threading: shrink and reorganize TmSlot

src/tm-threads.c

@@ -785,12 +785,15 @@ void TmSlotSetFuncAppend(ThreadVars *tv, TmModule *tm, const void *data)
         return;
     memset(slot, 0, sizeof(TmSlot));
     SC_ATOMIC_INIT(slot->slot_data);
-    slot->tv = tv;
     slot->SlotThreadInit = tm->ThreadInit;
     slot->slot_initdata = data;
-    slot->SlotFunc = tm->Func;
-    slot->PktAcqLoop = tm->PktAcqLoop;
-    slot->Management = tm->Management;
+    if (tm->Func) {
+        slot->SlotFunc = tm->Func;
+    } else if (tm->PktAcqLoop) {
+        slot->PktAcqLoop = tm->PktAcqLoop;
+    } else if (tm->Management) {
+        slot->Management = tm->Management;
+    }
     slot->SlotThreadExitPrintStats = tm->ThreadExitPrintStats;
     slot->SlotThreadDeinit = tm->ThreadDeinit;
     /* we don't have to check for the return value "-1".  We wouldn't have

src/tm-threads.h

@@ -50,13 +50,15 @@ static inline void SleepUsec(uint64_t usec)
 typedef TmEcode (*TmSlotFunc)(ThreadVars *, Packet *, void *, PacketQueue *);
 
 typedef struct TmSlot_ {
-    /* the TV holding this slot */
-    ThreadVars *tv;
-
     /* function pointers */
-    TmSlotFunc SlotFunc;
-
-    TmEcode (*PktAcqLoop)(ThreadVars *, void *, void *);
+    union {
+        TmSlotFunc SlotFunc;
+        TmEcode (*PktAcqLoop)(ThreadVars *, void *, void *);
+        TmEcode (*Management)(ThreadVars *, void *);
+    };
+    /** linked list of slots, used when a pipeline has multiple slots
+     *  in a single thread. */
+    struct TmSlot_ *slot_next;
 
     TmEcode (*SlotThreadInit)(ThreadVars *, const void *, void **);
     void (*SlotThreadExitPrintStats)(ThreadVars *, void *);
@@ -77,12 +79,6 @@ typedef struct TmSlot_ {
     /* slot id, only used my TmVarSlot to know what the first slot is */
     int id;
 
-    /* linked list, only used when you have multiple slots(used by TmVarSlot) */
-    struct TmSlot_ *slot_next;
-
-    /* just called once, so not perf critical */
-    TmEcode (*Management)(ThreadVars *, void *);
-
 } TmSlot;
 
 extern ThreadVars *tv_root[TVT_MAX];