diff --git a/HISTORY b/HISTORY
index 36d1750..c723a82 100644
--- a/HISTORY
+++ b/HISTORY
@@ -1,8 +1,9 @@
 
-Version 1.52  2021-06-02
+Version 1.52  2021-06-08
   * process_stop more gracefully (kill -9 on timeout)
   * add function fc_queue_pop_to_queue_ex
   * add function get_path_block_size and get_device_block_size
+  * add function fc_check_realloc_iovec_array
 
 Version 1.51  2021-05-27
   * fast_mblock.[hc]: support batch alloc and batch free
diff --git a/src/common_define.h b/src/common_define.h
index cdcb40d..31f6428 100644
--- a/src/common_define.h
+++ b/src/common_define.h
@@ -249,6 +249,13 @@ typedef struct
     pthread_cond_t cond;
 } pthread_lock_cond_pair_t;
 
+typedef struct
+{
+    int alloc;
+    int count;
+    struct iovec *iovs;
+} iovec_array_t;
+
 typedef struct
 {
     char buff[PATH_MAX];
@@ -293,6 +300,12 @@ typedef void* (*MallocFunc)(size_t size);
 //for printf format %.*s
 #define FC_PRINTF_STAR_STRING_PARAMS(s)  (s).len, (s).str
 
+#define FC_SET_IOVEC(iovec, buff, len) \
+    do {  \
+        (iovec).iov_base = buff; \
+        (iovec).iov_len = len;   \
+    } while (0)
+
 #define FC_SET_STRING(dest, src)  \
     do {  \
         (dest).str = src;         \
diff --git a/src/fast_task_queue.h b/src/fast_task_queue.h
index 0b44f8b..fd6bd19 100644
--- a/src/fast_task_queue.h
+++ b/src/fast_task_queue.h
@@ -84,7 +84,13 @@ struct fast_task_info
         char client_ip[IP_ADDRESS_SIZE];
     };
 	void *arg;  //extra argument pointer
-	char *data; //buffer for write or recv
+	char *data; //buffer for write or read
+
+    struct {
+        struct iovec *iovs;
+        int count;
+    } iovec_array; //for writev
+
 	int size;   //alloc size
 	int length; //data length
 	int offset; //current offset
diff --git a/src/shared_func.h b/src/shared_func.h
index 1468df5..99d05b3 100644
--- a/src/shared_func.h
+++ b/src/shared_func.h
@@ -24,6 +24,7 @@
 #include <sys/time.h>
 #include <sys/resource.h>
 #include "common_define.h"
+#include "fc_memory.h"
 #include "ini_file_reader.h"
 
 #define NORMALIZE_FLAGS_URL_ENABLED        1
@@ -1104,6 +1105,38 @@ int fc_check_filename(const string_t *filename, const char *caption);
  */
 bool is_digital_string(const char *str);
 
+static inline int fc_check_realloc_iovec_array(
+        iovec_array_t *array, const int target_size)
+{
+    int new_alloc;
+    struct iovec *new_iovs;
+
+    if (array->alloc >= target_size) {
+        return 0;
+    }
+
+    if (array->alloc == 0) {
+        new_alloc = 64;
+    } else {
+        new_alloc = array->alloc * 2;
+    }
+    while (new_alloc < target_size) {
+        new_alloc *= 2;
+    }
+
+    new_iovs = (struct iovec *)fc_malloc(
+            sizeof(struct iovec) * new_alloc);
+    if (new_iovs == NULL) {
+        return ENOMEM;
+    }
+
+    if (array->iovs != NULL) {
+        free(array->iovs);
+    }
+    array->iovs = new_iovs;
+    array->alloc = new_alloc;
+    return 0;
+}
 
 #ifdef __cplusplus
 }