wip: deuxieme solution
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a704d60ff9
commit
51d91042da
2 changed files with 106 additions and 16 deletions
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@ -1,13 +1,30 @@
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#pragma once
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#include <errno.h>
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#include <pthread.h>
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#include <unistd.h>
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#define MAX_TASKS 1024
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struct scheduler;
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typedef void (*taskfunc)(void *, struct scheduler *);
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static inline int sched_default_threads() {
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struct scheduler {
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/* Mutex qui protège la pile */
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pthread_mutex_t mutex;
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/* Indicateur de changement d'état de la pile */
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pthread_cond_t cond;
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/* Position actuelle dans la pile */
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int top;
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/* Tâches */
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taskfunc tasks[MAX_TASKS];
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void *closures[MAX_TASKS];
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};
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static inline int sched_default_threads(void) {
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return sysconf(_SC_NPROCESSORS_ONLN);
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}
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101
src/sched.c
101
src/sched.c
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@ -1,29 +1,102 @@
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#include "../includes/sched.h"
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#include <pthread.h>
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#include <errno.h>
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#include <stdio.h>
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static struct scheduler sched;
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/* Lance une tâche de la pile */
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void *worker_routine(void *arg) {
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struct scheduler *s = (struct scheduler *)arg;
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while (1) {
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// Attente d'un changement d'état
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pthread_cond_wait(&s->cond, &s->mutex);
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pthread_mutex_lock(&s->mutex);
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if (s->top == -1) {
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// Il n'y a plus de tâches à exécuter
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pthread_mutex_unlock(&s->mutex);
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break;
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}
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// Extrait la tâche de la pile
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taskfunc f = s->tasks[s->top];
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void *closure = s->closures[s->top];
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s->top--;
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pthread_mutex_unlock(&s->mutex);
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// Exécute la tâche
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f(closure, s);
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// Signale que la tâche est terminée
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pthread_cond_signal(&s->cond);
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}
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return NULL;
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}
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int sched_init(int nthreads, int qlen, taskfunc f, void *closure) {
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sched_spawn(f, closure, NULL);
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return 0;
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if (nthreads == 0) {
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nthreads = sched_default_threads();
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}
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// Actuellement on n'utilises pas qlen
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// => On utilise une pile de taille fixe
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(void)qlen;
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sched.top = -1;
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if (pthread_mutex_init(&sched.mutex, NULL) != 0) {
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fprintf(stderr, "Can't init mutex\n");
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return -1;
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}
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if (pthread_cond_init(&sched.cond, NULL) != 0) {
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fprintf(stderr, "Can't init condition variable\n");
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return -1;
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}
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pthread_t threads[nthreads];
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for (int i = 0; i < nthreads; ++i) {
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if (pthread_create(&threads[i], NULL, worker_routine, &sched) != 0) {
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fprintf(stderr, "Can't create threads\n");
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return -1;
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}
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}
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if (sched_spawn(f, closure, &sched) != 0) {
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fprintf(stderr, "Can't create a new task\n");
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return -1;
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}
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for (int i = 0; i < nthreads; ++i) {
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if ((pthread_join(threads[i], NULL) != 0)) {
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fprintf(stderr, "Can't wait the thread %d\n", i);
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return -1;
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}
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}
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return 1;
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}
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int sched_spawn(taskfunc f, void *closure, struct scheduler *s) {
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pthread_t thread;
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int err;
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pthread_mutex_lock(&s->mutex);
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// Création d'un thread pour la tâche
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if ((err = pthread_create(&thread, NULL, (void *(*)(void *))f, closure)) !=
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0) {
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fprintf(stderr, "pthread_create error %d\n", errno);
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if (s->top + 1 >= MAX_TASKS) {
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pthread_mutex_unlock(&s->mutex);
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errno = EAGAIN;
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fprintf(stderr, "Stack full\n");
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return -1;
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}
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// Attend la fin du thread
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if ((err = pthread_join(thread, NULL)) != 0) {
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fprintf(stderr, "pthread_join error %d\n", errno);
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return -1;
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}
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s->top++;
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s->tasks[s->top] = f;
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s->closures[s->top] = closure;
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pthread_mutex_unlock(&s->mutex);
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pthread_cond_signal(&s->cond);
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return 0;
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}
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