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#include "deque.h"
#include "smrt_arena.h"
#include <bits/pthreadtypes.h>
#include <pthread.h>
#include <semaphore.h>
#include <stdlib.h>
#include <string.h>
ez_deque_t *ez_deque_create(smrt_arena_t *arena, u64 elem_size, u64 size) {
u64 total_size = EZ_DEQUE_BASE_POS + (elem_size * size);
ez_deque_t *q = smrt_arena_push(arena, total_size, true);
q->size = size;
q->element_size_bytes = elem_size;
return q;
}
// Returns false if queue can't hold elem.
b32 ez_deque_enqueue(ez_deque_t *q, void *elem) {
if (q->occupied < q->size) {
u64 insert_pos = EZ_DEQUE_BASE_POS + (q->back * q->element_size_bytes);
memcpy((u8*)q+insert_pos, elem, q->element_size_bytes);
q->back = (q->back + 1) % q->size;
q->occupied++;
return true;
}
return false;
}
void *ez_deque_pop(ez_deque_t *q) {
if (q->occupied == 0) return NULL;
u64 pop_pos = EZ_DEQUE_BASE_POS + (q->front * q->element_size_bytes);
q->front = (q->front + 1) % q->size;
q->occupied--;
return (u8*)q + pop_pos;
}
// Sync constructs are allocated on arena
ts_deque_t ts_deque_create(smrt_arena_t *arena, ez_deque_t *q) {
pthread_mutex_t *m = smrt_arena_push(arena, sizeof(pthread_mutex_t), true);
pthread_mutex_init(m, NULL);
sem_t *s = smrt_arena_push(arena, sizeof(sem_t), true);
sem_init(s, 0, 0);
return (ts_deque_t){
.queue = q,
.write_lock = m,
.count_sem = s,
};
}
void ts_deque_destroy(ts_deque_t tsq) {
sem_destroy(tsq.count_sem);
pthread_mutex_destroy(tsq.write_lock);
}
b32 ts_deque_enqueue(ts_deque_t tsq, void *elem) {
pthread_mutex_lock(tsq.write_lock);
b32 result = ez_deque_enqueue(tsq.queue, elem);
pthread_mutex_unlock(tsq.write_lock);
if (result) sem_post(tsq.count_sem);
return result;
}
void *ts_deque_pop(ts_deque_t tsq) {
sem_wait(tsq.count_sem);
pthread_mutex_lock(tsq.write_lock);
void *result = ez_deque_pop(tsq.queue);
pthread_mutex_unlock(tsq.write_lock);
return result;
}
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