86 lines
3.0 KiB
C++
86 lines
3.0 KiB
C++
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// Fig. 17.8: SharedBufferTest.cpp
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// Concurrent threads correctly manipulating a synchronized buffer.
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#include <chrono>
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#include <fmt/format.h>
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#include <iostream>
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#include <mutex>
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#include <random>
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#include <thread>
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#include "SynchronizedBuffer.h"
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int main() {
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// set up random-number generation
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std::random_device rd;
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std::default_random_engine engine{rd()};
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std::uniform_int_distribution ints{0, 3000};
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std::mutex intsMutex;
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// lambda for synchronized random sleep time generation
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auto getSleepTime{
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[&]() {
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std::lock_guard lock{intsMutex};
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return std::chrono::milliseconds{ints(engine)};
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}
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};
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// create SynchronizedBuffer to store ints
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SynchronizedBuffer buffer;
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// lambda expression that produces the values 1-10 and sums them
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auto produce{
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[&buffer, &getSleepTime]() {
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int sum{0};
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for (int count{1}; count <= 10; ++count) {
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// get random sleep time then sleep
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std::this_thread::sleep_for(getSleepTime());
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buffer.put(count); // set value in buffer
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sum += count; // add count to sum of values produced
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}
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std::cout << "Producer done producing\nTerminating Producer\n";
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}
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};
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// lambda expression that consumes the values 1-10 and sums them
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auto consume{
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[&buffer, &getSleepTime]() {
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int sum{0};
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for (int count{1}; count <= 10; ++count) {
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// get random sleep time then sleep
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std::this_thread::sleep_for(getSleepTime());
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sum += buffer.get(); // get buffer value and add to sum
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}
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std::cout << fmt::format("\n{} {}\n{}\n",
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"Consumer read values totaling", sum, "Terminating Consumer");
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}
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};
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std::cout << fmt::format("{:<40}{}\t\t{}\n{:<40}{}\t\t{}\n\n",
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"Operation", "Buffer", "Occupied",
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"---------", "------", "--------");
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std::jthread producer{produce}; // start producer thread
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std::jthread consumer{consume}; // start consumer thread
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}
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/************************************************************************
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* (C) Copyright 1992-2022 by Deitel & Associates, Inc. and *
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* Pearson Education, Inc. All Rights Reserved. *
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* *
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* DISCLAIMER: The authors and publisher of this book have used their *
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* best efforts in preparing the book. These efforts include the *
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* development, research, and testing of the theories and programs *
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* to determine their effectiveness. The authors and publisher make *
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* no warranty of any kind, expressed or implied, with regard to these *
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* programs or to the documentation contained in these books. The *
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* authors and publisher shall not be liable in any event for *
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* incidental or consequential damages in connection with, or arising *
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* out of, the furnishing, performance, or use of these programs. *
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***********************************************************************/
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