Add a lockless ringbuffer

Largely copied from JACK, it's extended to work with user-specified element
sizes instead of bytes. This is necessary to be able to work with 6- and 7-
channel output modes.

1 files changed, 19 insertions, 0 deletions

diff --git a/OpenAL32/Include/alMain.h b/OpenAL32/Include/alMain.h
index 115edb03..9dcaa29b 100644
--- a/OpenAL32/Include/alMain.h
+++ b/OpenAL32/Include/alMain.h
@@ -847,6 +847,25 @@ ALsizei RingBufferSize(RingBuffer *ring);
 void WriteRingBuffer(RingBuffer *ring, const ALubyte *data, ALsizei len);
 void ReadRingBuffer(RingBuffer *ring, ALubyte *data, ALsizei len);
 
+typedef struct ll_ringbuffer ll_ringbuffer_t;
+typedef struct ll_ringbuffer_data {
+    char *buf;
+    size_t len;
+} ll_ringbuffer_data_t;
+ll_ringbuffer_t *ll_ringbuffer_create(size_t sz, size_t elem_sz);
+void ll_ringbuffer_free(ll_ringbuffer_t *rb);
+void ll_ringbuffer_get_read_vector(const ll_ringbuffer_t *rb, ll_ringbuffer_data_t *vec);
+void ll_ringbuffer_get_write_vector(const ll_ringbuffer_t *rb, ll_ringbuffer_data_t *vec);
+size_t ll_ringbuffer_read(ll_ringbuffer_t *rb, char *dest, size_t cnt);
+size_t ll_ringbuffer_peek(ll_ringbuffer_t *rb, char *dest, size_t cnt);
+void ll_ringbuffer_read_advance(ll_ringbuffer_t *rb, size_t cnt);
+size_t ll_ringbuffer_read_space(const ll_ringbuffer_t *rb);
+int ll_ringbuffer_mlock(ll_ringbuffer_t *rb);
+void ll_ringbuffer_reset(ll_ringbuffer_t *rb);
+size_t ll_ringbuffer_write(ll_ringbuffer_t *rb, const char *src, size_t cnt);
+void ll_ringbuffer_write_advance(ll_ringbuffer_t *rb, size_t cnt);
+size_t ll_ringbuffer_write_space(const ll_ringbuffer_t *rb);
+
 void ReadALConfig(void);
 void FreeALConfig(void);
 int ConfigValueExists(const char *blockName, const char *keyName);