From 0e5441d8161042493fcfdacaeed2a770f1f7285c Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Thu, 22 Jul 2010 13:08:02 +0200
Subject: [PATCH] don't use object sharing inside I/O threads, as a fix for a
 well known instability of VM introduced with the new object sharing code

---
 src/object.c | 11 +++++++++--
 src/redis.c  |  1 +
 src/redis.h  |  1 +
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/object.c b/src/object.c
index 772637ce..25567e2a 100644
--- a/src/object.c
+++ b/src/object.c
@@ -213,8 +213,15 @@ 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, sinc 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)) {
         decrRefCount(o);
         incrRefCount(shared.integers[value]);
         return shared.integers[value];
diff --git a/src/redis.c b/src/redis.c
index 86536b43..433eae37 100644
--- a/src/redis.c
+++ b/src/redis.c
@@ -760,6 +760,7 @@ void initServer() {
     signal(SIGPIPE, SIG_IGN);
     setupSigSegvAction();
 
+    server.mainthread = pthread_self();
     server.devnull = fopen("/dev/null","w");
     if (server.devnull == NULL) {
         redisLog(REDIS_WARNING, "Can't open /dev/null: %s", server.neterr);
diff --git a/src/redis.h b/src/redis.h
index 4ff83620..d5fabc2d 100644
--- a/src/redis.h
+++ b/src/redis.h
@@ -327,6 +327,7 @@ struct sharedObjectsStruct {
 
 /* Global server state structure */
 struct redisServer {
+    pthread_t mainthread;
     int port;
     int fd;
     redisDb *db;
-- 
2.45.2