62 lines
1.3 KiB
C
62 lines
1.3 KiB
C
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#include "lnm/loop.h"
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lnm_err lnm_loop_queue_init(lnm_loop_queue **out, size_t cap) {
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lnm_loop_conn **arr = malloc(cap * sizeof(lnm_loop_conn *));
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if (arr == NULL) {
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return lnm_err_failed_alloc;
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}
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lnm_loop_queue *q = calloc(1, sizeof(lnm_loop_queue));
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if (q == NULL) {
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free(arr);
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return lnm_err_failed_alloc;
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}
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q->buf.arr = arr;
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q->buf.len = cap;
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pthread_mutex_init(&q->mutex, NULL);
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pthread_cond_init(&q->cond, NULL);
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*out = q;
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return lnm_err_ok;
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}
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void lnm_loop_queue_push(lnm_loop_queue *q, lnm_loop_conn *conn) {
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pthread_mutex_lock(&q->mutex);
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while (q->tail == q->head) {
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pthread_cond_wait(&q->cond, &q->mutex);
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}
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q->buf.arr[q->tail] = conn;
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// Make sure the index wraps around
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q->tail = (q->tail + 1) % q->buf.len;
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// Unlock mutex and signal to waiting threads
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pthread_mutex_unlock(&q->mutex);
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pthread_cond_signal(&q->cond);
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}
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lnm_loop_conn *lnm_loop_queue_pop(lnm_loop_queue *q) {
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pthread_mutex_lock(&q->mutex);
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while (q->tail == q->head) {
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pthread_cond_wait(&q->cond, &q->mutex);
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}
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lnm_loop_conn *out = q->buf.arr[q->head];
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q->head = (q->head + 1) % q->buf.len;
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// Unlock mutex and signal to waiting threads
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pthread_mutex_unlock(&q->mutex);
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pthread_cond_signal(&q->cond);
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return out;
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}
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