diff --git a/ww/master_pool.c b/ww/master_pool.c
index e3105b7..65a742c 100644
--- a/ww/master_pool.c
+++ b/ww/master_pool.c
@@ -1,18 +1,7 @@
 #include "master_pool.h"
 
-static void poolFirstCharge(master_pool_t *pool)
-{
-    hhybridmutex_lock(&(pool->mutex));
-    pool->len = pool->cap / 2;
-    for (size_t i = 0; i < pool->len; i++)
-    {
-        pool->available[i] = pool->create_item_handle(pool);
-    }
-    hhybridmutex_unlock(&(pool->mutex));
-}
-
-master_pool_t *newMasterPoolWithCap(unsigned int pool_width, MasterPoolItemCreateHandle create_h,
-                                    MasterPoolItemDestroyHandle destroy_h)
+master_pool_t *newMasterPoolWithCap(unsigned int pool_width, MasterPoolItemCreateHandle const create_h,
+                                    MasterPoolItemDestroyHandle const destroy_h)
 {
 
     pool_width = (max(1, pool_width) + 15) & ~0x0F;
@@ -45,11 +34,14 @@ master_pool_t *newMasterPoolWithCap(unsigned int pool_width, MasterPoolItemCreat
     memset(pool_ptr, 0xEB, sizeof(master_pool_t) + container_len);
 #endif
 
-    master_pool_t pool = {
-        .memptr = pool_ptr, .cap = pool_width, .create_item_handle = create_h, .destroy_item_handle = destroy_h};
+    master_pool_t pool = {.memptr              = pool_ptr,
+                          .cap                 = pool_width,
+                          .len                 = 0,
+                          .create_item_handle  = create_h,
+                          .destroy_item_handle = destroy_h};
 
     memcpy(pool_ptr, &pool, sizeof(master_pool_t));
     hhybridmutex_init(&(pool_ptr->mutex));
-    poolFirstCharge(pool_ptr);
+
     return pool_ptr;
 }
diff --git a/ww/master_pool.h b/ww/master_pool.h
index 9709510..a3832fa 100644
--- a/ww/master_pool.h
+++ b/ww/master_pool.h
@@ -4,15 +4,30 @@
 #include "utils/mathutils.h"
 #include "ww.h"
 
+/*
+    Master Pool
+
+    In some cases, workers need to send data/buffers to each other, while each have a thread local pool
+
+    therefore, thread local pools may keep running out of items, and there is a need for a thread-safe-pool
+
+    thread local pools will fall back to the master pool instead of allocating more memory or freeing it and
+    interacting with os, malloc,free; in a single batch allocation for a full charge with only 1 mutex lock
+
+
+
+*/
+
 struct master_pool_s;
 typedef void master_pool_item_t;
 
-typedef master_pool_item_t *(*MasterPoolItemCreateHandle)(struct master_pool_s *pool);
-typedef void (*MasterPoolItemDestroyHandle)(struct master_pool_s *pool, master_pool_item_t *item);
+typedef master_pool_item_t *(*MasterPoolItemCreateHandle)(struct master_pool_s *pool,void* userdata);
+typedef void (*MasterPoolItemDestroyHandle)(struct master_pool_s *pool, master_pool_item_t *item,void* userdata);
 
 /*
     do not read this pool properties from the struct, its a multi-threaded object
 */
+
 typedef struct master_pool_s
 {
     void                       *memptr;
@@ -20,11 +35,12 @@ typedef struct master_pool_s
     MasterPoolItemCreateHandle  create_item_handle;
     MasterPoolItemDestroyHandle destroy_item_handle;
     atomic_uint                 len;
-    unsigned int                cap; // fixed
+    const unsigned int          cap;
     void                       *available[];
 } master_pool_t;
 
-static inline void popMasterPoolItems(master_pool_t *pool, master_pool_item_t **iptr, unsigned int count)
+static inline void popMasterPoolItems(master_pool_t *const pool, master_pool_item_t const **const iptr,
+                                      const unsigned int count,void* userdata)
 {
 
     if (atomic_load_explicit(&(pool->len), memory_order_relaxed) > 0)
@@ -36,36 +52,39 @@ static inline void popMasterPoolItems(master_pool_t *pool, master_pool_item_t **
         {
             atomic_fetch_add_explicit(&(pool->len), -consumed, memory_order_relaxed);
             const unsigned int pbase = (tmp_len - consumed);
-            unsigned int i = 0;
+            unsigned int       i     = 0;
             for (; i < consumed; i++)
             {
                 iptr[i] = pool->available[pbase + i];
             }
             for (; i < count; i++)
             {
-                iptr[i] = pool->create_item_handle(pool);
+                iptr[i] = pool->create_item_handle(pool,userdata);
             }
         }
 
         hhybridmutex_unlock(&(pool->mutex));
         return;
     }
+
     for (unsigned int i = 0; i < count; i++)
     {
-        iptr[i] = pool->create_item_handle(pool);
+        iptr[i] = pool->create_item_handle(pool,userdata);
     }
 }
 
-static inline void reuseMasterPoolItems(master_pool_t *pool, master_pool_item_t **iptr, unsigned int count)
+static inline void reuseMasterPoolItems(master_pool_t *const pool, master_pool_item_t **const iptr,
+                                        const unsigned int count,void* userdata)
 {
     if (pool->cap - atomic_load_explicit(&(pool->len), memory_order_relaxed) == 0)
     {
         for (unsigned int i = 0; i < count; i++)
         {
-            pool->destroy_item_handle(pool, iptr[i]);
+            pool->destroy_item_handle(pool, iptr[i],userdata);
         }
         return;
     }
+
     hhybridmutex_lock(&(pool->mutex));
 
     const unsigned int tmp_len  = atomic_load_explicit(&(pool->len), memory_order_relaxed);
@@ -82,9 +101,10 @@ static inline void reuseMasterPoolItems(master_pool_t *pool, master_pool_item_t
         }
         for (; i < count; i++)
         {
-            pool->destroy_item_handle(pool, iptr[i]);
+            pool->destroy_item_handle(pool, iptr[i],userdata);
         }
     }
+
     hhybridmutex_unlock(&(pool->mutex));
 }