twobuffer

#pragma once
#include <stdio.h>
#include <iostream>
#include <string>
#include <thread>
#include <mutex>

class CTwoBuffer
{
public:
    CTwoBuffer()
        :buffer1(nullptr)
        , buffer2(nullptr)
        , bufferRead(nullptr)
        , bufferWrite(nullptr)
        , bufferSize(0)
        , bufferReadIndex(0)
        , bufferWriteIndex(0)
        , bytesCanRead(0)
    {

    };
    void Init(int buffSize = 1024 * 1024)
    {
        printf("block init--%d-->", buffSize);
        buffer1 = new unsigned char[buffSize];
        buffer2 = new unsigned char[buffSize];
        bufferRead = buffer1;
        bufferWrite= buffer2;

        if (!buffer1||!buffer2) return;
        this->bufferSize = buffSize;
    }

    void Write(unsigned char* src, int size)
    {
      //  printf("want write %d ,%d %d, bsize %d \n", size, readIndex, writeIndex, bufferSize);
        if (!src || size == 0) return;
        std::lock_guard<std::mutex> lk(lock);
        if (size >= bufferSize - bufferWriteIndex) {
            std::this_thread::sleep_for(std::chrono::microseconds(50));
            printf("buffer now is full  %d,%d,%d!", size, bufferSize, bytesCanRead);

            //遗弃和交换

            return;
        }
        memcpy(bufferWrite + bufferWriteIndex, src, size);
        bufferWriteIndex += size;

    }

    int Read(uint8_t* dst, int size)
    {
        std::this_thread::sleep_for(std::chrono::microseconds(80));
        //read小于则等待
        //就看这两个的--
        //printf("want Read %d ,%d %d \n", size, readIndex, writeIndex);
        if (!dst || size == 0) return 0;
        std::lock_guard<std::mutex> lk(lock);
        //必须50k缓冲
        if (size > bufferSize - bufferReadIndex) {
            std::this_thread::sleep_for(std::chrono::microseconds(50));
            printf("Buffer is empty!---->");

            //翻转等
            return 0;
        }

        memcpy(dst, bufferRead, size);
        bufferReadIndex += size;
        return size;
    }


    private:
        unsigned char* buffer1;
        unsigned char* buffer2;
        unsigned char* bufferRead;
        unsigned char* bufferWrite;
        int bufferSize;
        int bufferReadIndex;
        int bufferWriteIndex;
        int bytesCanRead;
        std::mutex lock;

};

标签：std,twobuffer,int,unsigned,char,bufferSize,size
来源： https://www.cnblogs.com/cnchengv/p/15725186.html