我想用TencentOS tiny操作系统实现各个任务之间的通信，需要使用到消息队列，但是我发发现tos_message_queue.c文件中只有消息队列创建以及发布函数，没有消息队列的内容读取和订阅函数。苦苦找不到解决方案，故来此提问。
下面是tos_message_queue.h头文件，求大神指导我调用哪个函数可以实现读取消息队列里面的内容。
/*----------------------------------------------------------------------------
* Tencent is pleased to support the open source community by making TencentOS
* available.
*
* Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
* If you have downloaded a copy of the TencentOS binary from Tencent, please
* note that the TencentOS binary is licensed under the BSD 3-Clause License.
*
* If you have downloaded a copy of the TencentOS source code from Tencent,
* please note that TencentOS source code is licensed under the BSD 3-Clause
* License, except for the third-party components listed below which are
* subject to different license terms. Your integration of TencentOS into you
* own projects may require compliance with the BSD 3-Clause License, as well
* as the other licenses applicable to the third-party components included
* within TencentOS.
*---------------------------------------------------------------------------*/
#ifndef _TOS_MESSAGE_QUEUE_H_
#define _TOS_MESSAGE_QUEUE_H_
__CDECLS_BEGIN
#if TOS_CFG_MESSAGE_QUEUE_EN > 0u
typedef struct k_message_queue_st {
knl_obj_t knl_obj;
pend_obj_t pend_obj;
k_ring_q_t ring_q;
} k_msg_q_t;
/**
* @brief Create a message queue.
* create a message queue.
*
* @attention a MESSAGE is a "void *" pointer.
*
* @param[in] msg_q pointer to the handler of the message queue.
* @param[in] pool pool buffer of the message queue.
* @param[in] msg_cnt message count of the message queue.
*
* @return errcode
* @retval #K_ERR_NONE return successfully.
*/
__API__ k_err_t tos_msg_q_create(k_msg_q_t *msg_q, void *pool, size_t msg_cnt);
/**
* @brief Destroy a message queue.
* destroy a message queue.
*
* @attention None
*
* @param[in] msg_q pointer to the handler of the message queue.
*
* @return errcode
* @retval #K_ERR_NONE return successfully.
*/
__API__ k_err_t tos_msg_q_destroy(k_msg_q_t *msg_q);
#if TOS_CFG_MMHEAP_EN > 0u
/**
* @brief Create a message queue with dynamic allocated pool.
* create a message queue with dynamic allocated pool.
*
* @attention a MESSAGE is a "void *" pointer.
*
* @param[in] msg_q pointer to the handler of the message queue.
* @param[in] msg_cnt message count of the message queue.
*
* @return errcode
* @retval #K_ERR_NONE return successfully.
*/
__API__ k_err_t tos_msg_q_create_dyn(k_msg_q_t *msg_q, size_t msg_cnt);
/**
* @brief Destroy a message queue with dynamic allocated pool.
* destroy a message queue with dynamic allocated pool.
*
* @attention None
*
* @param[in] msg_q pointer to the handler of the message queue.
*
* @return errcode
* @retval #K_ERR_NONE return successfully.
*/
__API__ k_err_t tos_msg_q_destroy_dyn(k_msg_q_t *msg_q);
#endif
/**
* @brief Flush the message queue.
* flush the message queue.
*
* @attention None
*
* @param[in] msg_q pointer to the handler of the message queue.
*
* @return errcode
* @retval #K_ERR_NONE return successfully.
*/
__API__ k_err_t tos_msg_q_flush(k_msg_q_t *msg_q);
/**
* @brief Pend a message queue.
* pend a message queue.
*
* @attention we DONNOT perform a memcpy when msg_ptr is received(a MESSAGE is just a pointer).
*
* @param[in] msg_q pointer to the handler of the message queue.
* @param[OUT] msg_ptr a pointer to the message we wanna receive.
* @param[in] timeout how much time(in k_tick_t) we would like to wait.
*
* @return errcode
* @retval #K_ERR_PEND_NOWAIT we get nothing, and we don't wanna wait.
* @retval #K_ERR_PEND_SCHED_LOCKED we can wait, but scheduler is locked.
* @retval #K_ERR_PEND_TIMEOUT the time we wait is up, we get nothing.
* @retval #K_ERR_PEND_DESTROY the queue we are pending is destroyed.
* @retval #K_ERR_NONE return successfully.
*/
__API__ k_err_t tos_msg_q_pend(k_msg_q_t *msg_q, void **msg_ptr, k_tick_t timeout);
/**
* @brief Post a message queue.
* post a message queue and wakeup one pending task.
*
* @attention when tos_msg_q_post return successfully, only one task who are waitting for the message queue will be woken up.
*
* @param[in] msg_q pointer to the handler of the message queue.
* @param[in] msg_ptr the message to post(a MESSAGE is just a pointer).
*
* @return errcode
* @retval #K_ERR_RING_Q_FULL the message queue is full.
* @retval #K_ERR_NONE return successfully.
*/
__API__ k_err_t tos_msg_q_post(k_msg_q_t *msg_q, void *msg_ptr);
/**
* @brief Post a message queue.
* post a message queue and wakeup all the pending task.
*
* @attention when tos_msg_q_post_all return successfully, all of the tasks who are waitting for the message queue will be woken up.
*
* @param[in] msg_q pointer to the handler of the message queue.
* @param[in] msg_ptr the message to post(a MESSAGE is just a pointer).
*
* @return errcode
* @retval #K_ERR_RING_Q_FULL the message queue is full.
* @retval #K_ERR_NONE return successfully.
*/
__API__ k_err_t tos_msg_q_post_all(k_msg_q_t *msg_q, void *msg_ptr);
#endif
__CDECLS_END
#endif /* _TOS_MESSAGE_QUEUE_H_ */
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