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kernel: implement ring-buffer data structure

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max 🍓
2023-05-10 20:30:16 +01:00
parent 63f27adb1b
commit 422d4fb375
3 changed files with 209 additions and 0 deletions
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35
include/socks/ringbuffer.h Normal file
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@@ -0,0 +1,35 @@
#ifndef SOCKS_RINGBUFFER_H_
#define SOCKS_RINGBUFFER_H_
#include <socks/locks.h>
#include <socks/sched.h>
struct ringbuffer {
unsigned char *r_buffer;
size_t r_write_ptr;
size_t r_read_ptr;
size_t r_size;
spin_lock_t r_lock;
struct waitqueue r_wait_readers;
struct waitqueue r_wait_writers;
};
enum ringbuffer_flags {
RB_NORMAL = 0x00u,
RB_NOBLOCK = 0x01u,
};
extern struct ringbuffer *ringbuffer_create(size_t size);
extern void ringbuffer_destroy(struct ringbuffer *buf);
extern kern_status_t ringbuffer_init(struct ringbuffer *buf, size_t size);
extern kern_status_t ringbuffer_deinit(struct ringbuffer *buf);
extern size_t ringbuffer_unread(struct ringbuffer *buf);
extern size_t ringbuffer_avail(struct ringbuffer *buf);
extern size_t ringbuffer_read(struct ringbuffer *buf, size_t size, void *buffer, enum ringbuffer_flags flags);
extern size_t ringbuffer_write(struct ringbuffer *buf, size_t size, const void *buffer, enum ringbuffer_flags flags);
extern int ringbuffer_write_would_block(struct ringbuffer *buf);
#endif

1
include/socks/status.h
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@@ -10,6 +10,7 @@ typedef unsigned int kern_status_t;
#define KERN_UNSUPPORTED (4)
#define KERN_NO_MEMORY (5)
#define KERN_NO_ENTRY (6)
#define KERN_WOULD_BLOCK (7)
extern const char *kern_status_string(kern_status_t status);