Paris7/work-stealing-scheduler
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This commit is contained in:
Mylloon 2024-04-24 17:21:38 +02:00
parent 3bf142d72d
commit 019edca380
Signed by: Anri
GPG key ID: A82D63DFF8D1317F
1 changed files with 24 additions and 23 deletions
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47
src/sched-ws.c
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@ -12,7 +12,7 @@ struct task_info {
};
struct scheduler {
/* Dernier élément du deque (premier ajouter) */
/* Premier élément du deque (dernier ajouter) */
int *bottom;
/* Variable de conditions pour reveillé les threads au besoin */
@ -36,7 +36,7 @@ struct scheduler {
/* Liste des threads */
pthread_t *threads;
/* Premier élément du deque (dernier ajouter) */
/* Dernier élément du deque (premier ajouter) */
int *top;
};
@ -54,10 +54,10 @@ sched_init(int nthreads, int qlen, taskfunc f, void *closure)
{
static struct scheduler sched;
sched.bottom = NULL;
sched.tasks = NULL;
sched.threads = NULL;
sched.top = NULL;
sched.bottom = NULL;
if(qlen <= 0) {
fprintf(stderr, "qlen must be greater than 0\n");
@ -88,17 +88,17 @@ sched_init(int nthreads, int qlen, taskfunc f, void *closure)
}
// Initialisation du curseur suivant l'état de la pile de chaque processus
if(!(sched.top = malloc(nthreads * sizeof(int)))) {
perror("Cursor top stack");
return sched_init_cleanup(sched, -1);
}
if(!(sched.bottom = malloc(nthreads * sizeof(int)))) {
perror("Cursor bottom stack");
return sched_init_cleanup(sched, -1);
}
if(!(sched.top = malloc(nthreads * sizeof(int)))) {
perror("Cursor top stack");
return sched_init_cleanup(sched, -1);
}
for(int i = 0; i < nthreads; ++i) {
sched.top[i] = 0;
sched.bottom[i] = 0;
sched.top[i] = 0;
}
// Allocation mémoire pour la pile de chaque processus
@ -186,16 +186,16 @@ sched_init_cleanup(struct scheduler s, int ret_code)
s.threads = NULL;
}
if(s.top) {
free(s.top);
s.top = NULL;
}
if(s.bottom) {
free(s.bottom);
s.bottom = NULL;
}
if(s.top) {
free(s.top);
s.top = NULL;
}
return ret_code;
}
@ -226,16 +226,16 @@ sched_spawn(taskfunc f, void *closure, struct scheduler *s)
pthread_mutex_lock(&s->mutex);
int next = (s->top[th] + 1) % s->qlen;
if(next == s->bottom[th]) {
int next = (s->bottom[th] + 1) % s->qlen;
if(next == s->top[th]) {
pthread_mutex_unlock(&s->mutex);
fprintf(stderr, "Stack is full\n");
errno = EAGAIN;
return -1;
}
s->tasks[th][s->top[th]] = (struct task_info){closure, f};
s->top[th] = next;
s->tasks[th][s->bottom[th]] = (struct task_info){closure, f};
s->bottom[th] = next;
pthread_mutex_unlock(&s->mutex);
@ -257,10 +257,10 @@ sched_worker(void *arg)
found = 0;
pthread_mutex_lock(&s->mutex);
if(s->bottom[curr_th] != s->top[curr_th]) {
if(s->top[curr_th] != s->bottom[curr_th]) {
found = 1;
s->top[curr_th] = (s->top[curr_th] - 1 + s->qlen) % s->qlen;
task = s->tasks[curr_th][s->top[curr_th]];
s->bottom[curr_th] = (s->bottom[curr_th] - 1 + s->qlen) % s->qlen;
task = s->tasks[curr_th][s->bottom[curr_th]];
}
if(!found) {
@ -269,11 +269,12 @@ sched_worker(void *arg)
i < s->nthreads; ++i) {
target = (i + k) % s->nthreads;
if(s->bottom[target] != s->top[target]) {
if(s->top[target] != s->bottom[target]) {
// Tâche trouvée
found = 1;
s->top[target] = (s->top[target] - 1 + s->qlen) % s->qlen;
task = s->tasks[target][s->top[target]];
s->bottom[target] =
(s->bottom[target] - 1 + s->qlen) % s->qlen;
task = s->tasks[target][s->bottom[target]];
break;
}
}