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[ringbuffer] 采用局部变量，防止出现资源竞争

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This commit is contained in:
Meco Man 2021-07-31 01:37:53 +08:00
parent d57caa7e15
commit 619fa4d9d8
1 changed files with 8 additions and 4 deletions
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12
components/drivers/src/ringbuffer.c
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@ -333,11 +333,15 @@ rt_size_t rt_ringbuffer_data_len(struct rt_ringbuffer *rb)
return rb->buffer_size;
case RT_RINGBUFFER_HALFFULL:
default:
if (rb->write_index > rb->read_index)
return rb->write_index - rb->read_index;
{
rt_size_t wi = rb->write_index, ri = rb->read_index;
if (wi > ri)
return wi - ri;
else
return rb->buffer_size - (rb->read_index - rb->write_index);
};
return rb->buffer_size - (ri - wi);
}
}
}
RTM_EXPORT(rt_ringbuffer_data_len);