* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#define _GNU_SOURCE
#include <pthread.h>
#include <stdio.h>
#include <inttypes.h>
+#include <unistd.h>
#include <urcu/rculfhash.h>
+/*
+ * Number of least significant pointer bits reserved to represent the
+ * child type.
+ */
+#define JA_TYPE_BITS 3
+#define JA_TYPE_MAX_NR (1UL << JA_TYPE_BITS)
+#define JA_TYPE_MASK (JA_TYPE_MAX_NR - 1)
+#define JA_PTR_MASK (~JA_TYPE_MASK)
+
+#define JA_ENTRY_PER_NODE 256UL
+#define JA_LOG2_BITS_PER_BYTE 3U
+#define JA_BITS_PER_BYTE (1U << JA_LOG2_BITS_PER_BYTE)
+
+#define JA_MAX_DEPTH 9 /* Maximum depth, including leafs */
+
+/*
+ * Entry for NULL node is at index 8 of the table. It is never encoded
+ * in flags.
+ */
+#define NODE_INDEX_NULL 8
+
+/*
+ * Number of removals needed on a fallback node before we try to shrink
+ * it.
+ */
+#define JA_FALLBACK_REMOVAL_COUNT 8
+
/* Never declared. Opaque type used to store flagged node pointers. */
struct cds_ja_inode_flag;
+struct cds_ja_inode;
/*
* Shadow node contains mutex and call_rcu head associated with a node.
*/
struct cds_ja_shadow_node {
struct cds_lfht_node ht_node; /* hash table node */
- struct cds_ja_inode *node; /* reverse mapping and hash table key */
+ struct cds_ja_inode_flag *node_flag; /* reverse mapping and hash table key */
/*
* mutual exclusion on all nodes belonging to the same tree
* position (e.g. both nodes before and after recompaction
pthread_mutex_t *lock;
unsigned int nr_child; /* number of children in node */
struct rcu_head head; /* for deferred node and shadow node reclaim */
- int is_root; /* is it a root node ? */
int fallback_removal_count; /* removals left keeping fallback */
+ int level; /* level in the tree */
+ struct cds_ja *ja; /* toplevel judy array */
};
struct cds_ja {
unsigned long nr_fallback; /* Number of fallback nodes used */
};
+static inline
+struct cds_ja_inode_flag *ja_node_flag(struct cds_ja_inode *node,
+ unsigned long type)
+{
+ assert(type < (1UL << JA_TYPE_BITS));
+ return (struct cds_ja_inode_flag *) (((unsigned long) node) | type);
+}
+
+static inline
+struct cds_ja_inode *ja_node_ptr(struct cds_ja_inode_flag *node)
+{
+ return (struct cds_ja_inode *) (((unsigned long) node) & JA_PTR_MASK);
+}
+
+static inline
+unsigned long ja_node_type(struct cds_ja_inode_flag *node)
+{
+ unsigned long type;
+
+ if (ja_node_ptr(node) == NULL) {
+ return NODE_INDEX_NULL;
+ }
+ type = (unsigned int) ((unsigned long) node & JA_TYPE_MASK);
+ assert(type < (1UL << JA_TYPE_BITS));
+ return type;
+}
+
+__attribute__((visibility("protected")))
+void rcuja_free_all_children(struct cds_ja_shadow_node *shadow_node,
+ struct cds_ja_inode_flag *node_flag,
+ void (*free_node_cb)(struct rcu_head *head));
+
__attribute__((visibility("protected")))
struct cds_ja_shadow_node *rcuja_shadow_lookup_lock(struct cds_lfht *ht,
- struct cds_ja_inode *node);
+ struct cds_ja_inode_flag *node_flag);
__attribute__((visibility("protected")))
void rcuja_shadow_unlock(struct cds_ja_shadow_node *shadow_node);
__attribute__((visibility("protected")))
struct cds_ja_shadow_node *rcuja_shadow_set(struct cds_lfht *ht,
- struct cds_ja_inode *new_node,
- struct cds_ja_shadow_node *inherit_from);
+ struct cds_ja_inode_flag *new_node_flag,
+ struct cds_ja_shadow_node *inherit_from,
+ struct cds_ja *ja);
/* rcuja_shadow_clear flags */
enum {
__attribute__((visibility("protected")))
int rcuja_shadow_clear(struct cds_lfht *ht,
- struct cds_ja_inode *node,
+ struct cds_ja_inode_flag *node_flag,
struct cds_ja_shadow_node *shadow_node,
unsigned int flags);
__attribute__((visibility("protected")))
void rcuja_shadow_prune(struct cds_lfht *ht,
- unsigned int flags);
+ unsigned int flags,
+ void (*free_node_cb)(struct rcu_head *head));
__attribute__((visibility("protected")))
struct cds_lfht *rcuja_create_ht(const struct rcu_flavor_struct *flavor);
__attribute__((visibility("protected")))
int rcuja_delete_ht(struct cds_lfht *ht);
-#define DEBUG
+//#define DEBUG
+
+#ifdef __linux__
+#include <syscall.h>
+#endif
+
+#if defined(_syscall0)
+_syscall0(pid_t, gettid)
+#elif defined(__NR_gettid)
+static inline pid_t gettid(void)
+{
+ return syscall(__NR_gettid);
+}
+#else
+#warning "use pid as tid"
+static inline pid_t gettid(void)
+{
+ return getpid();
+}
+#endif
#ifdef DEBUG
-#define dbg_printf(fmt, args...) printf("[debug rcuja] " fmt, ## args)
+#define dbg_printf(fmt, args...) \
+ fprintf(stderr, "[debug rcuja %lu %s()@%s:%u] " fmt, \
+ (unsigned long) gettid(), __func__, \
+ __FILE__, __LINE__, ## args)
#else
#define dbg_printf(fmt, args...) \
do { \
/* do nothing but check printf format */ \
if (0) \
- printf("[debug rcuja] " fmt, ## args); \
+ fprintf(stderr, "[debug rcuja %lu %s()@%s:%u] " fmt, \
+ (unsigned long) gettid(), __func__, \
+ __FILE__, __LINE__, ## args); \
} while (0)
#endif
projects / userspace-rcu.git / blobdiff