// **********************************************************************
// **********************************************************************
// create task
int createTask(char* name, // task name
int (*task)(int, char**), // task address
int priority, // task priority
int argc, // task argument count
char* argv[]) // task argument pointers
{
int tid;
// find an open tcb entry slot
for (tid = 0; tid < MAX_TASKS; tid++)
{
if (tcb[tid].name == 0)
{
char buf[8];
// create task semaphore
if (taskSems[tid]) deleteSemaphore(&taskSems[tid]);
sprintf(buf, "task%d", tid);
taskSems[tid] = createSemaphore(buf, 0, 0);
taskSems[tid]->taskNum = 0; // assign to shell
// copy task name
tcb[tid].name = (char*)malloc(strlen(name)+1);
strcpy(tcb[tid].name, name);
// set task address and other parameters
tcb[tid].task = task; // task address
tcb[tid].state = S_NEW; // NEW task state
tcb[tid].priority = priority; // task priority
tcb[tid].parent = curTask; // parent
tcb[tid].argc = argc; // argument count
// ?? malloc new argv parameters
tcb[tid].argv = malloc(argc*sizeof(char *));
int i;
for (i = 0; i < argc; i++)
tcb[tid].argv[i] = argv[i]; // argument pointers
tcb[tid].event = 0; // suspend semaphore
tcb[tid].RPT = 0; // root page table (project 5)
tcb[tid].cdir = CDIR; // inherit parent cDir (project 6)
// define task signals
createTaskSigHandlers(tid);
// Each task must have its own stack and stack pointer.
tcb[tid].stack = malloc(STACK_SIZE * sizeof(int));
// ?? may require inserting task into "ready" queue
if (tid) swapTask(); // do context switch (if not cli)
return tid; // return tcb index (curTask)
}
}
// tcb full!
return -1;
} // end createTask
// **********************************************************************
// **********************************************************************
// create task
int createTask(char* name, // task name
int (*task)(int, char**), // task address
int priority, // task priority
int argc, // task argument count
char* argv[]) // task argument pointers
{
int tid;
// find an open tcb entry slot
for (tid = 0; tid < MAX_TASKS; tid++)
{
if (tcb[tid].name == 0)
{
char buf[8];
// create task semaphore
if (taskSems[tid]) deleteSemaphore(&taskSems[tid]);
sprintf(buf, "task%d", tid);
taskSems[tid] = createSemaphore(buf, 0, 0);
taskSems[tid]->taskNum = 0; // assign to shell
// copy task name
tcb[tid].name = (char*)malloc(strlen(name)+1);
strcpy(tcb[tid].name, name);
// set task address and other parameters
tcb[tid].taskTime = 0; // SCOTT - p5
tcb[tid].task = task; // task address
tcb[tid].state = S_NEW; // NEW task state
tcb[tid].priority = priority; // task priority
tcb[tid].parent = curTask; // parent
tcb[tid].argc = argc; // argument count
// SCOTT malloc new argv parameters
char** mallocdArgv = malloc(sizeof(char*) * MAX_ARGS);
int i;
for (i = 0; i < argc; i++) {
mallocdArgv[i] = malloc(sizeof(char) * MAX_ARG_LENGTH); // max arg length = 50
strcpy(mallocdArgv[i], argv[i]);
}
tcb[tid].argv = mallocdArgv; // argument pointers // change this line
// end malloc SCOTT
tcb[tid].event = 0; // suspend semaphore
// SCOTT - set RPT
//tcb[tid].RPT = 0; // root page table (project 5) 4??
tcb[tid].RPT = LC3_RPT + ((tid) ? ((tid - 1) << 6) : 0); // from slide 35
tcb[tid].cdir = CDIR; // inherit parent cDir (project 6)
// define task signals
createTaskSigHandlers(tid);
// Each task must have its own stack and stack pointer.
tcb[tid].stack = malloc(STACK_SIZE * sizeof(int));
// ?? may require inserting task into "ready" queue
enqueue(readyQueue, tid, tcb[tid].priority); // SCOTT
if (tid) swapTask(); // do context switch (if not cli)
return tid; // return tcb index (curTask)
}
}
// tcb full!
return -1;
} // end createTask
