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error: dereferencing pointer to incomplete type


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Boa noite, estou a fazer um programa em C que mexe com filas e com threads (programação concorrente) mas está-me a dar o erro: "error: dereferencing pointer to incomplete type". O código é:

/* queue_element_t */
typedef struct queue_element {
    struct _sthread *thread;
    struct queue_element *next;
} queue_element_t;

/* queue_t */
typedef struct _queue {
  queue_element_t *first;
  queue_element_t *last;
} queue_t;

void queue_print(queue_t *queue) {
queue_element_t *el = queue->first;
struct _sthread *thr;

if(el == NULL) {
for(thr = el->thread; el != NULL; el = el->next, thr = el->thread) {
	printf(" %d,%d", thr->tid, thr->quantum);

struct _sthread* queue_find_tid(queue_t *queue, int tid) {
queue_element_t *el;
struct _sthread *thr;

for(el = queue->first, thr = el->thread; el != NULL; el = el->next, thr = el->thread) {
	if(thr->tid == tid)
		return el->thread;
return NULL;

Esse erro é apontado duas vezes para a linha

printf(" %d,%d", thr->tid, thr->quantum);

e uma para a linha

if(thr->tid == tid)

Alguém me pode ajudar a detectar o que está mal nestas linhas e o que precisa de ser mudado?  :wallbash:


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