X-Git-Url: https://git.liburcu.org/?p=urcu.git;a=blobdiff_plain;f=rculfhash.c;h=49c7863a78a0d1b965dd9023451f795eb55d282e;hp=8dc9c59903dd28f85129eeb5c2e82990c0503689;hb=0b6aa0018b42d0b101c617ef6c6d34d0f4dd2258;hpb=7b3893e462472cd25a19ac6f5ebc09aeb031ea60 diff --git a/rculfhash.c b/rculfhash.c index 8dc9c59..49c7863 100644 --- a/rculfhash.c +++ b/rculfhash.c @@ -165,15 +165,10 @@ #include #include #include +#include #include #include -#ifdef DEBUG -#define dbg_printf(fmt, args...) printf("[debug rculfhash] " fmt, ## args) -#else -#define dbg_printf(fmt, args...) -#endif - /* * Split-counters lazily update the global counter each 1024 * addition/removal. It automatically keeps track of resize required. @@ -191,26 +186,12 @@ #define MIN_TABLE_ORDER 0 #define MIN_TABLE_SIZE (1UL << MIN_TABLE_ORDER) -#if (CAA_BITS_PER_LONG == 32) -#define MAX_TABLE_ORDER 32 -#else -#define MAX_TABLE_ORDER 64 -#endif - /* * Minimum number of bucket nodes to touch per thread to parallelize grow/shrink. */ #define MIN_PARTITION_PER_THREAD_ORDER 12 #define MIN_PARTITION_PER_THREAD (1UL << MIN_PARTITION_PER_THREAD_ORDER) -#ifndef min -#define min(a, b) ((a) < (b) ? (a) : (b)) -#endif - -#ifndef max -#define max(a, b) ((a) > (b) ? (a) : (b)) -#endif - /* * The removed flag needs to be updated atomically with the pointer. * It indicates that no node must attach to the node scheduled for @@ -239,45 +220,6 @@ struct ht_items_count { unsigned long add, del; } __attribute__((aligned(CAA_CACHE_LINE_SIZE))); -/* - * 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 { - unsigned long size; /* always a power of 2, shared (RCU) */ - int flags; - - /* - * We need to put the work threads offline (QSBR) when taking this - * mutex, because we use synchronize_rcu within this mutex critical - * section, which waits on read-side critical sections, and could - * therefore cause grace-period deadlock if we hold off RCU G.P. - * completion. - */ - pthread_mutex_t resize_mutex; /* resize mutex: add/del mutex */ - pthread_attr_t *resize_attr; /* Resize threads attributes */ - unsigned int in_progress_resize, in_progress_destroy; - unsigned long resize_target; - int resize_initiated; - const struct rcu_flavor_struct *flavor; - - long count; /* global approximate item count */ - struct ht_items_count *split_count; /* split item count */ - - unsigned long min_alloc_buckets_order; - unsigned long min_nr_alloc_buckets; - unsigned long max_nr_buckets; - /* - * Contains the per order-index-level bucket node table. The size - * of each bucket node table is half the number of hashes contained - * in this order (except for order 0). The minimum allocation size - * parameter allows combining the bucket node arrays of the lowermost - * levels to improve cache locality for small index orders. - */ - struct cds_lfht_node *tbl[MAX_TABLE_ORDER]; -}; - /* * rcu_resize_work: Contains arguments passed to RCU worker thread * responsible for performing lazy resize. @@ -505,18 +447,6 @@ int get_count_order_ulong(unsigned long x) return fls_ulong(x - 1); } -#ifdef POISON_FREE -#define poison_free(ptr) \ - do { \ - if (ptr) { \ - memset(ptr, 0x42, sizeof(*(ptr))); \ - free(ptr); \ - } \ - } while (0) -#else -#define poison_free(ptr) free(ptr) -#endif - static void cds_lfht_resize_lazy_grow(struct cds_lfht *ht, unsigned long size, int growth); @@ -743,16 +673,7 @@ unsigned long _uatomic_xchg_monotonic_increase(unsigned long *ptr, static void cds_lfht_alloc_bucket_table(struct cds_lfht *ht, unsigned long order) { - if (order == 0) { - ht->tbl[0] = calloc(ht->min_nr_alloc_buckets, - sizeof(struct cds_lfht_node)); - assert(ht->tbl[0]); - } else if (order > ht->min_alloc_buckets_order) { - ht->tbl[order] = calloc(1UL << (order -1), - sizeof(struct cds_lfht_node)); - assert(ht->tbl[order]); - } - /* Nothing to do for 0 < order && order <= ht->min_alloc_buckets_order */ + return ht->mm->alloc_bucket_table(ht, order); } /* @@ -763,32 +684,13 @@ void cds_lfht_alloc_bucket_table(struct cds_lfht *ht, unsigned long order) static void cds_lfht_free_bucket_table(struct cds_lfht *ht, unsigned long order) { - if (order == 0) - poison_free(ht->tbl[0]); - else if (order > ht->min_alloc_buckets_order) - poison_free(ht->tbl[order]); - /* Nothing to do for 0 < order && order <= ht->min_alloc_buckets_order */ + return ht->mm->free_bucket_table(ht, order); } static inline struct cds_lfht_node *bucket_at(struct cds_lfht *ht, unsigned long index) { - unsigned long order; - - if ((__builtin_constant_p(index) && index == 0) - || index < ht->min_nr_alloc_buckets) { - dbg_printf("bucket index %lu order 0 aridx 0\n", index); - return &ht->tbl[0][index]; - } - /* - * equivalent to get_count_order_ulong(index + 1), but optimizes - * away the non-existing 0 special-case for - * get_count_order_ulong. - */ - order = fls_ulong(index); - dbg_printf("bucket index %lu order %lu aridx %lu\n", - index, order, index & ((1UL << (order - 1)) - 1)); - return &ht->tbl[order][index & ((1UL << (order - 1)) - 1)]; + return ht->bucket_at(ht, index); } static inline @@ -1354,6 +1256,7 @@ struct cds_lfht *_cds_lfht_new(unsigned long init_size, unsigned long min_nr_alloc_buckets, unsigned long max_nr_buckets, int flags, + const struct cds_lfht_mm_type *mm, const struct rcu_flavor_struct *flavor, pthread_attr_t *attr) { @@ -1368,7 +1271,8 @@ struct cds_lfht *_cds_lfht_new(unsigned long init_size, if (!init_size || (init_size & (init_size - 1))) return NULL; - if (!max_nr_buckets) + /* max_nr_buckets == 0 for order based mm means infinite */ + if (mm == &cds_lfht_mm_order && !max_nr_buckets) max_nr_buckets = 1UL << (MAX_TABLE_ORDER - 1); /* max_nr_buckets must be power of two */ @@ -1379,8 +1283,12 @@ struct cds_lfht *_cds_lfht_new(unsigned long init_size, init_size = max(init_size, MIN_TABLE_SIZE); max_nr_buckets = max(max_nr_buckets, min_nr_alloc_buckets); init_size = min(init_size, max_nr_buckets); - ht = calloc(1, sizeof(struct cds_lfht)); + + ht = mm->alloc_cds_lfht(min_nr_alloc_buckets, max_nr_buckets); assert(ht); + assert(ht->mm == mm); + assert(ht->bucket_at == mm->bucket_at); + ht->flags = flags; ht->flavor = flavor; ht->resize_attr = attr; @@ -1389,9 +1297,6 @@ struct cds_lfht *_cds_lfht_new(unsigned long init_size, pthread_mutex_init(&ht->resize_mutex, NULL); order = get_count_order_ulong(init_size); ht->resize_target = 1UL << order; - ht->min_nr_alloc_buckets = min_nr_alloc_buckets; - ht->min_alloc_buckets_order = get_count_order_ulong(min_nr_alloc_buckets); - ht->max_nr_buckets = max_nr_buckets; cds_lfht_create_bucket(ht, 1UL << order); ht->size = 1UL << order; return ht;