56 lines
2.3 KiB
C++
56 lines
2.3 KiB
C++
// Fig. 17.3: printtask.h
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// Function printTask defines a task to perform in a separate thread.
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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 <sstream>
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#include <string>
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#include <thread>
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// get current thread's ID as a string
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std::string id() {
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std::ostringstream out;
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out << std::this_thread::get_id();
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return out.str();
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}
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// task to perform in a separate thread
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void printTask(const std::string& name,
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std::chrono::milliseconds sleepTime) {
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// <chrono> library features we'll use for timing
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using std::chrono::steady_clock;
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using std::chrono::duration_cast;
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using std::chrono::milliseconds;
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std::cout << fmt::format("{} (ID {}) going to sleep for {} ms\n",
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name, id(), sleepTime.count());
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auto startTime{steady_clock::now()}; // get current time
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// put thread to sleep for sleepTime milliseconds
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std::this_thread::sleep_for(sleepTime);
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auto endTime{steady_clock::now()}; // get current time
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auto time{duration_cast<milliseconds>(endTime - startTime)};
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auto difference{duration_cast<milliseconds>(time - sleepTime)};
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std::cout << fmt::format("{} (ID {}) awakens after {} ms ({} + {})\n",
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name, id(), time.count(), sleepTime.count(), difference.count());
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}
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/**************************************************************************
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* (C) Copyright 1992-2021 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 authors *
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* and publisher shall not be liable in any event for incidental or *
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* consequential damages in connection with, or arising out of, the *
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* furnishing, performance, or use of these programs. *
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**************************************************************************/
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