int32_t qb_rb_chunk_commit(struct qb_ringbuffer_s * rb, size_t len) { uint32_t old_write_pt; if (rb == NULL) { return -EINVAL; } /* * commit the magic & chunk_size */ old_write_pt = rb->shared_hdr->write_pt; rb->shared_data[old_write_pt] = len; rb->shared_data[old_write_pt + 1] = QB_RB_CHUNK_MAGIC; /* * commit the new write pointer */ rb->shared_hdr->write_pt = qb_rb_chunk_step(rb, old_write_pt); DEBUG_PRINTF("%s: read: %u, write: %u (was:%u)\n", __func__, rb->shared_hdr->read_pt, rb->shared_hdr->write_pt, old_write_pt); /* * post the notification to the reader */ return rb->sem_post_fn(rb); }
static int _rb_chunk_reclaim(struct qb_ringbuffer_s * rb) { uint32_t old_read_pt; uint32_t new_read_pt; uint32_t old_chunk_size; uint32_t chunk_magic; int rc = 0; old_read_pt = rb->shared_hdr->read_pt; chunk_magic = QB_RB_CHUNK_MAGIC_GET(rb, old_read_pt); if (chunk_magic != QB_RB_CHUNK_MAGIC) { return -EINVAL; } old_chunk_size = QB_RB_CHUNK_SIZE_GET(rb, old_read_pt); new_read_pt = qb_rb_chunk_step(rb, old_read_pt); /* * clear the header */ rb->shared_data[old_read_pt] = 0; QB_RB_CHUNK_MAGIC_SET(rb, old_read_pt, QB_RB_CHUNK_MAGIC_DEAD); /* * set the new read pointer after clearing the header * to prevent a situation where a fast writer will write their * new chunk between setting the new read pointer and clearing the * header. */ rb->shared_hdr->read_pt = new_read_pt; if (rb->notifier.reclaim_fn) { rc = rb->notifier.reclaim_fn(rb->notifier.instance, old_chunk_size); if (rc < 0) { errno = -rc; qb_util_perror(LOG_WARNING, "reclaim_fn"); } } DEBUG_PRINTF("reclaim [%zd]: read: %u -> %u, write: %u\n", (rb->notifier.q_len_fn ? rb->notifier.q_len_fn(rb->notifier.instance) : 0), old_read_pt, rb->shared_hdr->read_pt, rb->shared_hdr->write_pt); return rc; }
void qb_rb_chunk_reclaim(struct qb_ringbuffer_s * rb) { uint32_t old_read_pt; if (rb == NULL || qb_rb_space_used(rb) == 0) { return; } old_read_pt = rb->shared_hdr->read_pt; qb_rb_chunk_check(rb, old_read_pt); rb->shared_hdr->read_pt = qb_rb_chunk_step(rb, old_read_pt); /* * clear the header */ rb->shared_data[old_read_pt] = 0; rb->shared_data[old_read_pt + 1] = 0; DEBUG_PRINTF("%s: read: %u (was:%u), write: %u\n", __func__, rb->shared_hdr->read_pt, old_read_pt, rb->shared_hdr->write_pt); }
int32_t qb_rb_chunk_commit(struct qb_ringbuffer_s * rb, size_t len) { uint32_t old_write_pt; if (rb == NULL) { return -EINVAL; } /* * commit the magic & chunk_size */ old_write_pt = rb->shared_hdr->write_pt; rb->shared_data[old_write_pt] = len; /* * commit the new write pointer */ rb->shared_hdr->write_pt = qb_rb_chunk_step(rb, old_write_pt); QB_RB_CHUNK_MAGIC_SET(rb, old_write_pt, QB_RB_CHUNK_MAGIC); DEBUG_PRINTF("commit [%zd] read: %u, write: %u -> %u (%u)\n", (rb->notifier.q_len_fn ? rb->notifier.q_len_fn(rb->notifier.instance) : 0), rb->shared_hdr->read_pt, old_write_pt, rb->shared_hdr->write_pt, rb->shared_hdr->word_size); /* * post the notification to the reader */ if (rb->notifier.post_fn) { return rb->notifier.post_fn(rb->notifier.instance, len); } return 0; }