tls_os_queue_send 和 tls_os_queue_receive 应怎么使用?

/***************************************************************************** 
* 
* File Name :  main. c
* 
* Description:  main 
* 
* Copyright  (c)  2014 Winner Micro Electronic Design Co. ,  Ltd.  
* All rights reserved.  
* 
* Author :  dave
* 
* Date :  2014-6-14
*****************************************************************************/ 
#include "wm_include. h"

#define USER_TASK_QUEUE_SIZE             1
#define USER_TASK_QUEUE_TEST             0x01
static tls_os_queue_t *user_task_queue = NULL; 

static OS_STK TaskStk1[512]; 
static OS_STK TaskStk2[512]; 



static void user_task1 (void) 
{

    while (1) 
    {
        printf ("---"  send msg\r\n") ; 
        // 发送队里消息
        tls_os_queue_send (user_task_queue,   (void *) USER_TASK_QUEUE_TEST,  0) ; 
        tls_os_time_delay (HZ) ; 
    }
}

static void user_task2 (void) 
{
    void *msg; 
    tls_os_status_t ret; 

    for  ( ;  ;  ) 
    {
        // 接收队里消息
        ret= tls_os_queue_receive (user_task_queue,   (void **) &msg,  0,  0) ; 
        if  (ret == TLS_OS_SUCCESS) 
        {
            switch ( (u32) msg) 
            {
            case USER_TASK_QUEUE_TEST:  // 收到指定的消息
                printf ("---"  received msg\r\n") ; 
                break; 

            default: 
                break; 
            }
        }
    }
}

void UserMain (void) 
{
    printf ("\n user task \n") ; 
    // 创建 task1 用于发送队列消息
    tls_os_task_create (NULL,  "task1", 
                         ( void  (*) ) user_task1, 
                        NULL, 
                         (void *) TaskStk1,           /* task's stack start address */
                        sizeof (TaskStk1) ,  /* task's stack size,  unit: byte */
                        31, 
                        0) ; 
    // 创建 task2 用于接收队里消息
    tls_os_task_create (NULL,  "task2", 
                         ( void  (*) ) user_task2, 
                        NULL, 
                         (void *) TaskStk2,           /* task's stack start address */
                        sizeof (TaskStk2) ,  /* task's stack size,  unit: byte */
                        32, 
                        0) ; 
    // 创建消息队列
    tls_os_queue_create (&user_task_queue,  USER_TASK_QUEUE_SIZE) ; 

#if DEMO_CONSOLE
    CreateDemoTask () ; 
#endif
//用户自己的 task
}