threadlocalvariables.cpp

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//: C11:ThreadLocalVariables.cpp {RunByHand}
// From "Thinking in C++, Volume 2", by Bruce Eckel & Chuck Allison.
// (c) 1995-2004 MindView, Inc. All Rights Reserved.
// See source code use permissions stated in the file 'License.txt',
// distributed with the code package available at www.MindView.net.
// Automatically giving each thread its own storage.
//{L} ZThread
#include <iostream>
#include "zthread/Thread.h"
#include "zthread/Mutex.h"
#include "zthread/Guard.h"
#include "zthread/ThreadedExecutor.h"
#include "zthread/Cancelable.h"
#include "zthread/ThreadLocal.h"
#include "zthread/CountedPtr.h"
using namespace ZThread;
using namespace std;

class ThreadLocalVariables : public Cancelable {
  ThreadLocal<int> value;
  bool canceled;
  Mutex lock;
public:
  ThreadLocalVariables() : canceled(false) {
    value.set(0);
  }
  void increment() { value.set(value.get() + 1); }
  int get() { return value.get(); }
  void cancel() {
    Guard<Mutex> g(lock);
    canceled = true;
  }
  bool isCanceled() {
    Guard<Mutex> g(lock);
    return canceled;
  }
};

class Accessor : public Runnable {
  int id;
  CountedPtr<ThreadLocalVariables> tlv;
public:
  Accessor(CountedPtr<ThreadLocalVariables>& tl, int idn)
  : id(idn), tlv(tl) {}
  void run() {
    while(!tlv->isCanceled()) {
      tlv->increment();
      cout << *this << endl;
    }
  }
  friend ostream&
    operator<<(ostream& os, Accessor& a) {
    return os << "#" << a.id << ": " << a.tlv->get();
  }
};

int main() {
  cout << "Press <Enter> to quit" << endl;
  try {
    CountedPtr<ThreadLocalVariables>
      tlv(new ThreadLocalVariables);
    const int SZ = 5;
    ThreadedExecutor executor;
    for(int i = 0; i < SZ; i++)
      executor.execute(new Accessor(tlv, i));
    cin.get();
    tlv->cancel(); // All Accessors will quit
  } catch(Synchronization_Exception& e) {
    cerr << e.what() << endl;
  }
} ///:~