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ringbuffer: simplify the API

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Use absolute indexes that we let wrap around. We can then easily detect
how much we under of overflowed by using serial number arithmetic.
Remove the Areas, we can trivially compute this ourselves, move the
logic in read/write_data.
This commit is contained in:
Wim Taymans 2017-04-20 11:25:24 +02:00
parent 90ea120d3c
commit 0b508db9fc
6 changed files with 107 additions and 138 deletions
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37
pinos/client/loop.c
View file

@ -182,32 +182,45 @@ loop_invoke (SpaLoop *loop,
{
PinosLoopImpl *impl = SPA_CONTAINER_OF (loop, PinosLoopImpl, loop);
bool in_thread = pthread_equal (impl->thread, pthread_self());
SpaRingbufferArea areas[2];
InvokeItem *item;
SpaResult res;
if (in_thread) {
res = func (loop, false, seq, size, data, user_data);
} else {
spa_ringbuffer_get_write_areas (&impl->buffer, areas);
if (areas[0].len < sizeof (InvokeItem)) {
pinos_log_warn ("data-loop %p: queue full", impl);
int32_t filled, avail;
uint32_t offset, l0;
filled = spa_ringbuffer_get_write_index (&impl->buffer, &offset);
if (filled < 0 || filled > impl->buffer.size) {
pinos_log_warn ("data-loop %p: queue xrun %d", impl, filled);
return SPA_RESULT_ERROR;
}
item = SPA_MEMBER (impl->buffer_data, areas[0].offset, InvokeItem);
avail = impl->buffer.size - filled;
if (avail < sizeof (InvokeItem)) {
pinos_log_warn ("data-loop %p: queue full %d", impl, avail);
return SPA_RESULT_ERROR;
}
offset &= impl->buffer.mask;
l0 = offset + avail;
if (l0 > impl->buffer.size)
l0 = impl->buffer.size - l0;
item = SPA_MEMBER (impl->buffer_data, offset, InvokeItem);
item->func = func;
item->seq = seq;
item->size = size;
item->user_data = user_data;
if (areas[0].len > sizeof (InvokeItem) + size) {
if (l0 > sizeof (InvokeItem) + size) {
item->data = SPA_MEMBER (item, sizeof (InvokeItem), void);
item->item_size = sizeof (InvokeItem) + size;
if (areas[0].len < sizeof (InvokeItem) + item->item_size)
item->item_size = areas[0].len;
if (l0 < sizeof (InvokeItem) + item->item_size)
item->item_size = l0;
} else {
item->data = SPA_MEMBER (impl->buffer_data, areas[1].offset, void);
item->item_size = areas[0].len + 1 + size;
item->data = impl->buffer_data;
item->item_size = l0 + 1 + size;
}
memcpy (item->data, data, size);
@ -231,8 +244,8 @@ event_func (SpaLoopUtils *utils,
PinosLoopImpl *impl = data;
uint32_t offset;
while (spa_ringbuffer_get_read_offset (&impl->buffer, &offset) > 0) {
InvokeItem *item = SPA_MEMBER (impl->buffer_data, offset, InvokeItem);
while (spa_ringbuffer_get_read_index (&impl->buffer, &offset) > 0) {
InvokeItem *item = SPA_MEMBER (impl->buffer_data, offset & impl->buffer.mask, InvokeItem);
item->func (impl->this.loop, true, item->seq, item->size, item->data, item->user_data);
spa_ringbuffer_read_advance (&impl->buffer, item->item_size);
}