void PrintDriver(){
int i, code;
char *p;
msg_t msg;
msg.recipient = 2;
printing_semaphore = SemGet(0);
outportb(LPT1_BASE+LPT_CONTROL, PC_SLCTIN);
code = inportb(LPT1_BASE+LPT_STATUS);
for(i=0; i<50; i++)IO_DELAY();
outportb(LPT1_BASE+LPT_CONTROL, PC_INIT|PC_SLCTIN|PC_IRQEN);
Sleep(1);
for(;;){
MsgRcv(&msg);
cons_printf("PrintDriver (PID %d) now prints...\n",GetPid());
p = msg.data;
while(*p){
SemWait(printing_semaphore);
outportb(LPT1_BASE+LPT_DATA, *p);
code = inportb(LPT1_BASE+LPT_CONTROL);
outportb(LPT1_BASE+LPT_CONTROL, code|PC_STROBE);
for(i=0; i<50; i++)IO_DELAY();
outportb(LPT1_BASE+LPT_CONTROL, code);
p++;
}
}
}
void PrintDriver()
{
int i, code;
char *p;
msg_t temp_msg;
printing_semaphore = SemGet(0); //request semaphore printing_semaphore, limit 0.
// reset printer (check printer power, cable, and paper), it will jitter
outportb(LPT1_BASE+LPT_CONTROL, PC_SLCTIN); // CONTROL reg, SeLeCT INterrupt
code = inportb(LPT1_BASE+LPT_STATUS); // read STATUS
for(i = 0; i < 50; i++) //loop 50 times of IO_DELAY();
{
IO_DELAY();
}
outportb(LPT1_BASE+LPT_CONTROL, PC_INIT|PC_SLCTIN|PC_IRQEN); // IRQ ENable
Sleep(1); //Sleep for a second, needs time resetting
while(1)//forever loop:
{
temp_msg.recipient = running_pid;
MsgRcv(&temp_msg);//receive a message, get if msg to print *******
p = temp_msg.data;
cons_printf("PrintDriver (PID %d) now prints...\n", GetPid()); //a notification msg (match how demo runs)
//set p to point to start of character string in message
while (*p != '\0') //"what p points to" is not null/empty/(char)0,
{
outportb(LPT1_BASE+LPT_DATA, *p); // write char to DATA reg
code = inportb(LPT1_BASE+LPT_CONTROL); // read CONTROL reg
outportb(LPT1_BASE+LPT_CONTROL, code|PC_STROBE); // write CONTROL, STROBE added
for(i = 0; i < 50; i++) //do 50 times of IO_DELAY
{
IO_DELAY();
}
outportb(LPT1_BASE+LPT_CONTROL, code); // send back original CONTROL
SemWait(printing_semaphore);//semaphore-wait on the printing semaphore
p++; //move p to next character to print
}
}
}
int
main()
{
int *array = (int *)ShmAllocate(10*sizeof(int));
array[0]=1;
int x = Fork();
int id = SemGet(SEMKEY);
if(x == 0) {
SemOp(id, -1);
PrintChar('C');
array[0]=10;
SemOp(id, 1);
} else {
Join(x);
SemOp(id, -1);
PrintChar('P');
PrintInt(array[0]);
SemOp(id, 1);
}
}
int
main()
{
array = (int*)ShmAllocate(sizeof(int)*(SIZE+3)); // queue[SIZE], head, tail, count
int x, i, j, seminit = 1, y;
int pid[NUM_DEQUEUER+NUM_ENQUEUER];
for (i=0; i<SIZE; i++) array[i] = -1;
array[SIZE] = 0;
array[SIZE+1] = 0;
array[SIZE+2] = 0;
semid = SemGet(SEM_KEY1);
SemCtl(semid, SYNCH_SET, &seminit);
stdoutsemid = SemGet(SEM_KEY2);
SemCtl(stdoutsemid, SYNCH_SET, &seminit);
notFullid = CondGet(COND_KEY1);
notEmptyid = CondGet(COND_KEY2);
int temp;
temp = -11;
SemCtl(semid,SYNCH_GET,&temp);
PrintInt(temp);
for (i=0; i<NUM_DEQUEUER; i++) {
x = Fork();
if (x == 0) {
for (j=0; j<NUM_DEQUEUE_OP; j++) {
x = Dequeue (i, &y);
SemOp(stdoutsemid, -1);
PrintString("Dequeuer ");
PrintInt(i);
PrintString(": Got ");
PrintInt(x);
PrintString(" from slot ");
PrintInt(y);
PrintChar('\n');
SemOp(stdoutsemid, 1);
}
Exit(DEQUEUE_EXIT_CODE);
}
pid[i] = x;
}
for (i=0; i<NUM_ENQUEUER; i++) {
x = Fork();
if (x == 0) {
x = i*NUM_ENQUEUE_OP;
for (j=0; j<NUM_ENQUEUE_OP; j++) {
y = Enqueue (x+j, i);
SemOp(stdoutsemid, -1);
PrintString("Enqueuer ");
PrintInt(i);
PrintString(": Inserted ");
PrintInt(x+j);
PrintString(" in slot ");
PrintInt(y);
PrintChar('\n');
SemOp(stdoutsemid, 1);
}
Exit(ENQUEUE_EXIT_CODE);
}
pid[i+NUM_DEQUEUER] = x;
}
for (i=0; i<NUM_DEQUEUER+NUM_ENQUEUER; i++) {
x = Join(pid[i]);
SemOp(stdoutsemid, -1);
PrintString("Parent joined with ");
PrintInt(pid[i]);
PrintString(" having exit code ");
PrintInt(x);
PrintChar('\n');
SemOp(stdoutsemid, 1);
}
SemCtl(semid, SYNCH_REMOVE, 0);
SemCtl(stdoutsemid, SYNCH_REMOVE, 0);
CondRemove(notFullid);
CondRemove(notEmptyid);
return 0;
}
