threeeye
bc1d038eac
Squashed backup commit (no shallow-clone history issues) of xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2 branch, upstream commit 9eece662e) plus all fixes applied to get everpal_defconfig building clean against a modern (GCC 15.2.0) toolchain -- see the previous commit message on the lineage-23.2 branch (also in this repo history is not available here since this is a squashed snapshot; full incremental history lives in the local DL380 checkout and the upstream GitHub remote). Upstream: https://github.com/xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2)
39 lines
1.1 KiB
C
39 lines
1.1 KiB
C
/*
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* reader shoule NEVER block !!!, if no data is avaliable, just return zero
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* writer will block if there is no space, and wakend up by reader or force exit
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* there is 1 writer and 1 reader for each buffer, so no lock is used
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* writer shoule read rd_index to check if free size is enought, and then fill this buffer update wr_index
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* reader shoule read wr_index to check if avaliable size is enought, and then read the buffer and update rd_index
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* empty: wr_index==rd_index
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* full: (wr_index +1) % BUFFER_SIZE == rd_index
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* total avaliable size is BUFFER_SIZE -1
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*/
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#ifndef _RINGBUFFER_H_
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#define _RINGBUFFER_H_
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#include <linux/timer.h>
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#include <linux/workqueue.h>
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#include <linux/mutex.h>
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#include <linux/atomic.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#define MIN(x, y) ((x) < (y) ? (x) : (y))
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int write_rb(const char *data, int32_t size);
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int read_rb(char *data, int32_t size) ;
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int get_rb_free_size(void);
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int get_rb_max_size(void);
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void rb_force_exit(void);
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void rb_end(void);
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int rb_shoule_exit(void);
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int create_rb(void) ;
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void rb_init(void);
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int release_rb(void);
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int get_rb_avalible_size(void);
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#endif
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