// page04.html,v 1.10 2000/03/19 20:09:25 jcej Exp
#ifndef TASK_H
#define TASK_H
#include "ace/Task.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
/* Like the thread-pool server tutorial, we'll derive from ACE_Task<>.
Our goal here is to show off the ACE_Message_Queue and the best way
to do that is to use one to pass data between threads. The easiest
way to create threads is with ACE_Task<> */
class Task : public ACE_Task <ACE_MT_SYNCH>
{
public:
typedef ACE_Task <ACE_MT_SYNCH> inherited;
/* The constructor/destructor are simple but take care of some
necessary housekeeping. */
Task (size_t n_threads);
~Task (void);
/* open() will kick off our thread pool for us. */
int open (void * = 0);
/* Our worker method */
int svc (void);
/* All we'll do here is print a message to the user. */
int close (u_long flags = 0);
protected:
/* Just to be clever, I'll use an ACE_Barrier to cause the threads
to sync in svc() before doing any real work. */
ACE_Barrier barrier_;
size_t n_threads_;
// Number of threads in the pool.
};
#endif /* TASK_H */
The only thing here that we didn't see in the thread-pool server is the ACE_Barrier. The application logic really doesn't need it but it is a handy way to synchronize the threads at the beginning of svc(). In testing I found that if I didn't sync svc(), the first thread to get activated would tend to get all of the messages before the other threads came alive.