MIT License,all the people can use it for free, and thanks for uC/OS.

cQueue is message queue, is written in ANSI C in order to support as many platforms and compilers as possible.

cQueue using the cQueue struct data type:

/*---------------The cQueue structure ------------------------------------------------------------*/typedef struct cQueue{              void            **QMemory;  /* pointer to message queue storage area                          */                                       void            **QStart;   /* pointer to start of queue data                                 */    void            **QEnd;     /* pointer to end   of queue data                                 */    void            **QIn;      /* pointer to where next message will be inserted in the queue    */    void            **QOut;     /* pointer to where next message will be extracted from the queue */    int             QSize;      /* size of queue -- max number of entries                         */    int             QEntries;   /* current number of entries in the queue                         */} cQueue_t;

/* * Description  :   create and init the queue. * * @para[in]    :   start   is a pointer to the base address of the message queue  *                          storage area,the stroage area MUST be declare as an array *                          of pointers to 'void' as follows *  *                          void *messageStroage[size] *                             * @para[in]    :   size    is the number of elements in the storage area *  * @return      :   the pointer to the new queue */cQueue_t *cQcreate(int size);/* * Description  :   delete the queue, and free the stroage area * * @para[in]    :   pq      is the pointer to the queue * * @return      :   NULL */void cQDelete(cQueue_t *pq);/* * Description  :   flush the queue, the queue is like the new create state * * @para[in]    :   pq      is the pointer to the queue * * @return      :   NULL */void cQFlush(cQueue_t *pq);/* * Description  :   receive msg from queue, if queue is empty,return NULL * * @para[in]    :   pq      is the pointer to the queue * * @para[out]   :   perr    is the pointer to error return *  * @return      : the pointer to the receive msg. */void *cQRcv(cQueue_t *pq, char *perr);/* * Description  :   send a message to the queue * * @para[in]    :   pq      is the pointer to the queue * * @para[in]    :   pmsg    is the pointer to new message to send *  * @return      :   ERR_Q_NONE      The call was successful and the message was sent *                  ERR_Q_FULL      If the queue cannot accept any more messages because it is full. */int cQPost(cQueue_t *pq, void *pmsg);/* * Description  :   send a message to the queue,the message is posted at the FRONT instead of *                  the end of the queue. Using cQPostFront() alllows you to send 'priority' *                  message. * * @para[in]    :   pq      is the pointer to the queue * * @para[in]    :   pmsg    is the pointer to new message to send *  * @return      :   ERR_Q_NONE      The call was successful and the message was sent *                  ERR_Q_FULL      If the queue cannot accept any more messages because it is full. */int cQPostFront(cQueue_t *pq, void *pmsg);

the example.c show the cQueue'function.

because the type of element in the cQueue struct is (void ), so the message's type can be custom by youself.