Use extra field for adapter-specific data

This makes sure that the "data" field on the asynchronous context can be
used for user-specific data.

adapters/ae.h

@@ -72,7 +72,7 @@ int redisAeAttach(aeEventLoop *loop, redisAsyncContext *ac) {
     redisAeEvents *e;
 
     /* Nothing should be attached when something is already attached */
-    if (ac->data != NULL)
+    if (ac->_adapter_data != NULL)
         return REDIS_ERR;
 
     /* Create container for context and r/w events */
@@ -88,7 +88,7 @@ int redisAeAttach(aeEventLoop *loop, redisAsyncContext *ac) {
     ac->evAddWrite = redisAeAddWrite;
     ac->evDelWrite = redisAeDelWrite;
     ac->evCleanup = redisAeCleanup;
-    ac->data = e;
+    ac->_adapter_data = e;
 
     return REDIS_OK;
 }

adapters/libev.h

@@ -82,7 +82,7 @@ int redisLibevAttach(EV_P_ redisAsyncContext *ac) {
     redisLibevEvents *e;
 
     /* Nothing should be attached when something is already attached */
-    if (ac->data != NULL)
+    if (ac->_adapter_data != NULL)
         return REDIS_ERR;
 
     /* Create container for context and r/w events */
@@ -103,7 +103,7 @@ int redisLibevAttach(EV_P_ redisAsyncContext *ac) {
     ac->evAddWrite = redisLibevAddWrite;
     ac->evDelWrite = redisLibevDelWrite;
     ac->evCleanup = redisLibevCleanup;
-    ac->data = e;
+    ac->_adapter_data = e;
 
     /* Initialize read/write events */
     ev_io_init(&e->rev,redisLibevReadEvent,c->fd,EV_READ);

adapters/libevent.h

@@ -52,7 +52,7 @@ int redisLibeventAttach(redisAsyncContext *ac, struct event_base *base) {
     redisLibeventEvents *e;
 
     /* Nothing should be attached when something is already attached */
-    if (ac->data != NULL)
+    if (ac->_adapter_data != NULL)
         return REDIS_ERR;
 
     /* Create container for context and r/w events */
@@ -65,7 +65,7 @@ int redisLibeventAttach(redisAsyncContext *ac, struct event_base *base) {
     ac->evAddWrite = redisLibeventAddWrite;
     ac->evDelWrite = redisLibeventDelWrite;
     ac->evCleanup = redisLibeventCleanup;
-    ac->data = e;
+    ac->_adapter_data = e;
 
     /* Initialize and install read/write events */
     event_set(&e->rev,c->fd,EV_READ,redisLibeventReadEvent,e);

async.c

@@ -41,6 +41,7 @@ static redisAsyncContext *redisAsyncInitialize(redisContext *c) {
     ac->err = 0;
     ac->errstr = NULL;
     ac->data = NULL;
+    ac->_adapter_data = NULL;
     ac->evAddRead = NULL;
     ac->evDelRead = NULL;
     ac->evAddWrite = NULL;
@@ -162,7 +163,7 @@ static void __redisAsyncDisconnect(redisAsyncContext *ac) {
     }
 
     /* Signal event lib to clean up */
-    if (ac->evCleanup) ac->evCleanup(ac->data);
+    if (ac->evCleanup) ac->evCleanup(ac->_adapter_data);
 
     /* Execute callback with proper status */
     if (ac->onDisconnect) ac->onDisconnect(ac,status);
@@ -215,7 +216,7 @@ void redisAsyncHandleRead(redisAsyncContext *ac) {
         __redisAsyncDisconnect(ac);
     } else {
         /* Always re-schedule reads */
-        if (ac->evAddRead) ac->evAddRead(ac->data);
+        if (ac->evAddRead) ac->evAddRead(ac->_adapter_data);
         redisProcessCallbacks(ac);
     }
 }
@@ -229,13 +230,13 @@ void redisAsyncHandleWrite(redisAsyncContext *ac) {
     } else {
         /* Continue writing when not done, stop writing otherwise */
         if (!done) {
-            if (ac->evAddWrite) ac->evAddWrite(ac->data);
+            if (ac->evAddWrite) ac->evAddWrite(ac->_adapter_data);
         } else {
-            if (ac->evDelWrite) ac->evDelWrite(ac->data);
+            if (ac->evDelWrite) ac->evDelWrite(ac->_adapter_data);
         }
 
         /* Always schedule reads when something was written */
-        if (ac->evAddRead) ac->evAddRead(ac->data);
+        if (ac->evAddRead) ac->evAddRead(ac->_adapter_data);
     }
 }
 
@@ -258,7 +259,7 @@ static int __redisAsyncCommand(redisAsyncContext *ac, redisCallbackFn *fn, void
     __redisPushCallback(&ac->replies,&cb);
 
     /* Always schedule a write when the write buffer is non-empty */
-    if (ac->evAddWrite) ac->evAddWrite(ac->data);
+    if (ac->evAddWrite) ac->evAddWrite(ac->_adapter_data);
 
     return REDIS_OK;
 }

async.h

@@ -65,6 +65,9 @@ typedef struct redisAsyncContext {
     /* Not used by hiredis */
     void *data;
 
+    /* Used by the different event lib adapters to store their private data */
+    void *_adapter_data;
+
     /* Called when the library expects to start reading/writing.
      * The supplied functions should be idempotent. */
     void (*evAddRead)(void *privdata);