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43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Ringbuffer definitions (ringbuffer.h)
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*
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* Copyright (c) 2018-2020 nns779
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*/
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#ifndef __RINGBUFFER_H__
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#define __RINGBUFFER_H__
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#include <linux/types.h>
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#include <linux/atomic.h>
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#include <linux/wait.h>
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struct ringbuffer {
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atomic_t state;
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atomic_t rw_count;
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atomic_t wait_count;
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wait_queue_head_t wait;
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u8 *buf;
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size_t size;
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atomic_long_t actual_size;
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atomic_long_t head; // read
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atomic_long_t tail; // write
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};
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int ringbuffer_create(struct ringbuffer **ringbuf);
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int ringbuffer_destroy(struct ringbuffer *ringbuf);
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int ringbuffer_alloc(struct ringbuffer *ringbuf, size_t size);
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int ringbuffer_free(struct ringbuffer *ringbuf);
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int ringbuffer_reset(struct ringbuffer *ringbuf);
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int ringbuffer_start(struct ringbuffer *ringbuf);
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int ringbuffer_stop(struct ringbuffer *ringbuf);
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int ringbuffer_ready_read(struct ringbuffer *ringbuf);
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int ringbuffer_read_user(struct ringbuffer *ringbuf,
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void __user *buf, size_t *len);
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int ringbuffer_write_atomic(struct ringbuffer *ringbuf,
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const void *buf, size_t *len);
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bool ringbuffer_is_readable(struct ringbuffer *ringbuf);
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bool ringbuffer_is_running(struct ringbuffer *ringbuf);
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#endif
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