// *** SEND MESSAGE ***
int send_message(int dest_id, msg_env *e) {
// if the env is NULL
if (!e)
return 0;
// if the PCB ID is not valid
if (dest_id > (NUM_PROC - 1) ) {
//printf("Invalid 'Send To' ID, %i, ", dest_id);
return 0;
}
// if the PCD ID is valid
// set the target_id parameter of the env to dest_id
e->target_id = dest_id;
e->sender_id = curr_process->pid;
// create a pointer to the target PCB using the target_id
PCB *target = convert_PID(dest_id);
// if the PID converts correctly to a pointer
if (target){
/*unblock the target process if necessary*/
// if the target's receive message queue is empty or the target is not an i-process
/*if (target->receive_msg_Q->head == NULL || target->priority != -1) {
// enqueue the PCB of the process on the appropriate ready queue
PCB_ENQ(target, convert_priority(target->priority)); //*****not sure if need to put a '&' before convert_priority
// set the target state to 'ready'
strcpy(target->state, "READY"); //apparently strcpy is how you write into an array of chars
}*/
// enqueue the env on the target's receive queue
env_ENQ(e, target->receive_msg_Q);
return 1;
}
// if the PID doesn't convert successfully
else
return 0;
}
// *** PROCESS C *** PID 5
void ProcessC(){
// init the local queue
struct envQ* localQ = (struct envQ *) malloc (sizeof (struct envQ));
if (localQ==NULL)
{
printf("localQ in Proc C not created properly");
return;
} // can we use the queue on the proc pcb instead?
PCB* pC_pcb = convert_PID(5);
msg_env* envC = request_msg_env();
// infinite loop of normal activity
while (1)
{
printf("A\n");
int NUM =envC->msg_text[0];
// if theres nothing the localQ, receive a message and enqueue it
if (localQ->head == NULL)
{
envC = receive_message();
int H = env_ENQ(envC,localQ);
if (H ==0)
printf("Cannot enqueue on localQ");
}
// if there is something on the localQ, dequeue it
else {
envC = env_DEQ(localQ);
}
// if the message type is count report, and the value in msg_text is evenly divisible by 20, display "Process C"
if (envC->msg_type == 2 && NUM % 20 == 0){
// send the display message
strcpy(envC->msg_text, "Process C\n\0");
int W = send_console_chars(envC); // Returns confirmation of sending
if (W==1)
{
// if it is the ack message request a delay of 10s, with wakeup code "wakeup10"
int R = request_delay(10000, WAKEUP, envC); // request_delay returns an int
if (R==0)
printf("Error with request_delay");
// wait for wakeup message
envC = receive_message();
// if its not the wakeup message put it on the local Q
while (envC->msg_type != WAKEUP)
{
envC = receive_message();
int XX = env_ENQ(envC,localQ);
if (XX==0)
printf("Error with putting message on local Q in Proc C");
}
}
else
printf("Error sending 'Process C' to screen in Proc C");
}
// deallocate envelopes
int dun = release_msg_env(envC);
if (dun==0)
printf("ERROR IN DEALLOCATING ENVELOPE AT END OF Proc C");
// release processor
release_processor();
}// end of infinite loop
}
