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// $Id: Semaphore.cpp 91626 2010-09-07 10:59:20Z johnnyw $
#include "ace/config-lite.h"
#if defined (ACE_HAS_THREADS)
#include "ace/OS_NS_string.h"
#include "ace/Task.h"
#include "ace/Synch.h"
// Listing 2 code/ch14
class Consumer : public ACE_Task<ACE_MT_SYNCH>
{
public:
enum { N_THREADS = 5 };
Consumer (ACE_Semaphore& psema, ACE_Semaphore& csema)
: psema_(psema), csema_(csema), exit_condition_(0)
{ }
int svc (void)
{
while (!is_closed ())
consume_item ();
return 0;
}
void consume_item ()
{
csema_.acquire ();
if (!is_closed ())
{
ACE_Message_Block *mb = 0;
this->getq (mb);
if (mb->msg_type () == ACE_Message_Block::MB_HANGUP)
{
this->shutdown ();
mb->release ();
return;
}
else
{
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%t) Consumed %d\n"),
*((int*)mb->rd_ptr ())));
mb->release();
}
psema_.release ();
}
}
//FUZZ: disable check_for_lack_ACE_OS
void shutdown (void)
{
//FUZZ: enable check_for_lack_ACE_OS
exit_condition_ = 1;
this->msg_queue ()->deactivate ();
csema_.release (N_THREADS);
}
int is_closed (void)
{
return exit_condition_;
}
private:
ACE_Semaphore& psema_;
ACE_Semaphore& csema_;
int exit_condition_;
};
// Listing 2
// Listing 1 code/ch14
class Producer : public ACE_Task_Base
{
public:
enum { MAX_PROD = 128 };
Producer (ACE_Semaphore& psema, ACE_Semaphore& csema,
Consumer &consumer)
: psema_(psema), csema_(csema), consumer_(consumer)
{ }
int svc (void)
{
for (int i = 0; i <= MAX_PROD; i++)
produce_item (i);
hang_up ();
return 0;
}
void produce_item (int item)
{
psema_.acquire ();
ACE_Message_Block *mb
= new ACE_Message_Block (sizeof (int),
ACE_Message_Block::MB_DATA);
ACE_OS::memcpy (mb->wr_ptr (), &item, sizeof item);
mb->wr_ptr (sizeof (int));
this->consumer_.putq (mb);
ACE_DEBUG ((LM_DEBUG, ACE_TEXT ("(%t) Produced %d\n"), item));
csema_.release();
}
void hang_up ()
{
psema_.acquire ();
ACE_Message_Block *mb =
new ACE_Message_Block (0, ACE_Message_Block::MB_HANGUP);
this->consumer_.putq (mb);
csema_.release ();
}
private:
ACE_Semaphore& psema_;
ACE_Semaphore& csema_;
Consumer& consumer_;
};
// Listing 1
// Listing 3 code/ch14
int ACE_TMAIN (int, ACE_TCHAR *[])
{
ACE_Semaphore psem (5);
ACE_Semaphore csem (0);
Consumer consumer (psem, csem);
Producer producer (psem, csem, consumer);
producer.activate ();
consumer.activate (THR_NEW_LWP | THR_JOINABLE,
Consumer::N_THREADS);
producer.wait ();
consumer.wait ();
return 0;
}
// Listing 3
#else
#include "ace/OS_main.h"
#include "ace/OS_NS_stdio.h"
int ACE_TMAIN (int, ACE_TCHAR *[])
{
ACE_OS::puts (ACE_TEXT ("This example requires threads."));
return 0;
}
#endif /* ACE_HAS_THREADS */
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