int in_main() {
if ((!in_low_int()) && (!in_high_int())) {
return (1);
} else {
return (0);
}
}
void SleepIfOkay() {
// we won't sleep if the main isn't willing to block
if (MQ_Main_Willing_to_block == 0) {
return;
}
// check to see if we are handling a low priority interrupt
// if so, we are not going to sleep
if (in_low_int()) {
return;
}
// we know that we are in a high priority interrupt handler
// but we'll check to make sure and return if we are not
if (!in_high_int()) {
return;
}
// since we are the only thing executing that could be
// putting something into a message queue destined for main()
// we can safely check the message queues now
// if they are empty, we'll go to sleep
if (check_msg(&ToMainHigh_MQ)) {
return;
}
if (check_msg(&ToMainLow_MQ)) {
return;
}
enter_sleep_mode();
}
signed char FromMainLow_recvmsg(unsigned char maxlength, unsigned char *msgtype, void *data) {
#ifdef DEBUG
if (!in_low_int()) {
return (MSG_NOT_IN_LOW);
}
#endif
return (recv_msg(&FromMainLow_MQ, maxlength, msgtype, data));
}
signed char ToMainLow_sendmsg(unsigned char length, unsigned char msgtype, void *data) {
#ifdef DEBUG
if (!in_low_int()) {
return (MSG_NOT_IN_LOW);
}
#endif
return (send_msg(&ToMainLow_MQ, length, msgtype, data));
}
