top level make clean also clean hiredis and linoise (deps)

[redis.git] / src / object.c

diff --git a/src/object.c b/src/object.c
index 16c4d74c95bb25b6d4a836b63a87a97997037b17..b1eae96329ebe59a4cdc7366d8ca0d393ed27761 100644 (file)
--- a/src/object.c
+++ b/src/object.c
@@ -1,5 +1,6 @@
 #include "redis.h"
 #include <pthread.h>
+#include <math.h>
 
 robj *createObject(int type, void *ptr) {
     robj *o;
@@ -11,22 +12,26 @@ robj *createObject(int type, void *ptr) {
         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);
+        if (server.vm_enabled) pthread_mutex_unlock(&server.obj_freelist_mutex);
         o = zmalloc(sizeof(*o));
     }
     o->type = type;
     o->encoding = REDIS_ENCODING_RAW;
     o->ptr = ptr;
     o->refcount = 1;
-    if (server.vm_enabled) {
-        /* Note that this code may run in the context of an I/O thread
-         * and accessing server.lruclock in theory is an error
-         * (no locks). But in practice this is safe, and even if we read
-         * garbage Redis will not fail. */
-        o->lru = server.lruclock;
-        o->storage = REDIS_VM_MEMORY;
-    }
+    /* 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.
+     *
+     * Note that this code may run in the context of an I/O thread
+     * and accessing server.lruclock in theory is an error
+     * (no locks). But in practice this is safe, and even if we read
+     * garbage Redis will not fail. */
+    o->lru = server.lruclock;
+    /* 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;
 }
 
@@ -36,7 +41,8 @@ robj *createStringObject(char *ptr, size_t len) {
 
 robj *createStringObjectFromLongLong(long long value) {
     robj *o;
-    if (value >= 0 && value < REDIS_SHARED_INTEGERS) {
+    if (value >= 0 && value < REDIS_SHARED_INTEGERS &&
+        pthread_equal(pthread_self(),server.mainthread)) {
         incrRefCount(shared.integers[value]);
         o = shared.integers[value];
     } else {
@@ -197,6 +203,7 @@ void decrRefCount(void *obj) {
         case REDIS_HASH: freeHashObject(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))
@@ -232,8 +239,19 @@ robj *tryObjectEncoding(robj *o) {
     /* Check if we can represent this string as a long integer */
     if (isStringRepresentableAsLong(s,&value) == REDIS_ERR) return o;
 
-    /* Ok, this object can be encoded */
-    if (value >= 0 && value < REDIS_SHARED_INTEGERS) {
+    /* 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).
+     *
+     * Note that we also avoid using shared integers when maxmemory is used
+     * because very object needs to have a private LRU field for the LRU
+     * algorithm to work well. */
+    if (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];
@@ -329,7 +347,7 @@ int getDoubleFromObject(robj *o, double *target) {
         redisAssert(o->type == REDIS_STRING);
         if (o->encoding == REDIS_ENCODING_RAW) {
             value = strtod(o->ptr, &eptr);
-            if (eptr[0] != '\0') return REDIS_ERR;
+            if (eptr[0] != '\0' || isnan(value)) return REDIS_ERR;
         } else if (o->encoding == REDIS_ENCODING_INT) {
             value = (long)o->ptr;
         } else {
@@ -345,9 +363,9 @@ int getDoubleFromObjectOrReply(redisClient *c, robj *o, double *target, const ch
     double value;
     if (getDoubleFromObject(o, &value) != REDIS_OK) {
         if (msg != NULL) {
-            addReplySds(c, sdscatprintf(sdsempty(), "-ERR %s\r\n", msg));
+            addReplyError(c,(char*)msg);
         } else {
-            addReplySds(c, sdsnew("-ERR value is not a double\r\n"));
+            addReplyError(c,"value is not a double");
         }
         return REDIS_ERR;
     }
@@ -367,6 +385,8 @@ int getLongLongFromObject(robj *o, long long *target) {
         if (o->encoding == REDIS_ENCODING_RAW) {
             value = strtoll(o->ptr, &eptr, 10);
             if (eptr[0] != '\0') return REDIS_ERR;
+            if (errno == ERANGE && (value == LLONG_MIN || value == LLONG_MAX))
+                return REDIS_ERR;
         } else if (o->encoding == REDIS_ENCODING_INT) {
             value = (long)o->ptr;
         } else {
@@ -382,9 +402,9 @@ int getLongLongFromObjectOrReply(redisClient *c, robj *o, long long *target, con
     long long value;
     if (getLongLongFromObject(o, &value) != REDIS_OK) {
         if (msg != NULL) {
-            addReplySds(c, sdscatprintf(sdsempty(), "-ERR %s\r\n", msg));
+            addReplyError(c,(char*)msg);
         } else {
-            addReplySds(c, sdsnew("-ERR value is not an integer\r\n"));
+            addReplyError(c,"value is not an integer or out of range");
         }
         return REDIS_ERR;
     }
@@ -399,9 +419,9 @@ int getLongFromObjectOrReply(redisClient *c, robj *o, long *target, const char *
     if (getLongLongFromObjectOrReply(c, o, &value, msg) != REDIS_OK) return REDIS_ERR;
     if (value < LONG_MIN || value > LONG_MAX) {
         if (msg != NULL) {
-            addReplySds(c, sdscatprintf(sdsempty(), "-ERR %s\r\n", msg));
+            addReplyError(c,(char*)msg);
         } else {
-            addReplySds(c, sdsnew("-ERR value is out of range\r\n"));
+            addReplyError(c,"value is out of range");
         }
         return REDIS_ERR;
     }
@@ -422,3 +442,14 @@ char *strEncoding(int encoding) {
     default: return "unknown";
     }
 }
+
+/* Given an object returns the min number of seconds the object was never
+ * requested, using an approximated LRU algorithm. */
+unsigned long estimateObjectIdleTime(robj *o) {
+    if (server.lruclock >= o->lru) {
+        return (server.lruclock - o->lru) * REDIS_LRU_CLOCK_RESOLUTION;
+    } else {
+        return ((REDIS_LRU_CLOCK_MAX - o->lru) + server.lruclock) *
+                    REDIS_LRU_CLOCK_RESOLUTION;
+    }
+}