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// $Id: Condition_Variables.cpp 91633 2010-09-07 14:27:13Z johnnyw $
#include "ace/config-lite.h"
#if defined (ACE_HAS_THREADS)
#include "ace/Task.h"
#include "ace/Synch.h"
#include "ace/Condition_T.h"
// Listing 1 code/ch12
class HA_Device_Repository
{
public:
HA_Device_Repository() : owner_(0)
{ }
int is_free (void)
{ return (this->owner_ == 0); }
int is_owner (ACE_Task_Base* tb)
{ return (this->owner_ == tb); }
ACE_Task_Base *get_owner (void)
{ return this->owner_; }
void set_owner (ACE_Task_Base *owner)
{ this->owner_ = owner; }
int update_device (int device_id);
private:
ACE_Task_Base * owner_;
};
// Listing 1
class HA_CommandHandler : public ACE_Task_Base
{
public:
enum {NUM_USES = 10};
HA_CommandHandler (HA_Device_Repository& rep,
ACE_Condition<ACE_Thread_Mutex> &wait,
ACE_Thread_Mutex& mutex)
: rep_(rep), waitCond_(wait), mutex_(mutex)
{ }
virtual int svc (void);
private:
HA_Device_Repository &rep_;
ACE_Condition<ACE_Thread_Mutex> &waitCond_;
ACE_Thread_Mutex &mutex_;
};
// Listing 2 code/ch12
int
HA_CommandHandler::svc (void)
{
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("(%t) Handler Thread running\n")));
for (int i = 0; i < NUM_USES; i++)
{
this->mutex_.acquire ();
while (!this->rep_.is_free ())
this->waitCond_.wait ();
this->rep_.set_owner (this);
this->mutex_.release ();
this->rep_.update_device (i);
ACE_ASSERT (this->rep_.is_owner (this));
this->rep_.set_owner (0);
this->waitCond_.signal ();
}
return 0;
}
// Listing 2
int
HA_Device_Repository::update_device (int device_id)
{
ACE_DEBUG ((LM_DEBUG, ACE_TEXT ("(%t) Updating device %d\n"),
device_id));
ACE_OS::sleep (1);
return 0;
}
// Listing 3 code/ch12
int ACE_TMAIN (int, ACE_TCHAR *[])
{
HA_Device_Repository rep;
ACE_Thread_Mutex rep_mutex;
//FUZZ: disable check_for_lack_ACE_OS
ACE_Condition<ACE_Thread_Mutex> wait (rep_mutex);
//FUZZ: enable check_for_lack_ACE_OS
HA_CommandHandler handler1 (rep, wait, rep_mutex);
HA_CommandHandler handler2 (rep, wait, rep_mutex);
handler1.activate ();
handler2.activate ();
handler1.wait ();
handler2.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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