Re: a really simple C++ abstraction around pthread_t...

"Chris M. Thomasson" wrote


[...]


One addition I forgot to add would be creating an explict `guard' helper
object within the `active' helper object so that one can create objects and
intervene between its ctor and when it actually gets ran... Here is full
example code showing this moment:
_________________________________________________________________
/* Simple Thread Object
______________________________________________________________*/
#include <pthread.h>

extern "C" void* thread_entry(void*);

class thread_base {
  pthread_t m_tid;
  friend void* thread_entry(void*);
  virtual void on_active() = 0;

public:
  virtual ~thread_base() = 0;

  void active_run() {
    pthread_create(&m_tid, NULL, thread_entry, this);
  }

  void active_join() {
    pthread_join(m_tid, NULL);
  }
};

thread_base::~thread_base() {}

void* thread_entry(void* state) {
  reinterpret_cast<thread_base*>(state)->on_active();
  return 0;
}

template<typename T>
struct active : public T {
  struct guard {
    T& m_object;

    guard(T& object) : m_object(object) {
      m_object.active_run();
    }

    ~guard() {
      m_object.active_join();
    }
  };

  active() : T() {
    this->active_run();
  }