void *
qb_rb_chunk_alloc(struct qb_ringbuffer_s * rb, size_t len)
{
uint32_t write_pt;
if (rb == NULL) {
errno = EINVAL;
return NULL;
}
/*
* Reclaim data if we are over writing and we need space
*/
if (rb->flags & QB_RB_FLAG_OVERWRITE) {
while (qb_rb_space_free(rb) < (len + QB_RB_CHUNK_MARGIN)) {
int rc = _rb_chunk_reclaim(rb);
if (rc != 0) {
errno = rc;
return NULL;
}
}
} else {
if (qb_rb_space_free(rb) < (len + QB_RB_CHUNK_MARGIN)) {
errno = EAGAIN;
return NULL;
}
}
write_pt = rb->shared_hdr->write_pt;
/*
* insert the chunk header
*/
rb->shared_data[write_pt] = 0;
QB_RB_CHUNK_MAGIC_SET(rb, write_pt, QB_RB_CHUNK_MAGIC_ALLOC);
/*
* return a pointer to the beginning of the chunk data
*/
return (void *)QB_RB_CHUNK_DATA_GET(rb, write_pt);
}
void *
qb_rb_chunk_alloc(struct qb_ringbuffer_s * rb, size_t len)
{
uint32_t write_pt;
if (rb == NULL) {
return NULL;
}
/*
* Reclaim data if we are over writing and we need space
*/
if (rb->flags & QB_RB_FLAG_OVERWRITE) {
while (qb_rb_space_free(rb) < (len + QB_RB_CHUNK_MARGIN)) {
qb_rb_chunk_reclaim(rb);
}
} else {
if (qb_rb_space_free(rb) < (len + QB_RB_CHUNK_MARGIN)) {
errno = EAGAIN;
return NULL;
}
}
write_pt = rb->shared_hdr->write_pt;
/*
* insert the chunk header
*/
rb->shared_data[write_pt++] = 0;
idx_step(write_pt);
rb->shared_data[write_pt++] = QB_RB_CHUNK_MAGIC;
idx_step(write_pt);
/*
* return a pointer to the beginning of the chunk data
*/
return (void *)&rb->shared_data[write_pt];
}
static void
print_header(struct qb_ringbuffer_s * rb)
{
printf("Ringbuffer: \n");
if (rb->flags & QB_RB_FLAG_OVERWRITE) {
printf(" ->OVERWRITE\n");
} else {
printf(" ->NORMAL\n");
}
printf(" ->write_pt [%d]\n", rb->shared_hdr->write_pt);
printf(" ->read_pt [%d]\n", rb->shared_hdr->read_pt);
printf(" ->size [%d words]\n", rb->shared_hdr->word_size);
#ifndef S_SPLINT_S
printf(" =>free [%zu bytes]\n", qb_rb_space_free(rb));
printf(" =>used [%zu bytes]\n", qb_rb_space_used(rb));
#endif /* S_SPLINT_S */
}
