how_to_do_variable_length_queue.c

在AVR单片机上使用的一款RTOS

/**
 * Good variant of net frame generation task because 
 * thereis no need to have big buffer if the speed of net is low 
 * it saves a lot of RAM
 * How implement this thing?
 */
#define some_time RATE_MS/NET_SPEED_CHARS_PER_SEC
void Frame_Generation_task ()
{
int bufer_size;
int char_to_transmit;
int crc;
	while (1 == 1) {
		bufer_size = xQueuRecive (Net_Queue,char_to_transmit,some_time);
		send_to_the_net_media (SOME_NETWORK_ADRESS_OF_SENDER);
		crc = SOME_NETWORK_ADRESS_OF_SENDER
		while ( (bufer_size != 0) 
		&& xQueuRecive (Net_Queue,char_to_transmit,some_time) ) {
		send_to_the_net_media (char_to_transmit);
		crc = crc + char_to_transmit;
		};
		send_to_the_net_media (crc);	
	}
}

/**
 * BUT THEREIS A PROBLEM if TWO TASK WANTS TO SEND SOME INFORMATION
 */ 
void task