test-con-queue.C

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/* Aleph-w
 
     / \  | | ___ _ __ | |__      __      __
    / _ \ | |/ _ \ '_ \| '_ \ ____\ \ /\ / / Data structures & Algorithms
   / ___ \| |  __/ |_) | | | |_____\ V  V /  version 1.9c
  /_/   \_\_|\___| .__/|_| |_|      \_/\_/   https://github.com/lrleon/Aleph-w
                 |_|         
 
  This file is part of Aleph-w library
 
  Copyright (c) 2002-2018 Leandro Rabindranath Leon 
 
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
 
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
 
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
*/
 
# include <iostream>
# include <cerrno>
# include <chrono>
# include <thread>
# include <q-consumer-threads.H>
 
using namespace std;
 
static constexpr size_t WORK_DELAY_MS = 10;
 
struct Event1 : QueueTheadsPool<int>::Event
{
  void run() override
  {
    // cout << "Event 1 " << item << endl;
    this_thread::sleep_for(chrono::milliseconds(WORK_DELAY_MS));
    increment_count(); 
  }
};
 
struct Event2 : QueueTheadsPool<int>::Event
{
  void run() override
  {
    // cout << "Event 2 " << item << endl;
    this_thread::sleep_for(chrono::milliseconds(WORK_DELAY_MS));
    increment_count(); 
  }
};
 
int main(int argc, char *argv[])
{
  if (argc == 1)
    {
      cout << "test-con-queue -- demonstrates QueueTheadsPool concurrent processing\n"
           << "\n"
           << "Creates a pool of worker threads backed by a shared queue. Each thread\n"
           << "runs one of two event types (Event1 / Event2), both of which sleep for\n"
           << WORK_DELAY_MS << " ms to simulate work. The test enqueues items, lets workers\n"
           << "run for a while, then suspends, sleeps, resumes, and finally shuts down.\n"
           << "\n"
           << "Usage:\n"
           << "  " << argv[0] << " <num_threads> <num_items> <secs>\n"
           << "\n"
           << "Arguments:\n"
           << "  num_threads  Number of worker threads to create (positive integer)\n"
           << "  num_items    Number of integer items to enqueue\n"
           << "  secs         Seconds to let workers run in each active phase\n"
           << "\n"
           << "Example:\n"
           << "  " << argv[0] << " 4 100 3\n"
           << "      Creates 4 threads, enqueues 100 items, runs for 3 s, suspends,\n"
           << "      sleeps 5 s, resumes for another 3 s, then shuts down.\n";
      return 0;
    }
 
  if (argc < 4)
    {
      cerr << "Usage: " << argv[0] << " <num_threads> <num_items> <secs>" << endl;
      return 1;
    }
 
  char * endptr = nullptr;
  errno = 0;
  if (argv[1][0] == '-')
    {
      cerr << "Invalid num_threads: " << argv[1] << endl;
      return 1;
    }
  const size_t num_threads = strtoul(argv[1], &endptr, 10);
  if (errno != 0 or endptr == argv[1] or *endptr != '\0' or num_threads == 0)
    {
      cerr << "Invalid num_threads: " << argv[1] << endl;
      return 1;
    }
 
  if (argv[2][0] == '-')
    {
      cerr << "Invalid num_items: " << argv[2] << endl;
      return 1;
    }
  const size_t num_items = strtoul(argv[2], &endptr, 10);
  if (errno != 0 or endptr == argv[2] or *endptr != '\0')
    {
      cerr << "Invalid num_items: " << argv[2] << endl;
      return 1;
    }
 
  if (argv[3][0] == '-')
    {
      cerr << "Invalid secs: " << argv[3] << endl;
      return 1;
    }
  const size_t secs = strtoul(argv[3], &endptr, 10);
  if (errno != 0 or endptr == argv[3] or *endptr != '\0')
    {
      cerr << "Invalid secs: " << argv[3] << endl;
      return 1;
    }
 
  QueueTheadsPool<int> qpool;
  DynList<QueueTheadsPool<int>::Event*> event_list;
  for (size_t i = 0; i < num_threads; ++i)
    {
      QueueTheadsPool<int>::Event * ptr = nullptr;
      if (i % 2 == 0)
  qpool.create_thread(ptr = new Event1);
      else
  qpool.create_thread(ptr = new Event2);
      event_list.append(ptr);
    }
 
  cout << "Inserting " << num_items << " to the queue" << endl;
  for (size_t i = 0; i < num_items; ++i)
    {
      cout << "Inserting " << i << endl;
      qpool.put(i);
    }
  cout << "Done" << endl
       << endl
       << "Resuming ... " << endl;
  qpool.resume();
  
  cout << endl
       << "Sleeping for " << secs << " seconds" << endl;
  this_thread::sleep_for(chrono::seconds(secs));
  cout << endl 
       << "Done" << endl
       << endl
       << "List of event counters" << endl;
  event_list.for_each([] (auto e) 
    {
      cout << "    Event count = " << e->get_count() << endl; 
    });
 
  cout << "done" << endl
       << endl
       << "Suspending (cooperative: in-flight tasks continue in run())" << endl;
  qpool.suspend();
  cout << "Done" << endl
       << endl
       << "Sleeping for 5 secs" << endl;
  this_thread::sleep_for(chrono::seconds(5));
  cout << "done" << endl
       << endl
       << "Resuming while other " << secs << " seconds" << endl
       << endl;
  qpool.resume();
    this_thread::sleep_for(chrono::seconds(secs));
  cout << endl 
       << "Done" << endl
       << endl
       << "List of event counters" << endl;
  event_list.for_each([] (auto e) 
    {
      cout << "    Event count = " << e->get_count() << endl; 
    });
 
  cout << "done" << endl
       << endl
       << "Shutdown" << endl;
  qpool.shutdown();
  cout << "Done" << endl;
 
  return 0;
}