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// --------------------------------------------------------------------------
//
// File
// Name: WaitForEvent.cpp
// Purpose: Generic waiting for events, using an efficient method (platform dependent)
// Created: 9/3/04
//
// --------------------------------------------------------------------------
#include "Box.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <errno.h>
#include <string.h>
#include "WaitForEvent.h"
#include "MemLeakFindOn.h"
// --------------------------------------------------------------------------
//
// Function
// Name: WaitForEvent::WaitForEvent()
// Purpose: Constructor
// Created: 9/3/04
//
// --------------------------------------------------------------------------
#ifdef HAVE_KQUEUE
WaitForEvent::WaitForEvent(int Timeout)
: mKQueue(::kqueue()),
mpTimeout(0)
{
if(mKQueue == -1)
{
THROW_EXCEPTION(CommonException, CouldNotCreateKQueue)
}
// Set the choosen timeout
SetTimeout(Timeout);
}
#else
WaitForEvent::WaitForEvent(int Timeout)
: mTimeout(Timeout),
mpPollInfo(0)
{
}
#endif
// --------------------------------------------------------------------------
//
// Function
// Name: WaitForEvent::~WaitForEvent()
// Purpose: Destructor
// Created: 9/3/04
//
// --------------------------------------------------------------------------
WaitForEvent::~WaitForEvent()
{
#ifdef HAVE_KQUEUE
::close(mKQueue);
mKQueue = -1;
#else
if(mpPollInfo != 0)
{
::free(mpPollInfo);
mpPollInfo = 0;
}
#endif
}
// --------------------------------------------------------------------------
//
// Function
// Name: WaitForEvent::SetTimeout
// Purpose: Sets the timeout for future wait calls
// Created: 9/3/04
//
// --------------------------------------------------------------------------
void WaitForEvent::SetTimeout(int Timeout)
{
#ifdef HAVE_KQUEUE
// Generate timeout
if(Timeout != TimeoutInfinite)
{
mTimeout.tv_sec = Timeout / 1000;
mTimeout.tv_nsec = (Timeout % 1000) * 1000000;
}
// Infinite or not?
mpTimeout = (Timeout != TimeoutInfinite)?(&mTimeout):(NULL);
#else
mTimeout = Timeout;
#endif
}
// --------------------------------------------------------------------------
//
// Function
// Name: WaitForEvent::Wait(int)
// Purpose: Wait for an event to take place. Returns a pointer to the object
// which has been signalled, or returns 0 for the timeout condition.
// Timeout specified in milliseconds.
// Created: 9/3/04
//
// --------------------------------------------------------------------------
void *WaitForEvent::Wait()
{
#ifdef HAVE_KQUEUE
// Event return structure
struct kevent e;
::memset(&e, 0, sizeof(e));
switch(::kevent(mKQueue, NULL, 0, &e, 1, mpTimeout))
{
case 0:
// Timeout
return 0;
break;
case 1:
// Event happened!
return e.udata;
break;
default:
// Interrupted system calls aren't an error, just equivalent to a timeout
if(errno != EINTR)
{
THROW_EXCEPTION(CommonException, KEventErrorWait)
}
return 0;
break;
}
#else
// Use poll() instead.
// Need to build the structures?
if(mpPollInfo == 0)
{
// Yes...
mpPollInfo = (struct pollfd *)::malloc((sizeof(struct pollfd) * mItems.size()) + 4);
if(mpPollInfo == 0)
{
throw std::bad_alloc();
}
// Build...
for(unsigned int l = 0; l < mItems.size(); ++l)
{
mpPollInfo[l].fd = mItems[l].fd;
mpPollInfo[l].events = mItems[l].events;
mpPollInfo[l].revents = 0;
}
}
// Make sure everything is reset (don't really have to do this, but don't trust the OS)
for(unsigned int l = 0; l < mItems.size(); ++l)
{
mpPollInfo[l].revents = 0;
}
// Poll!
switch(::poll(mpPollInfo, mItems.size(), mTimeout))
{
case -1:
// Interrupted system calls aren't an error, just equivalent to a timeout
if(errno != EINTR)
{
THROW_EXCEPTION(CommonException, KEventErrorWait)
}
return 0;
break;
case 0: // timed out
return 0;
break;
default: // got some thing...
// control flows on...
break;
}
// Find the item which was ready
for(unsigned int s = 0; s < mItems.size(); ++s)
{
if(mpPollInfo[s].revents & POLLIN)
{
return mItems[s].item;
break;
}
}
#endif
return 0;
}
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