Imported Upstream version 1.2.0upstream/1.2.0

1 files changed, 178 insertions, 67 deletions

diff --git a/src/dictionary.c b/src/dictionary.c
index 31f4d52e..1543f4d0 100644
--- a/src/dictionary.c
+++ b/src/dictionary.c
@@ -1,6 +1,7 @@
 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif
+
 #include <pthread.h>
 #include <stdlib.h>
 #include <string.h>
@@ -12,9 +13,32 @@
 #include "dictionary.h"
 
 // ----------------------------------------------------------------------------
-// name_value index
+// dictionary locks
 
-static int name_value_iterator(avl *a) { if(a) {}; return 0; }
+static inline void dictionary_read_lock(DICTIONARY *dict) {
+	if(likely(!(dict->flags & DICTIONARY_FLAG_SINGLE_THREADED))) {
+		// debug(D_DICTIONARY, "Dictionary READ lock");
+		pthread_rwlock_rdlock(&dict->rwlock);
+	}
+}
+
+static inline void dictionary_write_lock(DICTIONARY *dict) {
+	if(likely(!(dict->flags & DICTIONARY_FLAG_SINGLE_THREADED))) {
+		// debug(D_DICTIONARY, "Dictionary WRITE lock");
+		pthread_rwlock_wrlock(&dict->rwlock);
+	}
+}
+
+static inline void dictionary_unlock(DICTIONARY *dict) {
+	if(likely(!(dict->flags & DICTIONARY_FLAG_SINGLE_THREADED))) {
+		// debug(D_DICTIONARY, "Dictionary UNLOCK lock");
+		pthread_rwlock_unlock(&dict->rwlock);
+	}
+}
+
+
+// ----------------------------------------------------------------------------
+// avl index
 
 static int name_value_compare(void* a, void* b) {
 	if(((NAME_VALUE *)a)->hash < ((NAME_VALUE *)b)->hash) return -1;
@@ -22,93 +46,100 @@ static int name_value_compare(void* a, void* b) {
 	else return strcmp(((NAME_VALUE *)a)->name, ((NAME_VALUE *)b)->name);
 }
 
-#define name_value_index_add(dict, cv) avl_insert(&((dict)->values_index), (avl *)(cv))
-#define name_value_index_del(dict, cv) avl_remove(&((dict)->values_index), (avl *)(cv))
+#define dictionary_name_value_index_add_nolock(dict, nv) do { (dict)->inserts++; avl_insert(&((dict)->values_index), (avl *)(nv)); } while(0)
+#define dictionary_name_value_index_del_nolock(dict, nv) do { (dict)->deletes++; avl_remove(&(dict->values_index), (avl *)(nv)); } while(0)
 
-static NAME_VALUE *dictionary_name_value_index_find(DICTIONARY *dict, const char *name, uint32_t hash) {
-	NAME_VALUE *result = NULL, tmp;
+static inline NAME_VALUE *dictionary_name_value_index_find_nolock(DICTIONARY *dict, const char *name, uint32_t hash) {
+	NAME_VALUE tmp;
 	tmp.hash = (hash)?hash:simple_hash(name);
 	tmp.name = (char *)name;
 
-	avl_search(&(dict->values_index), (avl *)&tmp, name_value_iterator, (avl **)&result);
-	return result;
+	dict->searches++;
+	return (NAME_VALUE *)avl_search(&(dict->values_index), (avl *) &tmp);
 }
 
 // ----------------------------------------------------------------------------
+// internal methods
 
-static NAME_VALUE *dictionary_name_value_create(DICTIONARY *dict, const char *name, void *value, size_t value_len) {
-	debug(D_DICTIONARY, "Creating name value entry for name '%s', value '%s'.", name, value);
+static NAME_VALUE *dictionary_name_value_create_nolock(DICTIONARY *dict, const char *name, void *value, size_t value_len, uint32_t hash) {
+	debug(D_DICTIONARY, "Creating name value entry for name '%s'.", name);
 
 	NAME_VALUE *nv = calloc(1, sizeof(NAME_VALUE));
-	if(!nv) {
-		fatal("Cannot allocate name_value of size %z", sizeof(NAME_VALUE));
-		exit(1);
+	if(unlikely(!nv)) fatal("Cannot allocate name_value of size %z", sizeof(NAME_VALUE));
+
+	if(dict->flags & DICTIONARY_FLAG_NAME_LINK_DONT_CLONE)
+		nv->name = (char *)name;
+	else {
+		nv->name = strdup(name);
+		if (unlikely(!nv->name))
+			fatal("Cannot allocate name_value.name of size %z", strlen(name));
 	}
 
-	nv->name = strdup(name);
-	if(!nv->name) fatal("Cannot allocate name_value.name of size %z", strlen(name));
-	nv->hash = simple_hash(nv->name);
+	nv->hash = (hash)?hash:simple_hash(nv->name);
 
-	nv->value = malloc(value_len);
-	if(!nv->value) fatal("Cannot allocate name_value.value of size %z", value_len);
-	memcpy(nv->value, value, value_len);
+	if(dict->flags & DICTIONARY_FLAG_VALUE_LINK_DONT_CLONE)
+		nv->value = value;
+	else {
+		nv->value = malloc(value_len);
+		if (unlikely(!nv->value))
+			fatal("Cannot allocate name_value.value of size %z", value_len);
 
-	// link it
-	pthread_rwlock_wrlock(&dict->rwlock);
-	nv->next = dict->values;
-	dict->values = nv;
-	pthread_rwlock_unlock(&dict->rwlock);
+		memcpy(nv->value, value, value_len);
+	}
 
 	// index it
-	name_value_index_add(dict, nv);
+	dictionary_name_value_index_add_nolock(dict, nv);
+	dict->entries++;
 
 	return nv;
 }
 
-static void dictionary_name_value_destroy(DICTIONARY *dict, NAME_VALUE *nv) {
+static void dictionary_name_value_destroy_nolock(DICTIONARY *dict, NAME_VALUE *nv) {
 	debug(D_DICTIONARY, "Destroying name value entry for name '%s'.", nv->name);
 
-	pthread_rwlock_wrlock(&dict->rwlock);
-	if(dict->values == nv) dict->values = nv->next;
-	else {
-		NAME_VALUE *n = dict->values;
-		while(n && n->next && n->next != nv) nv = nv->next;
-		if(!n || n->next != nv) {
-			fatal("Cannot find name_value with name '%s' in dictionary.", nv->name);
-			exit(1);
-		}
-		n->next = nv->next;
-		nv->next = NULL;
+	dictionary_name_value_index_del_nolock(dict, nv);
+
+	dict->entries--;
+
+	if(!(dict->flags & DICTIONARY_FLAG_VALUE_LINK_DONT_CLONE)) {
+		debug(D_REGISTRY, "Dictionary freeing value of '%s'", nv->name);
+		free(nv->value);
+	}
+
+	if(!(dict->flags & DICTIONARY_FLAG_NAME_LINK_DONT_CLONE)) {
+		debug(D_REGISTRY, "Dictionary freeing name '%s'", nv->name);
+		free(nv->name);
 	}
-	pthread_rwlock_unlock(&dict->rwlock);
 
-	free(nv->value);
 	free(nv);
 }
 
 // ----------------------------------------------------------------------------
+// API - basic methods
 
-DICTIONARY *dictionary_create(void) {
+DICTIONARY *dictionary_create(uint32_t flags) {
 	debug(D_DICTIONARY, "Creating dictionary.");
 
 	DICTIONARY *dict = calloc(1, sizeof(DICTIONARY));
-	if(!dict) {
-		fatal("Cannot allocate DICTIONARY");
-		exit(1);
-	}
+	if(unlikely(!dict)) fatal("Cannot allocate DICTIONARY");
 
 	avl_init(&dict->values_index, name_value_compare);
 	pthread_rwlock_init(&dict->rwlock, NULL);
 
+	dict->flags = flags;
+
 	return dict;
 }
 
 void dictionary_destroy(DICTIONARY *dict) {
 	debug(D_DICTIONARY, "Destroying dictionary.");
 
-	pthread_rwlock_wrlock(&dict->rwlock);
-	while(dict->values) dictionary_name_value_destroy(dict, dict->values);
-	pthread_rwlock_unlock(&dict->rwlock);
+	dictionary_write_lock(dict);
+
+	while(dict->values_index.root)
+		dictionary_name_value_destroy_nolock(dict, (NAME_VALUE *)dict->values_index.root);
+
+	dictionary_unlock(dict);
 
 	free(dict);
 }
@@ -118,39 +149,55 @@ void dictionary_destroy(DICTIONARY *dict) {
 void *dictionary_set(DICTIONARY *dict, const char *name, void *value, size_t value_len) {
 	debug(D_DICTIONARY, "SET dictionary entry with name '%s'.", name);
 
-	pthread_rwlock_rdlock(&dict->rwlock);
-	NAME_VALUE *nv = dictionary_name_value_index_find(dict, name, 0);
-	pthread_rwlock_unlock(&dict->rwlock);
-	if(!nv) {
+	uint32_t hash = simple_hash(name);
+
+	dictionary_write_lock(dict);
+
+	NAME_VALUE *nv = dictionary_name_value_index_find_nolock(dict, name, hash);
+	if(unlikely(!nv)) {
 		debug(D_DICTIONARY, "Dictionary entry with name '%s' not found. Creating a new one.", name);
-		nv = dictionary_name_value_create(dict, name, value, value_len);
-		if(!nv) {
+
+		nv = dictionary_name_value_create_nolock(dict, name, value, value_len, hash);
+		if(unlikely(!nv))
 			fatal("Cannot create name_value.");
-			exit(1);
-		}
-		return nv->value;
 	}
 	else {
 		debug(D_DICTIONARY, "Dictionary entry with name '%s' found. Changing its value.", name);
-		pthread_rwlock_wrlock(&dict->rwlock);
-		void *old = nv->value;
-		nv->value = malloc(value_len);
-		if(!nv->value) fatal("Cannot allocate value of size %z", value_len);
-		memcpy(nv->value, value, value_len);
-		pthread_rwlock_unlock(&dict->rwlock);
-		free(old);
+
+		if(dict->flags & DICTIONARY_FLAG_VALUE_LINK_DONT_CLONE) {
+			debug(D_REGISTRY, "Dictionary: linking value to '%s'", name);
+			nv->value = value;
+		}
+		else {
+			debug(D_REGISTRY, "Dictionary: cloning value to '%s'", name);
+
+			void *value = malloc(value_len),
+					*old = nv->value;
+
+			if(unlikely(!nv->value))
+				fatal("Cannot allocate value of size %z", value_len);
+
+			memcpy(value, value, value_len);
+			nv->value = value;
+
+			debug(D_REGISTRY, "Dictionary: freeing old value of '%s'", name);
+			free(old);
+		}
 	}
 
+	dictionary_unlock(dict);
+
 	return nv->value;
 }
 
 void *dictionary_get(DICTIONARY *dict, const char *name) {
 	debug(D_DICTIONARY, "GET dictionary entry with name '%s'.", name);
 
-	pthread_rwlock_rdlock(&dict->rwlock);
-	NAME_VALUE *nv = dictionary_name_value_index_find(dict, name, 0);
-	pthread_rwlock_unlock(&dict->rwlock);
-	if(!nv) {
+	dictionary_read_lock(dict);
+	NAME_VALUE *nv = dictionary_name_value_index_find_nolock(dict, name, 0);
+	dictionary_unlock(dict);
+
+	if(unlikely(!nv)) {
 		debug(D_DICTIONARY, "Not found dictionary entry with name '%s'.", name);
 		return NULL;
 	}
@@ -158,3 +205,67 @@ void *dictionary_get(DICTIONARY *dict, const char *name) {
 	debug(D_DICTIONARY, "Found dictionary entry with name '%s'.", name);
 	return nv->value;
 }
+
+int dictionary_del(DICTIONARY *dict, const char *name) {
+	int ret;
+
+	debug(D_DICTIONARY, "DEL dictionary entry with name '%s'.", name);
+
+	dictionary_write_lock(dict);
+
+	NAME_VALUE *nv = dictionary_name_value_index_find_nolock(dict, name, 0);
+	if(unlikely(!nv)) {
+		debug(D_DICTIONARY, "Not found dictionary entry with name '%s'.", name);
+		ret = -1;
+	}
+	else {
+		debug(D_DICTIONARY, "Found dictionary entry with name '%s'.", name);
+		dictionary_name_value_destroy_nolock(dict, nv);
+		ret = 0;
+	}
+
+	dictionary_unlock(dict);
+
+	return ret;
+}
+
+
+// ----------------------------------------------------------------------------
+// API - walk through the dictionary
+// the dictionary is locked for reading while this happens
+// do not user other dictionary calls while walking the dictionary - deadlock!
+
+static int dictionary_walker(avl *a, int (*callback)(void *entry, void *data), void *data) {
+	int total = 0, ret = 0;
+
+	if(a->right) {
+		ret = dictionary_walker(a->right, callback, data);
+		if(ret < 0) return ret;
+		total += ret;
+	}
+
+	ret = callback(((NAME_VALUE *)a)->value, data);
+	if(ret < 0) return ret;
+	total += ret;
+
+	if(a->left) {
+		dictionary_walker(a->left, callback, data);
+		if (ret < 0) return ret;
+		total += ret;
+	}
+
+	return total;
+}
+
+int dictionary_get_all(DICTIONARY *dict, int (*callback)(void *entry, void *data), void *data) {
+	int ret = 0;
+
+	dictionary_read_lock(dict);
+
+	if(likely(dict->values_index.root))
+		ret = dictionary_walker(dict->values_index.root, callback, data);
+
+	dictionary_unlock(dict);
+
+	return ret;
+}