# 编程实例
#### 实例描述
创建一个队列，两个任务。任务1调用写队列接口发送消息，任务2通过读队列接口接收消息。
1. 通过LOS_TaskCreate创建任务1和任务2。
2. 通过LOS_QueueCreate创建一个消息队列。
3. 在任务1 send_Entry中发送消息。
4. 在任务2 recv_Entry中接收消息。
5. 通过LOS_QueueDelete删除队列。
#### 编程示例
前提条件：在menuconfig菜单中完成队列模块的配置。
```
#include "los_task.h"
#include "los_queue.h"
static UINT32 g_queue;
#define BUFFER_LEN 50
VOID send_Entry(VOID)
{
    UINT32 i = 0;
    UINT32 ret = 0;
    CHAR abuf[] = "test is message x";
    UINT32 len = sizeof(abuf);
    while (i < 5) {
        abuf[len -2] = '0' + i;
        i++;
        ret = LOS_QueueWriteCopy(g_queue, abuf, len, 0);
        if(ret != LOS_OK) {
            dprintf("send message failure, error: %x\n", ret);
        }
        LOS_TaskDelay(5);
    }
}
VOID recv_Entry(VOID)
{
    UINT32 ret = 0;
    CHAR readBuf[BUFFER_LEN] = {0};
    UINT32 readLen = BUFFER_LEN;
    while (1) {
        ret = LOS_QueueReadCopy(g_queue, readBuf, &readLen, 0);
        if(ret != LOS_OK) {
            dprintf("recv message failure, error: %x\n", ret);
            break;
        }
        dprintf("recv message: %s\n", readBuf);
        LOS_TaskDelay(5);
    }
    while (LOS_OK != LOS_QueueDelete(g_queue)) {
        LOS_TaskDelay(1);
    }
    dprintf("delete the queue success!\n");
}
UINT32 Example_CreateTask(VOID)
{
    UINT32 ret = 0; 
    UINT32 task1, task2;
    TSK_INIT_PARAM_S initParam;
    initParam.pfnTaskEntry = (TSK_ENTRY_FUNC)send_Entry;
    initParam.usTaskPrio = 9;
    initParam.uwStackSize = LOS_TASK_MIN_STACK_SIZE;
    initParam.pcName = "sendQueue";
#ifdef LOSCFG_KERNEL_SMP
    initParam.usCpuAffiMask = CPUID_TO_AFFI_MASK(ArchCurrCpuid());
#endif
    initParam.uwResved = LOS_TASK_STATUS_DETACHED;
    LOS_TaskLock();
    ret = LOS_TaskCreate(&task1, &initParam);
    if(ret != LOS_OK) {
        dprintf("create task1 failed, error: %x\n", ret);
        return ret;
    }
    initParam.pcName = "recvQueue";
    initParam.pfnTaskEntry = (TSK_ENTRY_FUNC)recv_Entry;
    ret = LOS_TaskCreate(&task2, &initParam);
    if(ret != LOS_OK) {
        dprintf("create task2 failed, error: %x\n", ret);
        return ret;
    }
    ret = LOS_QueueCreate("queue", 5, &g_queue, 0, BUFFER_LEN);
    if(ret != LOS_OK) {
        dprintf("create queue failure, error: %x\n", ret);
    }
    dprintf("create the queue success!\n");
    LOS_TaskUnlock();
    return ret;
}
```
#### 结果验证
```
create the queue success!
recv message: test is message 0
recv message: test is message 1
recv message: test is message 2
recv message: test is message 3
recv message: test is message 4
recv message failure, error: 200061d
delete the queue success!
```
#### 完整实例代码
[sample_queue.c](https://support.huaweicloud.com/kernelmanual-LiteOS/resource/sample_queue.c)