//******** OS_AddThread ***************
// add three foregound threads to the scheduler
// Inputs: three pointers to a void/void foreground tasks
// Outputs: 1 if successful, 0 if this thread can not be added
int OS_AddThreads(void(*task0)(void),
void(*task1)(void),
void(*task2)(void)){ int32_t status;
status = StartCritical();
tcbs[0].next = &tcbs[1]; // 0 points to 1
tcbs[1].next = &tcbs[2]; // 1 points to 2
tcbs[2].next = &tcbs[0]; // 2 points to 0
SetInitialStack(0); Stacks[0][STACKSIZE-2] = (int32_t)(task0); // PC
SetInitialStack(1); Stacks[1][STACKSIZE-2] = (int32_t)(task1); // PC
SetInitialStack(2); Stacks[2][STACKSIZE-2] = (int32_t)(task2); // PC
RunPt = &tcbs[0]; // thread 0 will run first
EndCritical(status);
return 1; // successful
}
int OS_AddThread(void(*task)(void), unsigned long stackSize, unsigned long priority)
{
uint32_t status;
status = OS_StartCritical();
//we will take the first thread from the dead pool
if(DeadPt == '\0')
{
OS_DisableInterrupts();
while(1){}
}
(DeadPt)->id = uniqueId; //unique id
(DeadPt)->active = 1;
(DeadPt)->sleepState = 0; //flag
(DeadPt)->priority = priority;
(DeadPt)->blockedState = 0; //flag
(DeadPt)->needToWakeUp = 0; //flag
SetInitialStack(DeadPt, stackSize);
(DeadPt)->stack[stackSize - 2] = (uint32_t)task; //push PC
uniqueId++;
addDeadToScheduler(&DeadPt);
if(higherPriorityAdded == 1)
{
OS_Suspend();
}
OS_EndCritical(status);
return 1;
}
// -------------------------- OS_AddThread ---------------------------
int OS_AddThread(void(*task)(void), unsigned long stackSize, unsigned long priority){
long status;
int i = 0;
status = StartCritical();
while((thread[i].id != 0) && (i < NUMTHREADS)){
i++;
};
if (thread[i].id != 0){
EndCritical(status);
return 0;
}
SetInitialStack(i, task);
thread[i].id = i + 1;
thread[i].priority = priority;
thread[i].blockSt = 0;
thread[i].sleepSt = 0;
linkTCB(&Actives, &thread[i]);
EndCritical(status);
return 1; //successfully added thread
}
int task_create(void *setup_ptr) {
int32_t i = 0, n = 0;
int32_t *ptr = (int32_t *)setup_ptr;
TASK_STRUCT *task = (TASK_STRUCT *)(*ptr); // register r0
int32_t numOftask = *((int32_t *)setup_ptr + 1); // register r1
// TASK_STRUCT task;
TCB *TCBList = &OS_TCB[0];
for (i = 0; i < numOftask; i++) {
SetInitialStack(i);
// save func value in both PC and LR Registers Initially
STACK[i][STACK_SIZE - 2] = (int32_t)((task[i].func));
STACK[i][STACK_SIZE - 3] = (int32_t)((task[i].func));
TCBList[i].priority = task[i].priority;
TCBList[i].C = task[i].C;
TCBList[i].T = task[i].T;
TCBList[i].next = &TCBList[i + 1];
}
RUNQ = &TCBList[0];
// make run queue circular by going to last
// valid task block and setting next to RUNQ
TCBList[i - 1].next = RUNQ;
return 0;
}
