int Child(void *arg) {
printf("In child\n");
USLOSS_WaitInt();
USLOSS_WaitInt();
USLOSS_WaitInt();
USLOSS_WaitInt();
USLOSS_WaitInt();
USLOSS_WaitInt();
USLOSS_WaitInt();
USLOSS_WaitInt();
printf("After wait\n");
return 0;
}
int P1_WaitDevice(int type, int unit, int *status){
if(procTable[currPid].state==2){//Checks if killed
return -3;
}
/*TO DO: Check If valid Unit*/
if(unit<0||unit>3){
return -1;
}
Semaphore* sema;
switch(type){
case USLOSS_CLOCK_INT:
if(unit!=1){
return -1;
}
USLOSS_WaitInt();
*status=-1;
break;
case USLOSS_ALARM_INT:
if(unit!=1){
return -1;
}
sema=&semTable[Alarm_Sema];
P1_P(sema);
*status=-1;
break;
case USLOSS_DISK_INT:
if(unit<1||unit>2){
return -1;
}
sema=&semTable[Disk_Sema];
P1_P(sema);
*status=-1;
break;
case USLOSS_TERM_INT:
if(unit<1||unit>4){
return -1;
}
sema=&semTable[Term_Sema];
P1_P(sema);
*status=-1;
break;
default:
return -2;//Invalid Type
}
return 0;
}
void
startup()
{
int status;
int i, j, k;
FILE *f;
char name[50];
int n;
// Compute the inputs and write them to the term*.in file. Each terminal reads unique content.
k = 0;
for(i = 0; i < USLOSS_TERM_UNITS; i++) {
memset(buffers[i], '\0', NUMCHARS);
counts[i] = 0;
snprintf(name, sizeof(name), "term%d.in", i);
f = fopen(name, "w");
assert(f != NULL);
for (j = 0; j < NUMCHARS; j++) {
inputs[i][j] = 'a' + k++;
}
n = fwrite(inputs[i], 1, NUMCHARS, f);
assert(n == NUMCHARS);
fclose(f);
}
for (i = 0; i < USLOSS_NUM_INTS; i++) {
USLOSS_IntVec[i] = dummy_handler;
}
// Turn on receive interrupts.
for(i = 0; i < USLOSS_TERM_UNITS; i++) {
status = USLOSS_DeviceOutput(USLOSS_TERM_DEV, i, (void *) USLOSS_TERM_CTRL_RECV_INT(0));
}
USLOSS_IntVec[USLOSS_TERM_INT] = term_handler;
// Turn on interrupts.
USLOSS_PsrSet(USLOSS_PsrGet() | USLOSS_PSR_CURRENT_INT);
// Read from the terminals.
while(done < USLOSS_TERM_UNITS ) {
USLOSS_WaitInt();
}
USLOSS_Halt(0);
}
void
startup()
{
int status;
int i;
for (i = 0; i < USLOSS_NUM_INTS; i++) {
USLOSS_IntVec[i] = dummy_handler;
}
// Turn on receive interrupts for terminal 0.
status = USLOSS_DeviceOutput(USLOSS_TERM_DEV, 0, (void *) USLOSS_TERM_CTRL_RECV_INT(0));
USLOSS_IntVec[USLOSS_TERM_INT] = term_handler;
// Turn on interrupts.
USLOSS_PsrSet(USLOSS_PsrGet() | USLOSS_PSR_CURRENT_INT);
// Wait in an infinite loops for interrupts.
while(1) {
USLOSS_WaitInt();
}
}
/* ------------------------------------------------------------------------
Name - sentinel
Purpose - The purpose of the sentinel routine is two-fold. One
responsibility is to keep the system going when all other
processes are blocked. The other is to detect and report
simple deadlock states.
Parameters - none
Returns - nothing
Side Effects - if system is in deadlock, print appropriate error
and halt.
----------------------------------------------------------------------- */
int sentinel (void *notused)
{
/*No Interupts within Part 1 so commented out*/
// int deadlock=1;
int i;
// printList(&readyHead);
while (numProcs > 1){
USLOSS_Console("in sentinel\n");
//Check for deadlock here
for(i=1;i<P1_MAXPROC;i++){
if(procTable[i].state == 4&&procTable[i].waitingOnDevice==0){
USLOSS_Console("Error: Deadlock\n");
USLOSS_Halt(1);
}
}
USLOSS_WaitInt();
}
USLOSS_Halt(0);
/* Never gets here. */
return 0;
} /* End of sentinel */
