diff --git a/HISTORY b/HISTORY
index 40174c1..42087ca 100644
--- a/HISTORY
+++ b/HISTORY
@@ -1,5 +1,5 @@
 
-Version 1.44  2020-07-20
+Version 1.44  2020-08-05
   * add test file src/tests/test_pthread_lock.c
   * add uniq_skiplist.[hc]
   * add function split_string_ex
diff --git a/src/shared_func.c b/src/shared_func.c
index 84e0adb..b19f152 100644
--- a/src/shared_func.c
+++ b/src/shared_func.c
@@ -2989,17 +2989,17 @@ int fc_delete_file_ex(const char *filename, const char *caption)
     return result;
 }
 
-bool fc_is_prime(const int n)
+bool fc_is_prime(const int64_t n)
 {
-    int loop;
-    int i;
+    int64_t loop;
+    int64_t i;
 
     if (n <= 0)
     {
         return false;
     }
 
-    loop = lround(sqrt((double)n));
+    loop = llround(sqrt((double)n));
     for (i=2; i<=loop; i++)
     {
         if (n % i == 0)
@@ -3011,10 +3011,10 @@ bool fc_is_prime(const int n)
     return true;
 }
 
-int fc_floor_prime(const int n)
+int64_t fc_floor_prime(const int64_t n)
 {
-    int start;
-    int i;
+    int64_t start;
+    int64_t i;
 
     start =  (n % 2 == 0 ? n - 1 : n);
     for (i = start; i > 0; i -= 2)
@@ -3028,9 +3028,9 @@ int fc_floor_prime(const int n)
     return 1;
 }
 
-int fc_ceil_prime(const int n)
+int64_t fc_ceil_prime(const int64_t n)
 {
-    int i;
+    int64_t i;
 
     if (n <= 0)
     {
diff --git a/src/shared_func.h b/src/shared_func.h
index f66540d..3031fa6 100644
--- a/src/shared_func.h
+++ b/src/shared_func.h
@@ -921,7 +921,7 @@ static inline int fc_delete_file(const char *filename)
  *  	n: the number to detect
  *  return: true for prime number, otherwise false
 */
-bool fc_is_prime(const int n);
+bool fc_is_prime(const int64_t n);
 
 
 /** find the largest prime number not greater than n
@@ -929,14 +929,14 @@ bool fc_is_prime(const int n);
  *  	n: the number to detect
  *  return: the largest prime number near n
 */
-int fc_floor_prime(const int n);
+int64_t fc_floor_prime(const int64_t n);
 
 /** find the smallest prime number not less than n
  *  parameters:
  *  	n: the number to detect
  *  return: the smallest prime number near n
 */
-int fc_ceil_prime(const int n);
+int64_t fc_ceil_prime(const int64_t n);
 
 /** init buffer
  *  parameters:
diff --git a/src/thread_pool.c b/src/thread_pool.c
index 0cd887f..64a0194 100644
--- a/src/thread_pool.c
+++ b/src/thread_pool.c
@@ -21,14 +21,18 @@ static void *thread_entrance(void *arg)
     thread = (FCThreadInfo *)arg;
     pool = thread->pool;
 
+    if (pool->extra_data_callbacks.alloc != NULL) {
+        thread->tdata = pool->extra_data_callbacks.alloc();
+    }
+
     PTHREAD_MUTEX_LOCK(&thread->lock);
     thread->inited = true;
     PTHREAD_MUTEX_UNLOCK(&thread->lock);
 
     PTHREAD_MUTEX_LOCK(&pool->lock);
     pool->thread_counts.running++;
-    logInfo("tindex: %d start, tcount: %d",
-            thread->index, pool->thread_counts.running);
+    logInfo("thread pool: %s, index: %d start, running count: %d",
+            pool->name, thread->index, pool->thread_counts.running);
     PTHREAD_MUTEX_UNLOCK(&pool->lock);
 
     running = true;
@@ -37,12 +41,12 @@ static void *thread_entrance(void *arg)
     while (running && *pool->pcontinue_flag) {
 
         PTHREAD_MUTEX_LOCK(&thread->lock);
-        if (thread->func == NULL) {
+        if (thread->callback.func == NULL) {
             ts.tv_sec = get_current_time() + 2;
             pthread_cond_timedwait(&thread->cond, &thread->lock, &ts);
         }
 
-        callback = thread->func;
+        callback = thread->callback.func;
         if (callback == NULL) {
             if (pool->max_idle_time > 0 && get_current_time() -
                     last_run_time > pool->max_idle_time)
@@ -59,13 +63,13 @@ static void *thread_entrance(void *arg)
                 PTHREAD_MUTEX_UNLOCK(&pool->lock);
             }
         } else {
-            thread->func = NULL;
+            thread->callback.func = NULL;
         }
         PTHREAD_MUTEX_UNLOCK(&thread->lock);
 
         if (callback != NULL) {
             __sync_add_and_fetch(&pool->thread_counts.dealing, 1);
-            callback(thread->arg);
+            callback(thread->callback.arg, thread->tdata);
             last_run_time = get_current_time();
             __sync_sub_and_fetch(&pool->thread_counts.dealing, 1);
 
@@ -80,6 +84,11 @@ static void *thread_entrance(void *arg)
         }
     }
 
+    if (pool->extra_data_callbacks.free != NULL && thread->tdata != NULL) {
+        pool->extra_data_callbacks.free(thread->tdata);
+        thread->tdata = NULL;
+    }
+
     if (running) {
         PTHREAD_MUTEX_LOCK(&thread->lock);
         thread->inited = false;
@@ -91,8 +100,8 @@ static void *thread_entrance(void *arg)
     }
 
     PTHREAD_MUTEX_LOCK(&pool->lock);
-    logInfo("tindex: %d exit, tcount: %d",
-            thread->index, pool->thread_counts.running);
+    logInfo("thread pool: %s, index: %d exit, running count: %d",
+            pool->name, thread->index, pool->thread_counts.running);
     PTHREAD_MUTEX_UNLOCK(&pool->lock);
 
     return NULL;
@@ -166,9 +175,10 @@ static int thread_pool_alloc_init(FCThreadPool *pool)
     return 0;
 }
 
-int fc_thread_pool_init(FCThreadPool *pool, const int limit,
-        const int stack_size, const int max_idle_time,
-        const int min_idle_count, bool * volatile pcontinue_flag)
+int fc_thread_pool_init_ex(FCThreadPool *pool, const char *name,
+        const int limit, const int stack_size, const int max_idle_time,
+        const int min_idle_count, bool * volatile pcontinue_flag,
+        FCThreadExtraDataCallbacks *extra_data_callbacks)
 {
     int result;
 
@@ -176,6 +186,7 @@ int fc_thread_pool_init(FCThreadPool *pool, const int limit,
         return result;
     }
 
+    snprintf(pool->name, sizeof(pool->name), "%s", name);
     pool->stack_size = stack_size;
     pool->max_idle_time = max_idle_time;
     if (min_idle_count > limit) {
@@ -187,6 +198,12 @@ int fc_thread_pool_init(FCThreadPool *pool, const int limit,
     pool->thread_counts.running = 0;
     pool->thread_counts.dealing = 0;
     pool->pcontinue_flag = pcontinue_flag;
+    if (extra_data_callbacks != NULL) {
+        pool->extra_data_callbacks = *extra_data_callbacks;
+    } else {
+        pool->extra_data_callbacks.alloc = NULL;
+        pool->extra_data_callbacks.free = NULL;
+    }
 
     return thread_pool_alloc_init(pool);
 }
@@ -223,8 +240,8 @@ int fc_thread_pool_run(FCThreadPool *pool, fc_thread_pool_callback func,
     }
 
     PTHREAD_MUTEX_LOCK(&thread->lock);
-    thread->func = func;
-    thread->arg = arg;
+    thread->callback.func = func;
+    thread->callback.arg = arg;
     if (!thread->inited) {
         result = fc_create_thread(&thread->tid, thread_entrance,
                 thread, pool->stack_size);
diff --git a/src/thread_pool.h b/src/thread_pool.h
index 9392cee..0ff0199 100644
--- a/src/thread_pool.h
+++ b/src/thread_pool.h
@@ -6,7 +6,15 @@
 #include "fast_mblock.h"
 #include "pthread_func.h"
 
-typedef void (*fc_thread_pool_callback)(void *arg);
+typedef void (*fc_thread_pool_callback)(void *arg, void *thread_data);
+typedef void* (*fc_alloc_thread_extra_data_callback)();
+typedef void  (*fc_free_thread_extra_data_callback)(void *ptr);
+
+typedef struct fc_thread_extra_data_callbacks
+{
+    fc_alloc_thread_extra_data_callback alloc;
+    fc_free_thread_extra_data_callback free;
+} FCThreadExtraDataCallbacks;
 
 struct fc_thread_pool;
 typedef struct fc_thread_info
@@ -16,14 +24,18 @@ typedef struct fc_thread_info
     pthread_t tid;
     pthread_mutex_t lock;
     pthread_cond_t cond;
-    fc_thread_pool_callback func;
-    void *arg;
+    void *tdata;  //thread data defined by the caller
+    struct {
+        fc_thread_pool_callback func;
+        void *arg;
+    } callback;
     struct fc_thread_pool *pool;
     struct fc_thread_info *next;
 } FCThreadInfo;
 
 typedef struct fc_thread_pool
 {
+    char name[64];
 	FCThreadInfo *threads;  //all thread info
 	FCThreadInfo *freelist;
 	pthread_mutex_t lock;
@@ -38,15 +50,22 @@ typedef struct fc_thread_pool
         volatile int dealing;  //dealing task thread count
     } thread_counts;
     bool * volatile pcontinue_flag;
+    FCThreadExtraDataCallbacks extra_data_callbacks;
 } FCThreadPool;
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-int fc_thread_pool_init(FCThreadPool *pool, const int limit,
-        const int stack_size, const int max_idle_time,
-        const int min_idle_count, bool * volatile pcontinue_flag);
+#define fc_thread_pool_init(pool, name, limit, stack_size, max_idle_time, \
+        min_idle_count, pcontinue_flag) \
+    fc_thread_pool_init_ex(pool, name, limit, stack_size, max_idle_time, \
+        min_idle_count, pcontinue_flag, NULL)
+
+int fc_thread_pool_init_ex(FCThreadPool *pool, const char *name,
+        const int limit, const int stack_size, const int max_idle_time,
+        const int min_idle_count, bool * volatile pcontinue_flag,
+        FCThreadExtraDataCallbacks *extra_data_callbacks);
 
 void fc_thread_pool_destroy(FCThreadPool *pool);