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Dynamically allocate a RTX mailbox

Anh Huy Nguyen

Hello,

I'm using the Realview RTX and facing an issue of how to dynamically allocate a mailbox.

What I'm trying to create a reentrant function, which is called by some RTX tasks, and uses a mailbox to communicate with another task. I search through the RL-ARM manual and forum but all the examples show that the mailbox is declared globally. If so, the function is not reentrant anymore.

I have ask the Keil support but haven't received any response for this issue yet. So I put it here in hope that anyone could have the solution.

Thanks in advance for your answer.

Huy

Parents
  • 0 in reply to Robert McNamara

    I have posted to this thread as i think its of the same vain!

    I have a multiple (4of)task application passing messages via mailbox's (2of). I have one mailbox and its associated tasks works fine, i have a second task the call to the mail box works fine, however refuses to call the function within the task. See code below

    this task works fine

void tcp_task (void) __task {

U8 *ptr_tcp_task_msg;

while (1) {

 if(os_mbx_wait(TCP_task_msg_box, (void**)&ptr_tcp_task_msg, 0x0000) == OS_R_OK ){
/* if we have received a message decided what action to take */
   switch(*ptr_tcp_task_msg){
       case TCPTASK_DNS_ROUTINE:
       start_DNS_resolve((dns_struct*)tcp_task_msg);
       break;

    default:
       start_DNS_resolve((dns_struct*)tcp_task_msg);
       break;
    }
}

                        /* DNS routine */
 if ( dns_resolve.DNS_active == __TRUE){
  get_host_by_name((U8*)dns_resolve.ptr_dns_task_data->name, dns_cbfunc);
  }

  main_TcpNet();
  os_tsk_pass();
  }
}

    This mailbox functions fine however,

    The one below fails the message arrives will break on UARTSend function can see data in via message pointer but, fails to call function moves to os_tsk_pass.

    void communication_task (void) __task{

global_msg_struct *ptr_global_msg;

   while (1) {

    if(os_mbx_wait(communication_task_msg_box,void**&ptr_global_msg, 0xFFFF) == OS_R_OK ){
/* if we have received a message decided what action to take */
    //init_serial_port0();
    UARTSend((U8*) ptr_global_msg->tx_data );

    }
  os_tsk_pass();
  }
}

    Any comments welcome on the topic, tried calling a simpler function init_serial_port() this fails in same way. Though when called from init_task at start functioned ok.

    The mailbox in the second case is external linked using OS_MBX as its in included file, but the mail box itself seems to work fine.

    Obviously issue with the boxes i guess any pointers? excuse the pun, or similar issues in the past.

    regards
    Darren

Reply
  • 0 in reply to Robert McNamara

    I have posted to this thread as i think its of the same vain!

    I have a multiple (4of)task application passing messages via mailbox's (2of). I have one mailbox and its associated tasks works fine, i have a second task the call to the mail box works fine, however refuses to call the function within the task. See code below

    this task works fine

void tcp_task (void) __task {

U8 *ptr_tcp_task_msg;

while (1) {

 if(os_mbx_wait(TCP_task_msg_box, (void**)&ptr_tcp_task_msg, 0x0000) == OS_R_OK ){
/* if we have received a message decided what action to take */
   switch(*ptr_tcp_task_msg){
       case TCPTASK_DNS_ROUTINE:
       start_DNS_resolve((dns_struct*)tcp_task_msg);
       break;

    default:
       start_DNS_resolve((dns_struct*)tcp_task_msg);
       break;
    }
}

                        /* DNS routine */
 if ( dns_resolve.DNS_active == __TRUE){
  get_host_by_name((U8*)dns_resolve.ptr_dns_task_data->name, dns_cbfunc);
  }

  main_TcpNet();
  os_tsk_pass();
  }
}

    This mailbox functions fine however,

    The one below fails the message arrives will break on UARTSend function can see data in via message pointer but, fails to call function moves to os_tsk_pass.

    void communication_task (void) __task{

global_msg_struct *ptr_global_msg;

   while (1) {

    if(os_mbx_wait(communication_task_msg_box,void**&ptr_global_msg, 0xFFFF) == OS_R_OK ){
/* if we have received a message decided what action to take */
    //init_serial_port0();
    UARTSend((U8*) ptr_global_msg->tx_data );

    }
  os_tsk_pass();
  }
}

    Any comments welcome on the topic, tried calling a simpler function init_serial_port() this fails in same way. Though when called from init_task at start functioned ok.

    The mailbox in the second case is external linked using OS_MBX as its in included file, but the mail box itself seems to work fine.

    Obviously issue with the boxes i guess any pointers? excuse the pun, or similar issues in the past.

    regards
    Darren

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