c-resources/CPlusPlus20ForProgrammers-m.../examples/ch17/fig17_05-06/UnsynchronizedBuffer.h

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2024-04-09 06:45:18 +00:00
// Fig. 17.5: UnsynchronizedBuffer.h
// UnsynchronizedBuffer incorrectly maintains a shared integer that is
// accessed by a producer thread and a consumer thread.
#pragma once
#include <fmt/format.h>
#include <iostream>
#include <string>
class UnsynchronizedBuffer {
public:
// place value into buffer
void put(int value) {
std::cout << fmt::format("Producer writes\t{:2d}", value);
m_buffer = value;
}
// return value from buffer
int get() const {
std::cout << fmt::format("Consumer reads\t{:2d}", m_buffer);
return m_buffer;
}
private:
int m_buffer{-1}; // shared by producer and consumer threads
};
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