546f4e5e05
a given flat buffer. * Added ring_buffer_peek() for random position reading from the ring buffer without changing its state. git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@35813 a95241bf-73f2-0310-859d-f6bbb57e9c96
50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
/*
|
|
* Copyright 2005, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
|
|
* Distributed under the terms of the MIT License.
|
|
*/
|
|
#ifndef RING_BUFFER_H
|
|
#define RING_BUFFER_H
|
|
|
|
|
|
#include <OS.h>
|
|
|
|
|
|
struct ring_buffer {
|
|
int32 first;
|
|
int32 in;
|
|
int32 size;
|
|
uint8 buffer[0];
|
|
};
|
|
|
|
|
|
// flags for create_ring_buffer_etc()
|
|
#define RING_BUFFER_INIT_FROM_BUFFER 0x01
|
|
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
struct ring_buffer *create_ring_buffer(size_t size);
|
|
struct ring_buffer *create_ring_buffer_etc(void *memory, size_t size,
|
|
uint32 flags);
|
|
void delete_ring_buffer(struct ring_buffer *buffer);
|
|
|
|
void ring_buffer_clear(struct ring_buffer *buffer);
|
|
size_t ring_buffer_readable(struct ring_buffer *buffer);
|
|
size_t ring_buffer_writable(struct ring_buffer *buffer);
|
|
void ring_buffer_flush(struct ring_buffer *buffer, size_t bytes);
|
|
size_t ring_buffer_read(struct ring_buffer *buffer, uint8 *data, ssize_t length);
|
|
size_t ring_buffer_write(struct ring_buffer *buffer, const uint8 *data, ssize_t length);
|
|
ssize_t ring_buffer_user_read(struct ring_buffer *buffer, uint8 *data, ssize_t length);
|
|
ssize_t ring_buffer_user_write(struct ring_buffer *buffer, const uint8 *data, ssize_t length);
|
|
size_t ring_buffer_peek(struct ring_buffer *buffer, size_t offset, void *data,
|
|
size_t length);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
|
|
#endif /* RING_BUFFER_H */
|