55 lines
2.1 KiB
C++
55 lines
2.1 KiB
C++
// Fig. 17.4: printtask.cpp
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// Concurrently executing tasks with std::jthreads.
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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 <random>
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#include <string>
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#include <thread>
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#include <vector>
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#include "printtask.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, 5000};
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std::vector<std::jthread> threads; // stores the jthreads
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std::cout << "STARTING JTHREADS\n";
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// start two jthreads
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for (int i{1}; i < 3; ++i) {
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std::chrono::milliseconds sleepTime{ints(engine)};
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std::string name{fmt::format("Tasks {}", i)};
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// create a jthread that calls printTask, passing name and sleepTime
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// as arguments and store the jthread, so it is not destructed until
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// the vector goes out of scope at the end of main; each jthread's
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// destructor automatically joins the jthread
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threads.push_back(std::jthread{printTask, name, sleepTime});
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}
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std::cout << "\nJTHREADS STARTED\n";
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std::cout << "\nMAIN ENDS\n";
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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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