451 lines
11 KiB
C
451 lines
11 KiB
C
#include "scheduler.h"
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enum states {
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READY = 0, DEAD, BLOCKED, BBCHILDREN, WAITING, BLOCKEDIO
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};
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typedef struct processCDT {
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struct processCDT *next;
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char *name;
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int pid;
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int ppid;
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uint64_t rsp;
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uint64_t rbp;
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char priority;
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char executions;
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char foreground;
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enum states state;
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int *fd;
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int children;
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char backWait;
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} processCDT;
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typedef struct sleepCDT {
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int pid;
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long time;
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long secs;
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struct sleepCDT *next;
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} sleepCDT;
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processCDT *firstBlockedIteration = NULL;
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processCDT *firstProcess = NULL;
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processCDT *lastProcess = NULL;
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sleepCDT *firstSleep = NULL;
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static processCDT *currentProcess = NULL;
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static int pids = IDLE_PID;
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static char update = 1;
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static char idleFlag = 2;
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void removeProcess(processCDT *del, processCDT **first, processCDT **last) {
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processCDT *prev = NULL;
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del = searchProcess(&prev, del->pid, *first);
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if (prev == NULL) {
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*first = del->next;
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if (*last == del)
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*last = NULL;
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} else {
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prev->next = del->next;
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if (*last == del)
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*last = prev;
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}
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}
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uint64_t nextProcess(uint64_t currentRSP) {
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if (currentProcess != NULL)
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currentProcess->rsp = currentRSP;
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processCDT *prev = currentProcess;
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if (currentProcess != NULL && currentProcess->state == READY &&
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currentProcess->executions == MAX_PRIORITY - currentProcess->priority + 1) {
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currentProcess->executions = 0;
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currentProcess = currentProcess->next;
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}
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while (currentProcess == NULL || currentProcess->state == BLOCKED || currentProcess->state == DEAD ||
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currentProcess->state == WAITING || currentProcess->state == BLOCKEDIO) {
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if (currentProcess == NULL) {
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currentProcess = firstProcess;
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} else if (currentProcess == firstBlockedIteration) {
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idleFlag = 1;
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unblock(IDLE_PID);
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prev = currentProcess;
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currentProcess = currentProcess->next;
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} else if (currentProcess->state == DEAD) {
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processCDT *del = currentProcess;
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currentProcess = currentProcess->next;
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removeProcess(del, &firstProcess, &lastProcess);
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vPortFree((void *) del);
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} else if (currentProcess->state == BLOCKED || currentProcess->state == WAITING ||
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currentProcess->state == BLOCKEDIO) {
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if (firstBlockedIteration == NULL)
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firstBlockedIteration = currentProcess;
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prev = currentProcess;
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currentProcess = currentProcess->next;
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}
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}
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if (currentProcess->pid != IDLE_PID && idleFlag) {
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idleFlag = 0;
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block(IDLE_PID);
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}
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firstBlockedIteration = NULL;
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currentProcess->executions++;
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return currentProcess->rsp;
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}
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void idle() {
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while (1) {
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haltcpu();
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}
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}
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void initScheduler() {
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char *argv[] = {"idle"};
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nice(enqueueProcess(idle, 0, 1, argv, NULL), 19);
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}
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int enqueueProcess(void (*fn)(int, char **), char foreground, int argc, char *argv[], int *fd) {
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if (fd == NULL) {
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int *aux = pvPortMalloc(2 * sizeof(int));
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aux[0] = 0;
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aux[1] = 1;
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fd = aux;
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}
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if (!idleFlag)
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block(IDLE_PID);
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if (currentProcess != NULL) {
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if (foreground)
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currentProcess->children++;
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if (currentProcess->foreground && foreground) {
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currentProcess->foreground = 0;
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currentProcess->backWait = 1;
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}
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}
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processADT process = pvPortMalloc(sizeof(processCDT));
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uint64_t *auxi = pvPortMalloc(STACK_SIZE);
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uint64_t *rbp = STACK_SIZE + auxi;
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uint64_t *rsp = rbp - 20;
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char priority = (foreground == 1) ? DEF_PRIORITY : MAX_PRIORITY / 2;
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char *aux = pvPortMalloc(10);
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int j;
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for (j = 0; j < MAX_NAME_SIZE - 1 && argv[0][j] != 0; j++) {
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aux[j] = argv[0][j];
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}
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aux[j] = '\0';
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process->name = aux;
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process->pid = pids++;
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process->ppid = currentProcess->pid;
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process->priority = priority;
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process->rsp = (uint64_t) rsp;
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process->rbp = (uint64_t) rbp;
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process->executions = 0;
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process->foreground = foreground;
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process->state = READY;
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process->fd = fd;
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process->next = NULL;
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process->children = 0;
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process->backWait = 0;
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process->rsp = _initialize_stack_frame(fn, rbp, argc, argv);
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if (firstProcess == NULL)
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firstProcess = process;
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else
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lastProcess->next = process;
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lastProcess = process;
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return process->pid;
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}
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void sleep(int secs) {
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if (currentProcess == NULL)
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return;
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sleepCDT *proc = pvPortMalloc(sizeof(sleepCDT));
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proc->pid = currentProcess->pid;
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proc->secs = secs;
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proc->time = getTimeOfDay();
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proc->next = firstSleep;
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firstSleep = proc;
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block(currentProcess->pid);
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}
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void wakeUp(sleepCDT *wake, sleepCDT *prev) {
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if (wake == firstSleep)
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firstSleep = wake->next;
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else {
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prev->next = wake->next;
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}
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unblock(wake->pid);
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vPortFree(wake);
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}
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void checkSleeping() {
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sleepCDT *prev = NULL;
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sleepCDT *aux = firstSleep;
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while (aux != NULL) {
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if (getTimeOfDay() >= aux->time + aux->secs) {
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wakeUp(aux, prev);
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aux = prev->next;
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} else {
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prev = aux;
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aux = aux->next;
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}
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}
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}
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processADT searchProcess(processADT *previous, int pid, processADT first) {
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processADT curr = first;
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*previous = NULL;
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while (curr != NULL) {
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if (curr->pid == pid) {
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break;
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}
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*previous = curr;
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curr = curr->next;
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}
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if (curr == NULL) {
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*previous = NULL;
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return NULL;
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}
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return curr;
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}
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void unblockIO() {
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processCDT *aux = firstProcess;
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while (aux != NULL) {
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if (aux->state == BLOCKEDIO)
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aux->state = READY;
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aux = aux->next;
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}
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}
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char blockIO() {
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if (currentProcess == NULL || currentProcess->state == DEAD)
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return EXIT_FAILURE;
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else {
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currentProcess->state = BLOCKEDIO;
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}
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processCDT *prev = NULL;
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processADT parent = searchProcess(&prev, currentProcess->ppid, firstProcess);
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if (currentProcess->foreground) {
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if (parent->backWait) {
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parent->backWait = 0;
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parent->foreground = 1;
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}
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}
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forceTimer();
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return EXIT_SUCCESS;
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}
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char block(int pid) {
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processADT prev = NULL;
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processADT del = searchProcess(&prev, pid, firstProcess);
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if (del == NULL || del->state == DEAD)
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return EXIT_FAILURE;
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else {
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del->state = BLOCKED;
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}
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processADT parent = searchProcess(&prev, del->ppid, firstProcess);
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if (del->foreground) {
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if (parent->backWait) {
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parent->backWait = 0;
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parent->foreground = 1;
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}
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}
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if (pid == currentProcess->pid) {
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forceTimer();
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}
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return EXIT_SUCCESS;
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}
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char unblock(int pid) {
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processADT prev = NULL;
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processADT del = searchProcess(&prev, pid, firstProcess);
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if (del == NULL || del->state == DEAD) {
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return EXIT_FAILURE;
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} else {
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del->state = READY;
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}
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processADT parent = searchProcess(&prev, del->ppid, firstProcess);
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if (del->foreground) {
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if (parent->foreground) {
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parent->backWait = 1;
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parent->foreground = 0;
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}
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}
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return EXIT_SUCCESS;
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}
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char kill(int pid) {
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processADT prev = NULL;
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processADT del = searchProcess(&prev, pid, firstProcess);
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if (del == NULL) {
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return EXIT_FAILURE;
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}
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processADT parent = searchProcess(&prev, del->ppid, firstProcess);
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if (parent != NULL && del->foreground) {
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parent->children--;
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if (!parent->children && parent->state == WAITING) {
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parent->state = READY;
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}
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if (parent->backWait) {
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parent->backWait = 0;
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parent->foreground = 1;
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}
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}
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vPortFree(del->fd);
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vPortFree((void *) del->rbp - STACK_SIZE);
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del->state = DEAD;
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if (pid == currentProcess->pid) {
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forceTimer();
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}
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return EXIT_SUCCESS;
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}
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int getFdOut() {
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if (currentProcess == NULL)
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return EXIT_FAILURE;
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return currentProcess->fd[1];
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}
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int getFdIn() {
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if (currentProcess == NULL)
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return EXIT_FAILURE;
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return currentProcess->fd[0];
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}
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void exitProcess() {
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kill(currentProcess->pid);
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}
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char nice(int pid, char offset) {
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if (offset >= 20 || offset < -20)
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return EXIT_FAILURE;
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processADT prev = NULL;
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processADT del = searchProcess(&prev, pid, firstProcess);
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if (del == NULL) {
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return EXIT_FAILURE;
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} else {
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del->priority = offset + 20;
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}
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return EXIT_SUCCESS;
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}
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void wait() {
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if (currentProcess != NULL && currentProcess->children != 0) {
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currentProcess->state = WAITING;
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forceTimer();
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}
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}
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char updateRSP(uint64_t newRsp) {
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if (currentProcess == NULL) {
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return -1;
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}
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if (update)
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currentProcess->rsp = newRsp;
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return update;
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}
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int getPid() {
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if (currentProcess == NULL)
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return EXIT_FAILURE;
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return currentProcess->pid;
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}
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char quitCPU() {
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int pid = getPid();
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if (pid == EXIT_FAILURE)
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return EXIT_FAILURE;
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// return block(pid);
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forceTimer();
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return EXIT_SUCCESS;
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}
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char isForeground() {
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if (currentProcess == NULL)
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return -1;
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return currentProcess->foreground;
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}
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void getGenProcessData(char **out, char *written, char toAdd, char *in, char isLast) {
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char copied = strcpy(*out, in);
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*out += copied;
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*out += addSpaces(*out, toAdd - copied);
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*written += toAdd;
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if (!isLast) {
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*out += addSpaces(*out, 2);
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*written += 2;
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}
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}
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char getProcessData(char *out, processCDT *proc) {
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if (proc == NULL)
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return EXIT_FAILURE;
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char written = 0;
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char flag = 0;
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for (int j = 0; j < MAX_NAME_SIZE; j++) {
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if (!flag && proc->name[j] == 0)
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flag = 1;
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else if (flag)
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out += addSpaces(out, 1);
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else
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*out++ = proc->name[j];
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}
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written += MAX_NAME_SIZE;
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out += addSpaces(out, 2);
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written += 2;
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char buffer[10];
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getGenProcessData(&out, &written, MAX_ATTR_SIZE, itoa(proc->pid, buffer, 10, 10), 0);
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getGenProcessData(&out, &written, MAX_ATTR_SIZE, itoa(proc->priority, buffer, 10, 2), 0);
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getGenProcessData(&out, &written, MAX_NAME_SIZE, itoa(proc->rsp, buffer, 16, 10), 0);
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getGenProcessData(&out, &written, MAX_NAME_SIZE, itoa(proc->rbp, buffer, 16, 10), 0);
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getGenProcessData(&out, &written, MAX_ATTR_SIZE, (proc->foreground == 1) ? "F" : "B", 0);
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getGenProcessData(&out, &written, MAX_ATTR_SIZE,
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proc->state == BLOCKED ? "Block" : proc->state == DEAD ? "Killed" : "Ready", 1);
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return written;
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}
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char *processes() {
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char *ans = pvPortMalloc(pids * PROCESS_DATA_MAX_SIZE);
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char *ret = ans;
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char *info = "name pid prio rsp rbp fore state\n";
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ans += strcpy(ans, info);
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processCDT *aux = firstProcess;
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while (aux != NULL) {
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char writtenChars = getProcessData(ans, aux);
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if (writtenChars == EXIT_FAILURE)
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return NULL;
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ans += writtenChars - 1;
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*ans++ = '\n';
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aux = aux->next;
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}
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*--ans = 0;
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return ret;
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} |