#include <math.h>
robj *createObject(int type, void *ptr) {
- robj *o;
-
- if (server.vm_enabled) pthread_mutex_lock(&server.obj_freelist_mutex);
- if (listLength(server.objfreelist)) {
- listNode *head = listFirst(server.objfreelist);
- o = listNodeValue(head);
- listDelNode(server.objfreelist,head);
- if (server.vm_enabled) pthread_mutex_unlock(&server.obj_freelist_mutex);
- } else {
- if (server.vm_enabled) pthread_mutex_unlock(&server.obj_freelist_mutex);
- o = zmalloc(sizeof(*o));
- }
+ robj *o = zmalloc(sizeof(*o));
o->type = type;
o->encoding = REDIS_ENCODING_RAW;
o->ptr = ptr;
o->refcount = 1;
+
/* Set the LRU to the current lruclock (minutes resolution).
* We do this regardless of the fact VM is active as LRU is also
* used for the maxmemory directive when Redis is used as cache.
/* The following is only needed if VM is active, but since the conditional
* is probably more costly than initializing the field it's better to
* have every field properly initialized anyway. */
- o->storage = REDIS_VM_MEMORY;
return o;
}
robj *createStringObjectFromLongLong(long long value) {
robj *o;
if (value >= 0 && value < REDIS_SHARED_INTEGERS &&
+ !server.ds_enabled &&
pthread_equal(pthread_self(),server.mainthread)) {
incrRefCount(shared.integers[value]);
o = shared.integers[value];
void decrRefCount(void *obj) {
robj *o = obj;
- /* Object is a swapped out value, or in the process of being loaded. */
- if (server.vm_enabled &&
- (o->storage == REDIS_VM_SWAPPED || o->storage == REDIS_VM_LOADING))
- {
- vmpointer *vp = obj;
- if (o->storage == REDIS_VM_LOADING) vmCancelThreadedIOJob(o);
- vmMarkPagesFree(vp->page,vp->usedpages);
- server.vm_stats_swapped_objects--;
- zfree(vp);
- return;
- }
-
if (o->refcount <= 0) redisPanic("decrRefCount against refcount <= 0");
- /* Object is in memory, or in the process of being swapped out.
- *
- * If the object is being swapped out, abort the operation on
- * decrRefCount even if the refcount does not drop to 0: the object
- * is referenced at least two times, as value of the key AND as
- * job->val in the iojob. So if we don't invalidate the iojob, when it is
- * done but the relevant key was removed in the meantime, the
- * complete jobs handler will not find the key about the job and the
- * assert will fail. */
- if (server.vm_enabled && o->storage == REDIS_VM_SWAPPING)
- vmCancelThreadedIOJob(o);
if (--(o->refcount) == 0) {
switch(o->type) {
case REDIS_STRING: freeStringObject(o); break;
default: redisPanic("Unknown object type"); break;
}
o->ptr = NULL; /* defensive programming. We'll see NULL in traces. */
- if (server.vm_enabled) pthread_mutex_lock(&server.obj_freelist_mutex);
- if (listLength(server.objfreelist) > REDIS_OBJFREELIST_MAX ||
- !listAddNodeHead(server.objfreelist,o))
- zfree(o);
- if (server.vm_enabled) pthread_mutex_unlock(&server.obj_freelist_mutex);
+ zfree(o);
}
}
/* Ok, this object can be encoded...
*
* Can I use a shared object? Only if the object is inside a given
- * range and if this is the main thread, since when VM is enabled we
- * have the constraint that I/O thread should only handle non-shared
- * objects, in order to avoid race conditions (we don't have per-object
- * locking). */
- if (value >= 0 && value < REDIS_SHARED_INTEGERS &&
- pthread_equal(pthread_self(),server.mainthread)) {
+ * range and if the back end in use is in-memory. For disk store every
+ * object in memory used as value should be independent.
+ *
+ * Note that we also avoid using shared integers when maxmemory is used
+ * because every object needs to have a private LRU field for the LRU
+ * algorithm to work well. */
+ if (!server.ds_enabled &&
+ server.maxmemory == 0 && value >= 0 && value < REDIS_SHARED_INTEGERS &&
+ pthread_equal(pthread_self(),server.mainthread))
+ {
decrRefCount(o);
incrRefCount(shared.integers[value]);
return shared.integers[value];
REDIS_LRU_CLOCK_RESOLUTION;
}
}
+
+/* This is an helper function for the DEBUG command. We need to lookup keys
+ * without any modification of LRU or other parameters. */
+robj *objectCommandLookup(redisClient *c, robj *key) {
+ dictEntry *de;
+
+ if ((de = dictFind(c->db->dict,key->ptr)) == NULL) return NULL;
+ return (robj*) dictGetEntryVal(de);
+}
+
+robj *objectCommandLookupOrReply(redisClient *c, robj *key, robj *reply) {
+ robj *o = objectCommandLookup(c,key);
+
+ if (!o) addReply(c, reply);
+ return o;
+}
+
+/* Object command allows to inspect the internals of an Redis Object.
+ * Usage: OBJECT <verb> ... arguments ... */
+void objectCommand(redisClient *c) {
+ robj *o;
+
+ if (!strcasecmp(c->argv[1]->ptr,"refcount") && c->argc == 3) {
+ if ((o = objectCommandLookupOrReply(c,c->argv[2],shared.nullbulk))
+ == NULL) return;
+ addReplyLongLong(c,o->refcount);
+ } else if (!strcasecmp(c->argv[1]->ptr,"encoding") && c->argc == 3) {
+ if ((o = objectCommandLookupOrReply(c,c->argv[2],shared.nullbulk))
+ == NULL) return;
+ addReplyBulkCString(c,strEncoding(o->encoding));
+ } else if (!strcasecmp(c->argv[1]->ptr,"idletime") && c->argc == 3) {
+ if ((o = objectCommandLookupOrReply(c,c->argv[2],shared.nullbulk))
+ == NULL) return;
+ addReplyLongLong(c,estimateObjectIdleTime(o));
+ } else {
+ addReplyError(c,"Syntax error. Try OBJECT (refcount|encoding|idletime)");
+ }
+}
+
projects / redis.git / blobdiff