[ECOS] cyg_thread_delay vs cyg_flag_wait behavior

["Leschke Serafin (lesc)" <lesc@zhaw.ch>]

hi and sorry to awake this zombie but I could not find anything other
then this old thread relating to my problem:


I have a programm (part of a driver ethernet driver) wich is needed to
do some perodic duties (sending special packets) and waiting for events
(handling special packets wich are not to be deleviered to the OS).
Waiting for this events is realised via flags because I get only one
interrupt for all packet and events ariving.

My Code loocks something like this:

initalize_threads(){
    /*init timer thread this is only used to create the timer so it can
has a custom priority*/
    cyg_thread_create(TIMER_PRIOROTY,
                      initialize_timer,
                      0,
                      "timer thread",
                      timer_stack,
                      TIMER_STACK_SIZE,
                      &timer_thread_hdl,
                      &timer_thread_obj);
    cyg_thread_resume(timer_thread_hdl);

    /*init irq dispatcher thread*/
    cyg_thread_create(DISPATCHER_PRIOROTY,
                      irq_dispatcher,
                      0,
                      "dispatcher thread",
                      dispatcher_stack,
                      DISPATCHER_STACK_SIZE,
                      &dispatcher_hdl,
                      &dispatcher_obj);
    cyg_thread_resume(dispatcher_hdl);
}

initialize_timer(cyg_addrword_t data){
     sys_clk= cyg_real_time_clock();
    cyg_clock_to_counter(sys_clk, &counter_hld);
    cyg_alarm_create(delay_req_counter_hld,
                    timer_handler,
                    (cyg_addrword_t)&_index,
                    &alarm_hld,
                    &alarm);
    cyg_alarm_initialize(alarm_hld,
                         START_DELAY,
                         TIMER_INTERVAL);
}

timer_handler(cyg_handle_t delay_req_alarm_hld,
                             cyg_addrword_t data){
        printf("WORKS!");
}

irq_dispatcher(cyg_addrword_t data){
    cyg_uint32 flags = 0;
    while (1){
        /*This do-while is not really imperative, it's just for the case
that the thread is woken up force-fully, which is probably never*/
        do{
            /* if I put a cyg_thread_delay() here everything works */
            flags = cyg_flag_wait(&isr_flags,PTCP_IRQ_FLAGS,
CYG_FLAG_WAITMODE_OR);
        }while(! flags);
        {
            /*Handling the events*/
          }
}

The Problem now is this only works if TIMER_PRIOROTY <
DISPATCHER_PRIOROTY otherwise the timer_handler is never called. On the
other hand it works if i put a cyg_thread_delay before my wait.

I hope I stated my problem clear, this is my first ecos project and I
still have quite a lot of trouble with it.

best regards Serafin

-- 
Serafin Leschke, BSc in Computer Sience UAS Zurich
Research Assistant

ZHAW, Zurich University of Applied Sciences
InES, Institute of Embedded Systems
Postfach
Technikumstr. 22
CH-8401 Winterthur
--
Tel: +41 58 934 69 79
Fax: +41 58 935 76 87
E-Mail: serafin.lescke@zhaw.ch
Web: http://ines.zhaw.ch
--


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