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【C】 C++无锁循环缓冲实现

作者:Jack.arain / 发布于2012/8/3/ 551

C++无锁循环缓冲实现

ifndef min
#define min(a,b) (((a) < (b)) ? (a) : (b))
#endif</div>
ifndef max
#define max(a,b) (((a) > (b)) ? (a) : (b))
#endif</div>
<div>// 无锁缓冲队列.
class circular_buffer
{
public:
 circular_buffer(int buf_size)
 : m_buffer_size(buf_size)
 , m_circle_buffer(NULL)
 , m_write_p(0)
 , m_read_p(0)
 {
 m_circle_buffer = new char[m_buffer_size];
 }
<div> ~circular_buffer()
 {
 if (m_circle_buffer)
 delete[] m_circle_buffer;
 m_circle_buffer = NULL;
 }
<div> void clear()
 {
 m_write_p = 0;
 m_read_p = 0;
 }
<div> unsigned int size()
 {
 return m_buffer_size - (m_write_p - m_read_p);
 }
<div> unsigned int used()
 {
 return m_write_p - m_read_p;
 }
<div> unsigned int put_data(char* buffer, unsigned int len)
 {
 unsigned int l;
 len = _min(len, m_buffer_size - m_write_p + m_read_p);
 /* first put the data starting from fifo->in to buffer end */
 l = _min(len, m_buffer_size - (m_write_p & (m_buffer_size - 1)));
 memcpy(m_circle_buffer + (m_write_p & (m_buffer_size - 1)), buffer, l);
 /* then put the rest (if any) at the beginning of the buffer */
 memcpy(m_circle_buffer, buffer + l, len - l);
 m_write_p += len;
 return len;
 }
<div> unsigned int get_data(char* buffer, unsigned int len)
 {
 unsigned int l; 
 len = _min(len, m_write_p - m_read_p); 
 /* first get the data from fifo->out until the end of the buffer */ 
 l = _min(len, m_buffer_size - (m_read_p & (m_buffer_size - 1))); 
 memcpy(buffer, m_circle_buffer + (m_read_p & (m_buffer_size - 1)), l); 
 /* then get the rest (if any) from the beginning of the buffer */ 
 memcpy(buffer + l, m_circle_buffer, len - l); 
 m_read_p += len; 
 return len; 
 }
<div>protected:
 inline unsigned int _max(unsigned int a, unsigned int b)
 {
 return max(a, b);
 }
<div> inline unsigned int _min(unsigned int a, unsigned int b)
 {
 return min(a, b);
 }
<div>private:
 int m_buffer_size;
 char* m_circle_buffer;
 unsigned int m_write_p;
 unsigned int m_read_p;
};
</div>

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