_ulong(unsigned long x)
 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);
@@ -512,6 +507,7 @@ void cds_lfht_resize_lazy_count(struct cds_lfht *ht, unsigned long size,
 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;
@@ -528,27 +524,40 @@ static void ht_init_nr_cpus_mask(void)
        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)
@@ -632,35 +641,6 @@ void ht_count_del(struct cds_lfht *ht, unsigned long size, unsigned long hash)
        }
 }
 
-#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)
 {
@@ -1350,6 +1330,7 @@ struct cds_lfht *_cds_lfht_new(cds_lfht_hash_fct hash_fct,
        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;
@@ -1362,16 +1343,15 @@ struct cds_lfht *_cds_lfht_new(cds_lfht_hash_fct hash_fct,
        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;
 }
 
@@ -1617,7 +1597,7 @@ int cds_lfht_destroy(struct cds_lfht *ht, pthread_attr_t **attr)
        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);
@@ -1635,7 +1615,7 @@ void cds_lfht_count_nodes(struct cds_lfht *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++) {
@@ -1665,7 +1645,7 @@ void cds_lfht_count_nodes(struct cds_lfht *ht,
        } 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++) {
@@ -1802,8 +1782,6 @@ void cds_lfht_resize_lazy(struct cds_lfht *ht, unsigned long size, int growth)
        }
 }
 
-#if defined(HAVE_SYSCONF)
-
 static
 void cds_lfht_resize_lazy_count(struct cds_lfht *ht, unsigned long size,
                                unsigned long count)
@@ -1828,5 +1806,3 @@ void cds_lfht_resize_lazy_count(struct cds_lfht *ht, unsigned long size,
                CMM_STORE_SHARED(ht->t.resize_initiated, 1);
        }
 }
-
-#endif