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#include "ace/Message_Queue.h"
#include "ace/Message_Queue_NT.h"
#include "ace/Log_Category.h"
#if !defined (__ACE_INLINE__)
#include "ace/Message_Queue_NT.inl"
#endif /* __ACE_INLINE__ */
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
#if defined (ACE_HAS_WIN32_OVERLAPPED_IO)
ACE_Message_Queue_NT::ACE_Message_Queue_NT (DWORD max_threads)
: max_cthrs_ (max_threads),
cur_thrs_ (0),
cur_bytes_ (0),
cur_length_ (0),
cur_count_ (0),
completion_port_ (ACE_INVALID_HANDLE)
{
ACE_TRACE ("ACE_Message_Queue_NT::ACE_Message_Queue_NT");
this->open (max_threads);
}
int
ACE_Message_Queue_NT::open (DWORD max_threads)
{
ACE_TRACE ("ACE_Message_Queue_NT::open");
this->max_cthrs_ = max_threads;
this->state_ = ACE_Message_Queue_Base::ACTIVATED;
this->completion_port_ = ::CreateIoCompletionPort (ACE_INVALID_HANDLE,
0,
ACE_Message_Queue_Base::ACTIVATED,
max_threads);
if (this->completion_port_ == 0)
this->state_ = ACE_Message_Queue_Base::DEACTIVATED;
return (this->completion_port_ == 0 ? -1 : 0);
}
int
ACE_Message_Queue_NT::close (void)
{
ACE_TRACE ("ACE_Message_Queue_NT::close");
ACE_GUARD_RETURN (ACE_SYNCH_MUTEX, ace_mon, this->lock_, -1);
this->deactivate ();
return (::CloseHandle (this->completion_port_) ? 0 : -1 );
}
ACE_Message_Queue_NT::~ACE_Message_Queue_NT (void)
{
ACE_TRACE ("ACE_Message_Queue_NT::~ACE_Message_Queue_NT");
this->close ();
}
int
ACE_Message_Queue_NT::enqueue (ACE_Message_Block *new_item,
ACE_Time_Value *)
{
ACE_TRACE ("ACE_Message_Queue_NT::enqueue");
ACE_GUARD_RETURN (ACE_SYNCH_MUTEX, ace_mon, this->lock_, -1);
if (this->state_ != ACE_Message_Queue_Base::DEACTIVATED)
{
size_t const msize = new_item->total_size ();
size_t const mlength = new_item->total_length ();
// Note - we send ACTIVATED in the 3rd arg to tell the completion
// routine it's _NOT_ being woken up because of deactivate().
ULONG_PTR state_to_post;
state_to_post = ACE_Message_Queue_Base::ACTIVATED;
if (::PostQueuedCompletionStatus (this->completion_port_,
static_cast<DWORD> (msize),
state_to_post,
reinterpret_cast<LPOVERLAPPED> (new_item)))
{
// Update the states once I succeed.
this->cur_bytes_ += msize;
this->cur_length_ += mlength;
return ACE_Utils::truncate_cast<int> (++this->cur_count_);
}
}
else
errno = ESHUTDOWN;
// Fail to enqueue the message.
return -1;
}
int
ACE_Message_Queue_NT::dequeue (ACE_Message_Block *&first_item,
ACE_Time_Value *timeout)
{
ACE_TRACE ("ACE_Message_Queue_NT::dequeue_head");
{
ACE_GUARD_RETURN (ACE_SYNCH_MUTEX, ace_mon, this->lock_, -1);
// Make sure the MQ is not deactivated before proceeding.
if (this->state_ == ACE_Message_Queue_Base::DEACTIVATED)
{
errno = ESHUTDOWN; // Operation on deactivated MQ not allowed.
return -1;
}
else
++this->cur_thrs_; // Increase the waiting thread count.
}
ULONG_PTR queue_state;
DWORD msize;
// Get a message from the completion port.
int retv = ::GetQueuedCompletionStatus (this->completion_port_,
&msize,
&queue_state,
reinterpret_cast<LPOVERLAPPED *> (&first_item),
(timeout == 0 ? INFINITE : timeout->msec ()));
{
ACE_GUARD_RETURN (ACE_SYNCH_MUTEX, ace_mon, this->lock_, -1);
--this->cur_thrs_; // Decrease waiting thread count.
if (retv)
{
if (queue_state == ACE_Message_Queue_Base::ACTIVATED)
{ // Really get a valid MB from the queue.
--this->cur_count_;
this->cur_bytes_ -= msize;
this->cur_length_ -= first_item->total_length ();
return ACE_Utils::truncate_cast<int> (this->cur_count_);
}
else // Woken up by deactivate () or pulse ().
errno = ESHUTDOWN;
}
}
return -1;
}
int
ACE_Message_Queue_NT::deactivate (void)
{
ACE_TRACE ("ACE_Message_Queue_NT::deactivate");
ACE_GUARD_RETURN (ACE_SYNCH_MUTEX, ace_mon, this->lock_, -1);
int const previous_state = this->state_;
if (previous_state != ACE_Message_Queue_Base::DEACTIVATED)
{
this->state_ = ACE_Message_Queue_Base::DEACTIVATED;
// Get the number of shutdown messages necessary to wake up all
// waiting threads.
DWORD cntr =
this->cur_thrs_ - static_cast<DWORD> (this->cur_count_);
while (cntr-- > 0)
::PostQueuedCompletionStatus (this->completion_port_,
0,
this->state_,
0);
}
return previous_state;
}
int
ACE_Message_Queue_NT::activate (void)
{
ACE_TRACE ("ACE_Message_Queue_NT::activate");
ACE_GUARD_RETURN (ACE_SYNCH_MUTEX, ace_mon, this->lock_, -1);
int const previous_status = this->state_;
this->state_ = ACE_Message_Queue_Base::ACTIVATED;
return previous_status;
}
int
ACE_Message_Queue_NT::pulse (void)
{
ACE_TRACE ("ACE_Message_Queue_NT::pulse");
ACE_GUARD_RETURN (ACE_SYNCH_MUTEX, ace_mon, this->lock_, -1);
int const previous_state = this->state_;
if (previous_state != ACE_Message_Queue_Base::DEACTIVATED)
{
this->state_ = ACE_Message_Queue_Base::PULSED;
// Get the number of shutdown messages necessary to wake up all
// waiting threads.
DWORD cntr =
this->cur_thrs_ - static_cast<DWORD> (this->cur_count_);
while (cntr-- > 0)
::PostQueuedCompletionStatus (this->completion_port_,
0,
this->state_,
0);
}
return previous_state;
}
void
ACE_Message_Queue_NT::dump () const
{
#if defined (ACE_HAS_DUMP)
ACE_TRACE ("ACE_Message_Queue_NT::dump");
ACELIB_DEBUG ((LM_DEBUG, ACE_BEGIN_DUMP, this));
switch (this->state_)
{
case ACE_Message_Queue_Base::ACTIVATED:
ACELIB_DEBUG ((LM_DEBUG,
ACE_TEXT ("state = ACTIVATED\n")));
break;
case ACE_Message_Queue_Base::DEACTIVATED:
ACELIB_DEBUG ((LM_DEBUG,
ACE_TEXT ("state = DEACTIVATED\n")));
break;
case ACE_Message_Queue_Base::PULSED:
ACELIB_DEBUG ((LM_DEBUG,
ACE_TEXT ("state = PULSED\n")));
break;
}
ACELIB_DEBUG ((LM_DEBUG,
ACE_TEXT ("max_cthrs_ = %d\n")
ACE_TEXT ("cur_thrs_ = %d\n")
ACE_TEXT ("cur_bytes = %d\n")
ACE_TEXT ("cur_length = %d\n")
ACE_TEXT ("cur_count = %d\n")
ACE_TEXT ("completion_port_ = %x\n"),
this->max_cthrs_,
this->cur_thrs_,
this->cur_bytes_,
this->cur_length_,
this->cur_count_,
this->completion_port_));
ACELIB_DEBUG ((LM_DEBUG, ACE_END_DUMP));
#endif /* ACE_HAS_DUMP */
}
#endif /* ACE_HAS_WIN32_OVERLAPPED_IO */
ACE_END_VERSIONED_NAMESPACE_DECL
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