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#include <assert.h>
#include <kmalloc.h>
#include <queue.h>
#include <sched/scheduler.h>
#include <socket.h>
#include <stdio.h>
int queue_create(u32 *id, process_t *p) {
struct event_queue *q = kcalloc(1, sizeof(struct event_queue));
q->wait = 0;
q->p = p;
list_init(&q->events);
struct list *list = ¤t_task->event_queue;
list_add(list, q, id);
return 1;
}
struct event_queue *get_event_queue(u32 id) {
const struct list *list = ¤t_task->event_queue;
struct event_queue *q;
if (!list_get(list, id, (void **)&q)) {
return NULL;
}
return q;
}
int queue_add(u32 queue_id, struct event *ev, u32 size) {
struct event_queue *q = get_event_queue(queue_id);
if (!q) {
return 0;
}
for (u32 i = 0; i < size; i++) {
// TODO: Should it be a copy or could it be kept in userland to
// improve performance?
struct event *new_ev = kmalloc(sizeof(struct event));
memcpy(new_ev, ev, sizeof(struct event));
list_add(&q->events, new_ev, NULL);
}
return 1;
}
int queue_should_block(struct event_queue *q, int *is_empty) {
if (!q->wait) {
return 0;
}
*is_empty = 1;
for (int i = 0;; i++) {
struct event *ev;
if (!list_get(&q->events, i, (void **)&ev)) {
break;
}
*is_empty = 0;
if (EVENT_TYPE_FD == ev->type) {
vfs_fd_t *fd = get_vfs_fd(ev->internal_id, q->p);
if (!fd) {
kprintf("queue: Invalid fd given\n");
continue;
}
if (fd->inode->_has_data) {
if (fd->inode->_has_data(fd->inode)) {
return 0;
}
}
} else if (EVENT_TYPE_TCP_SOCKET == ev->type) {
struct TcpConnection *con = tcp_get_connection(ev->internal_id, q->p);
assert(con);
if (!ringbuffer_isempty(&con->buffer)) {
return 0;
}
}
}
return 1;
}
int queue_wait(u32 queue_id) {
struct event_queue *q = get_event_queue(queue_id);
if (!q) {
return 0;
}
q->wait = 1;
switch_task();
q->wait = 0;
return 1;
}
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